MFRI INC
S-3, 1998-01-23
INDUSTRIAL & COMMERCIAL FANS & BLOWERS & AIR PURIFING EQUIP
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AS  FILED  WITH  THE  SECURITIES  AND  EXCHANGE COMMISSION ON JANUARY 22, 1998.
                              REGISTRATION NO. 333-______




                          SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C.  20549




                                   FORM S-3
                             REGISTRATION STATEMENT
                                    UNDER
                           THE SECURITIES ACT OF 1933




                                 MFRI, INC.
             (Exact name of registrant as specified in its charter)
<TABLE>
<CAPTION>
   <S>                                            <C>  
           DELAWARE                                   36-3922969
   (State or other jurisdictiction                   (IRS Employer
 of incorporation or organization)                  Identification No.)

</TABLE>


                              7720 LEHIGH AVENUE
                            NILES, ILLINOIS 60714
                                (847) 966-1000
                 (Address, including ZIP code, and telephone number,
         including  area  code, of  registrant's  principal  executive offices)

                                  DAVID UNGER
                        CHAIRMAN OF THE BOARD OF DIRECTORS
                                   MFRI, INC.
                                7720 LEHIGH AVENUE
                              NILES, ILLINOIS 60714
                                 (847) 966-1000
                     (Name, address, including ZIP Code, and
        telephone  number,   including  area  code,  of  agent  for service)




                                   COPIES TO:

                               HAL M. BROWN, ESQ.
                                RUDNICK & WOLFE
                         203 NORTH LASALLE STREET, SUITE 1800
                           CHICAGO, ILLINOIS  60601
                                 (312) 368-4012
                           (312) 236-7516(TELECOPIER)




    APPROXIMATE DATE OF COMMENCEMENT  OF  PROPOSED  SALE  TO  THE PUBLIC:
    FROM  TIME  TO  TIME AFTER THE EFFECTIVE DATE OF THIS REGISTRATION 
    STATEMENT.




   If the only securities being  registered  on  this  form  are  being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.
                         <square>
   If  any of the securities being registered on this form are being offered on
a delayed  or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other  than  securities  offered  only  in  connection  with  dividend or
interest reinvestment plans, check the following box.
                        <square>X
   If this form is filed to register  additional  securities  for  an  offering
pursuant  to  Rule  462(b) under the Securities Act, please check the following
box and list the Securities  Act  registration  statement number of the earlier
effective registration statement for the same offering.
                         <square>
   If  this  form  is  a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act,  check  the following box and list the Securities Act
registration statement number of the  earlier  effective registration statement
for the same offering.
                         <square>
   If delivery of the prospectus is expected to be made pursuant to Rule  434,
please check the following box.
                         <square>



<TABLE>
<CAPTION>
                    CALCULATION OF REGISTRATION FEE
<S>           <C>             <C>                <C>                <C>
               AMOUNT TO       PROPOSED MAXIMUM   PROPOSED MAXIMUM   AMOUNT OF
TITLE OF       BE REGISTERED   AGGREGATE PRICE    AGGREGATE        REGISTRATION 
SHARES                         PER UNIT{(1)}      OFFERING PRICE        FEE
TO BE 
REGISTERED 
Common Stock, 
par value  
$.01 per share   75,000         $8.13            $609,750            $180.00

</TABLE>

(1)Estimated solely  for  purposes  of  calculating  the  registration  fee  in
   accordance  with  Rule 457(c) under the Securities Act of 1933, based on the
   average of the high and low prices per share of the Common Stock reported on
   the Nasdaq National Market on January 21, 1998.


   THE REGISTRANT HEREBY  AMENDS  THIS  REGISTRATION  STATEMENT ON SUCH DATE OR
DATES  AS  MAY  BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL  THE  REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER  BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR  UNTIL  THE  REGISTRATION  STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.



<PAGE>


INFORMATION  CONTAINED  HEREIN  IS  SUBJECT TO COMPLETION OR AMENDMENT.   A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION.   THESE  SECURITIES MAY NOT BE SOLD NOR
MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME  THE REGISTRATION STATEMENT
BECOMES EFFECTIVE.  THIS PROSPECTUS SHALL NOT CONSTITUTE  AN  OFFER TO SELL
OR THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE  WOULD BE
UNLAWFUL  PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES  LAWS
OF ANY SUCH STATE.

           SUBJECT TO COMPLETION, DATED JANUARY 22, 1998

                            PROSPECTUS

                          75,000 Shares

                            MFRI, INC.

                           COMMON STOCK

     This Prospectus  relates  to 75,000 shares ("Shares") of common stock,
par value $.01 per share (the "Common  Stock"),  of  MFRI, Inc., a Delaware
corporation (the "Company"), which may hereafter be offered  or  sold  from
time  to  time  for the account of persons named under the caption "Selling
Stockholders."

     The Shares may  be issued from time to time pursuant to options issued
in connection with the  purchase  of  TDC  Filter  Manufacturing,  Inc.,  a
Delaware corporation, by the Company, which occurred on December 3, 1997.

     The  Shares may hereafter be offered or sold from time to time for the
account of  persons  named  under the caption "Selling Stockholders" on the
Nasdaq  National  Market,  or  otherwise,  at  prices  and  on  terms  then
obtainable,   in  broker's  transactions,   special   offerings,   exchange
distributions,  negotiated  transactions, block transactions, or otherwise.
See "Selling Stockholders" and  "Plan  of  Distribution."  The Company will
not realize any proceeds from any sale of the Shares.

     The Common Stock is traded on the Nasdaq  National  Market  under  the
symbol  "MFRI."   On  January 21, 1998, the last reported sale price of the
Common Stock on the Nasdaq National Market was $8.13.
                          ______________

THESE SECURITIES HAVE NOT  BEEN  APPROVED  OR DISAPPROVED BY THE SECURITIES
AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES  COMMISSION  NOR  HAS  THE
COMMISSION  PASSED  OR ANY STATE SECURITIES COMMISSION UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS.   ANY  REPRESENTATION  TO  THE  CONTRARY  IS A
CRIMINAL OFFENSE.
                          ______________

         THE DATE OF THIS PROSPECTUS IS ___________, 1998

<PAGE>


     NO  DEALER,  BROKER  OR  OTHER  PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS,  OTHER  THAN THOSE CONTAINED OR
INCORPORATED HEREIN BY REFERENCE IN THIS PROSPECTUS, IN CONNECTION WITH THE
OFFERING  MADE  HEREBY,  AND,  IF  GIVEN  OR  MADE,  SUCH  INFORMATION   OR
REPRESENTATIONS  MUST  NOT  BE  RELIED  ON AS HAVING BEEN AUTHORIZED BY THE
COMPANY OR THE SELLING SHAREHOLDERS.  THIS  PROSPECTUS  DOES NOT CONSTITUTE
AN  OFFER TO SELL OR A SOLICITATION OF ANY OFFER TO BUY THE  SECURITIES  TO
WHICH IT RELATES IN ANY JURISDICTION IN WHICH, OR TO ANY PERSON TO WHOM, IT
IS UNLAWFUL TO MAKE SUCH AN OFFER OR SOLICITATION OF AN OFFER.  NEITHER THE
DELIVERY  OF  THIS  PROSPECTUS  NOR ANY OFFER OR SALE MADE HEREUNDER SHALL,
UNDER ANY CIRCUMSTANCES, CREATE ANY  IMPLICATION  THAT  THERE  HAS  BEEN NO
CHANGE IN THE INFORMATION SET FORTH HEREIN OR IN THE AFFAIRS OF THE COMPANY
SINCE THE DATE HEREOF.

     THIS PROSPECTUS, INCLUDING DOCUMENTS INCORPORATED HEREIN BY REFERENCE,
CONTAINS  FORWARD-LOOKING  STATEMENTS WITHIN THE MEANING OF SECTION 27A  OF
THE SECURITIES ACT AND SECTION  21E  OF  THE EXCHANGE ACT.  FORWARD-LOOKING
STATEMENTS ARE INHERENTLY SUBJECT TO RISKS AND UNCERTAINTIES, MANY OF WHICH
CANNOT BE PREDICTED WITH ACCURACY AND SOME  OF  WHICH  MIGHT  NOT  EVEN  BE
ANTICIPATED.   FUTURE  EVENTS  AND ACTUAL RESULTS, FINANCIAL AND OTHERWISE,
MAY DIFFER MATERIALLY FROM THE RESULTS  DISCUSSED  IN  THE  FORWARD-LOOKING
STATEMENTS.   FACTORS THAT MIGHT CAUSE SUCH A DIFFERENCE INCLUDE,  BUT  ARE
NOT  LIMITED  TO,   THOSE   DISCUSSED  IN  "RISK  FACTORS"  HEREIN  AND  IN
"MANAGEMENT'S  DISCUSSION  AND   ANALYSIS  OF  RESULTS  OF  OPERATIONS  AND
FINANCIAL CONDITION" INCORPORATED  BY  REFERENCE  IN  THE  COMPANY'S ANNUAL
REPORT  ON FORM 10-K FOR THE FISCAL YEAR ENDED JANUARY 31, 1997,  WHICH  IS
INCORPORATED BY REFERENCE IN THIS PROSPECTUS.


                         TABLE OF CONTENTS
<TABLE>
<CAPTION>
<S>                                                        <C>                   
                       

                                                              PAGE

AVAILABLE INFORMATION .......................................    3
RISK FACTORS ................................................    3
THE COMPANY .................................................    4
SELLING STOCKHOLDERS ........................................    6
USE OF PROCEEDS .............................................    6
PLAN OF DISTRIBUTION ........................................    6
LEGAL MATTERS ...............................................    7
EXPERTS .....................................................    7
INFORMATION INCORPORATED BY REFERENCE .......................    8

</TABLE>


<PAGE>
                        AVAILABLE INFORMATION

     The  Company  is  subject  to  the  informational  requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange  Act"),  and  in
accordance  therewith,  files  periodic reports, proxy statements and other
information with the Securities and Exchange Commission (the "Commission").
Such reports, proxy statements and  other  information can be inspected and
copied at the public reference facilities maintained  by  the Commission at
Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549,  and should also
be  available  for  inspection and copying at the regional offices  of  the
Commission located at  75  Park Place, 14th Floor, New York, New York 10007
and 500 West Madison Street,  Suite  1400, Chicago, Illinois 60661.  Copies
of such material can also be obtained  from the Public Reference Section of
the  Commission  at  450  Fifth Street, N.W.,  Washington,  D.C.  20549  at
prescribed  rates.  The Commission  maintains  a  Web  site  that  contains
reports, proxy  and information statements, and other information about the
Company.  The address  of  the  Web  site  maintained  by the Commission is
"http://www.sec.gov".   The Common Stock is traded on the  National  Market
tier of the Nasdaq Stock  Market  ("Nasdaq").   Information  filed  by  the
Company  with  Nasdaq  may  be obtained at 1735 K Street, N.W., Washington,
D.C. 20006.

     This Prospectus constitutes  a  part  of  a  registration statement on
Form  S-3  (herein,  together  with  all  amendments  and   exhibits,   the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities  Act"), filed by the Company.  This Prospectus does not contain
all of the information  set  forth  in  the  Registration  Statement.   For
further   information,   reference  is  hereby  made  to  the  Registration
Statement,  including  the  financial   schedules  and  exhibits  filed  or
incorporated by reference as a part thereof,  which  may be examined at the
Public  Reference  Room  of  the  Commission in Washington,  D.C.,  without
charge, or copies of which may be obtained from the Commission upon payment
of  the  prescribed  fees.   Statements  contained  herein  concerning  the
provisions  of  documents  filed   herewith  as  exhibits  are  necessarily
summaries of such documents, and each  such  statement  is qualified in its
entirety by reference to the copy of the applicable document filed with the
Commission.

                           RISK FACTORS

     COMPETITION; BUSINESS.  The businesses in which the Company is engaged
are  highly competitive.  In addition, new installations of  baghouses  are
subject  to  competition  from  alternative  technologies,  and the sale of
specialty piping systems and electronic leak detection and location systems
are  subject  to  competition  from alternative products.  The business  of
Thermal Care (as defined below) is dependent on the plastics industry.  Any
adverse trends in the plastics industry  may have a material adverse effect
on the business of Thermal Care.  Thermal  Care relies upon a single source
for  key  components  of  several of its products.   Although  the  Company
believes that there are alternate  sources  available  for such components,
there  can  be  no  assurance  that  the interruption of supplies  of  such
components would not have an adverse effect  on  the financial condition of
the Company, and that the Company, if required to  do  so, would be able to
negotiate agreements with alternative sources on acceptable terms.
     GOVERNMENT  REGULATION.  The demand for the Company's  leak  detection
and location systems  and  secondary  containment  piping systems is driven
primarily by government regulation with respect to hazardous  waste.   Laws
such  as  the Federal Resource Conservation and Recovery Act, and standards
such  as  the   National   Emission   Standard   for  Hydrocarbon  Airborne
Particulates,  have increased the demand for the Company's  leak  detection
and location and  secondary  containment  piping  systems.   The  Company's
filtration products business to a large extent is dependent on governmental
regulation  of  air pollution at the federal and state levels.  The Company
believes that continuing  growth  in  the  sale  of filtration products and
services  will  be  materially  dependent  on  continuing   enforcement  of
environmental  laws such as the Federal Clean Air Act Amendments  of  1990.
Although changes  in  such  environmental  regulations  could significantly
alter the demand for the Company's products and services,  the Company does
not  believe  that  such  a  change  is  likely to decrease demand  in  the
foreseeable future.

     ECONOMIC FACTORS.  Although demand for  many of the Company's products
is generally affected by its customers' need to  comply  with  governmental
regulations, purchases of the Company's products at times may be delayed by
customers due to adverse economic factors.

     DIVIDENDS.   The Company has not paid dividends in the past  and  does
not anticipate paying cash dividends on the Common Stock in the foreseeable
future.   The  Company's   line   of   credit  agreement  contains  certain
restrictions  on  payment  of dividends.  The  primary  restriction  limits
dividends to a cumulative amount of up to 25% of net income.


                            THE COMPANY

     The Company is engaged  in the manufacture and sale of filter bags for
use in industrial air pollution  control  systems known as "baghouses", and
also engineers, designs and manufactures specialty  piping systems and leak
detection  and  location systems, and industrial water  cooling  equipment.
The Company, which  was  incorporated  in  Delaware in October 1993, is the
successor  corporation  to  Midwesco  Filter  Resources,   Inc.  ("Midwesco
Filter").

     Midwesco  Filter  was incorporated in Delaware in October  1989  as  a
wholly-owned  subsidiary   of  Midwesco,  Inc.  ("Midwesco"),  an  Illinois
corporation.  On December 13, 1989, Midwesco Filter exchanged shares of its
common stock for the net assets  constituting the Midwesco Filter Resources
division ("Filter Division") of Midwesco.   The  Filter Division was formed
from  certain  assets  of  the  Filter  Media  division  of  the  Kennecott
Corporation, acquired by Midwesco in June 1982, and certain  assets  of the
Filter Resources Corporation, acquired by Midwesco in December 1983.

     On  January  28,  1994  pursuant  to a merger transaction ("Perma-Pipe
Transaction") between the Company, a subsidiary of the Company and Midwesco
Filter, the Company acquired the Perma-Pipe  business  ("Perma-Pipe")  from
Midwesco  for  cash  and  278,666  shares of Common Stock.  Pursuant to the
Perma-Pipe Transaction, each share of  common  stock of Midwesco Filter was
exchanged  for  one  share  of  Common  Stock.  Immediately  prior  to  the
effective  time  of  the Perma-Pipe Transaction,  a  public  offering  (the
"Offering") of shares  of  common stock of Midwesco Filter was consummated,
the  net  proceeds  of which were  used  to  repay  bank  debt  related  to
Perma-Pipe.  Perma-Pipe  is  in  the business of engineering, designing and
manufacturing specialty piping systems  and  leak  detection  and  location
systems.

     On  September  30,  1994,  the  Company  and  an indirect wholly-owned
subsidiary  of the Company, pursuant to a purchase agreement  dated  as  of
such date ("Purchase  Agreement"), acquired substantially all of the assets
of Ricwil Piping Systems  Limited  Partnership  ("Ricwil  LP") for cash and
55,710 shares of Common Stock, as adjusted in accordance with  the terms of
the  Purchase Agreement.  Ricwil LP was a manufacturer of insulated  piping
systems for district heating and cooling systems.

     On  December  6, 1995, Perma-Pipe acquired for cash the net assets and
leak detection business of Hagenuk GmbH.

     On  August 15, 1996,  the  Company,  pursuant  to  an  Asset  Purchase
Agreement  dated  as  of  such  date  (the  "Eurotech Agreement"), acquired
substantially all of the assets of Eurotech Air Filtration, Inc., an Oregon
corporation  ("Eurotech"),  for cash and 30,571  shares  of  Common  Stock.
Pursuant to the Eurotech Agreement, Eurotech distributed such shares to its
four shareholders.

     On December 30, 1996, the  Company  acquired the Thermal Care Division
("Thermal  Care") and certain other specified  assets  and  liabilities  of
Midwesco by  the  merger  of  Midwesco  with  and  into  the  Company  (the
"Merger").   Through the Merger, an aggregate of 2,124,298 shares of Common
Stock were issued  to the shareholders of Midwesco and the 1,717,666 shares
of Common Stock owned  by Midwesco immediately prior to the consummation of
the  Merger  were  cancelled.    Thermal   Care   engineers,   designs  and
manufactures industrial water cooling equipment.

     On  December  3,  1997,  the  Company  and  a wholly-owned subsidiary,
pursuant  to a Stock Purchase Agreement dated as of  such  date  (the  "TDC
Agreement"),   acquired  all  of  the  outstanding  shares  of  TDC  Filter
Manufacturing, Inc.,  a  Delaware corporation ("TDC"), and the related real
estate for cash and options  to  purchase  an aggregate of 75,000 shares of
Common Stock.

     The Company's filtration products business  is  carried on by Midwesco
Filter and TDC, and the piping system products business  is  carried  on by
Perma-Pipe,  Inc.   Midwesco  Filter  and Perma-Pipe, Inc. are wholly-owned
subsidiaries  of  MFRI.   As  used herein,  unless  the  context  otherwise
requires, the term Company includes  MFRI,  Inc.,  Midwesco Filter, Thermal
Care, Perma-Pipe, Inc., TDC, and their subsidiaries and predecessors.

     The Company's principal executive offices are located  at  7720 Lehigh
Avenue,  Niles,  Illinois 60714 and its telephone number is (847) 966-1000.
Other  information   concerning   the   Company's   management,   business,
securities, and results of operations is incorporated by reference from its
reports  filed  with  the  Commission.   See  "Information  Incorporated by
Reference."

                           SELLING STOCKHOLDERS

     The  Shares  may be offered from time to time for the account  of  the
Selling Stockholders  whose  names  are set forth in the table below.  This
Prospectus also may be used by transferees,  assignees, and pledgees of any
of  the  Selling  Stockholders.   The table sets forth  information  as  of
December 31, 1997 with respect to the beneficial ownership of the Shares by
the Selling Stockholders.  To the knowledge  of  the  Company,  none of the
Selling Stockholders has any material relationship with the Company  except
as  set  forth  in  the  footnotes to the following table and as more fully
described  elsewhere  in  this   Prospectus   (including   the  information
incorporated by reference in this Prospectus).

<TABLE>
<CAPTION>
                         NO. OF SHARES OWNED NO. OF SHARES  NO. OF SHARES

                         PRIOR TO Offering   WHICH MAY BE   WHICH MAY BE OWNED
SELLING STOCKHOLDER                          OFFERED        AFTER OFFERING
<S>                        <C>               <C>           <C>
Roy E. Greenlees and Lorie 70,500             70,500           0
Greenlees as Joint Tenants
{(1)}
Janet Marshall{(2)}        4,500               4,500            0
</TABLE>

__________________________

{(1) }Roy  E.  Greenlees  is  a  Director  and President of TDC, which is a
     wholly-owned subsidiary of the Company.

{(2) }Janet Marshall is Vice President of TDC.


                          USE OF PROCEEDS

     This Prospectus relates solely to Shares  being offered and sold
for the accounts of the Selling Stockholders.  The  Company  will not
realize  any  proceeds  from  any  sale  of  Shares  by  the  Selling
Stockholders.


                       PLAN OF DISTRIBUTION

     The  Selling Stockholders may offer and sell Shares by means  of
the Prospectus  from  time  to  time  in  one  or  more transactions,
directly by the Selling Stockholders, or through agents,  dealers  or
brokers to be designated from time to time; such offers and sales may
be  effected  over  any  national  securities  exchange  or automated
interdealer quotation system on which shares of the Common  Stock are
then  listed, in negotiated transactions or in a combination of  such
methods  of  sale;  the  selling price of the Shares may be at market
prices prevailing at the time  of  sale,  at  prices  related to such
prevailing market prices or at negotiated prices; and the  Shares may
also   be   offered   in   coordinated   block  transactions  through
underwriters,  dealers  or  agents,  or  otherwise  who  may  receive
compensation  in  the  form of underwriting or  brokerage  discounts,
concessions or commissions  from  the  Selling  Stockholders  or  the
purchasers  of  such  Shares  for  whom  they  may act as agents.  In
certain states, the Selling Stockholders may be required to offer and
sell  Shares  only  through  brokers and dealers registered  in  such
states.

     The Selling Stockholders  and any brokers or dealers that act in
connection with the sale of Shares  hereunder  may  be  deemed  to be
"underwriters"  within the meaning of Section 2(11) of the Securities
Act and any commissions  received  by them and any profit on the sale
of Shares as principal may be deemed to be underwriting discounts and
commissions under the Securities Act.   Neither  the  Company nor the
Selling  Stockholders  can  presently  estimate  the amount  of  such
compensation.  The Company knows of no existing arrangements  between
any selling Stockholder and any underwriter, broker, dealer, or other
agent relating to the sale or distribution of the Shares.

     The  Company  will  pay  all of the expenses of the preparation,
printing and filing of the Registration  Statement, any amendments or
supplements  thereto, and prospectuses and  revised  prospectuses  as
required to cover  the  transactions  covered  hereby, as well as the
Company's  fees  and  disbursements  of its counsel  and  accountants
relating  to  the Registration Statement,  but  the  Company  is  not
obligated to pay any underwriting discounts and commissions, brokers'
commissions or  charges,  the  legal fees and expenses of the Selling
Stockholders, or transfer taxes,  if  any,  relating  to  the sale or
disposition  of  Shares  by  a  Selling  Shareholder.   Each  Selling
Stockholder  may  indemnify any broker, dealer, agent, or underwriter
that participates in  transactions  involving  sales  of  the  Shares
against certain liabilities, including liabilities arising under  the
Securities Act.

     The  Selling  Stockholders may also resell Shares in open market
transactions pursuant  to the resale provisions of Rule 144 under the
Securities  Act  or in transactions  otherwise  permitted  under  the
Securities Act.


                           LEGAL MATTERS

     Certain legal  matters  in connection with the Shares, including
the validity of the Shares, will  be  passed  upon for the Company by
Rudnick & Wolfe, Chicago, Illinois.


                              EXPERTS

     The  Consolidated  Financial  Statements  of  MFRI,   Inc.   and
subsidiaries  incorporated  in  this Prospectus by reference from the
Company's Annual Report on Form 10-K  for  the year ended January 31,
1997 and the Consolidated Financial Statements  of Midwesco, Inc. and
subsidiaries  incorporated in this Prospectus by reference  from  the
Company's Current  Report on Form 8-K dated August 11, 1997 have been
audited by Deloitte  & Touche LLP, independent auditors, as stated in
their reports, which are  incorporated  herein by reference, and have
been so incorporated in reliance upon the  reports of such firm given
upon their authority as experts in accounting and auditing.


               INFORMATION INCORPORATED BY REFERENCE

     The following documents previously filed  by  the Company or its
predecessor  with  the Commission pursuant to the Exchange  Act  (SEC
File No. 0-18370) are  hereby  incorporated  by  reference  into this
Prospectus:


       (i)     the   Company's  Current  Report  on  Form  8-K  dated
               December 12, 1997;

      (ii)     the Company's  Current Report on Form 8-K dated August
               11, 1997;

     (iii)     the Company's Annual  Report  on  Form  10-K  for  the
               fiscal year ended January 31, 1997; and

      (iv)     the   registration   statement   of   Midwesco  Filter
               Resources,   Inc.,   a  predecessor  and  wholly-owned
               subsidiary of the Company,  on Form 8-A filed on March
               13,  1990 registering common stock  of  the  Company's
               predecessor  under  Section  12(g)  of  the Securities
               Exchange Act of 1934.

<PAGE>

     All  documents  filed by the Company pursuant to Section  13(a),
13(c), 14 or 15(d) of  the  Exchange  Act  after  the  date  of  this
Prospectus  and  before  the termination of the offering of shares of
the Common Stock made hereby  are  hereby  incorporated by reference,
and such documents are deemed to be a part hereof  from  the  date of
filing  of  such  documents.   Any  statement contained in a document
incorporated or deemed to be incorporated  by  reference herein shall
be  modified  or  superseded for purposes of this Prospectus  to  the
extent that a statement contained herein or in any other subsequently
filed document which  is or is deemed to be incorporated by reference
herein modifies or supersedes  such statement.  Any such statement so
modified  or  superseded  shall  not,   except   as  so  modified  or
superseded, constitute a part of this Prospectus.

     THE  COMPANY  WILL  PROVIDE  WITHOUT  CHARGE  TO  EACH   PERSON,
INCLUDING  ANY  BENEFICIAL  OWNER OF COMMON STOCK, TO WHOM A COPY  OF
THIS PROSPECTUS IS DELIVERED,  UPON  THE  ORAL  OR WRITTEN REQUEST OF
SUCH PERSON, A COPY OF ANY AND ALL OF THE INFORMATION  THAT  HAS BEEN
INCORPORATED  BY REFERENCE IN THIS PROSPECTUS (NOT INCLUDING EXHIBITS
TO THE INFORMATION  THAT  IS  INCORPORATED  BY  REFERENCE UNLESS SUCH
EXHIBITS   ARE  SPECIFICALLY  INCORPORATED  BY  REFERENCE   IN   SUCH
INFORMATION).  SUCH REQUEST SHOULD BE DIRECTED TO MICHAEL D. BENNETT,
SECRETARY, MFRI,  INC.,  7720  LEHIGH  AVENUE,  NILES, ILLINOIS 60714
(TELEPHONE (847) 966-1000).


<PAGE>
                              PART II

              INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The  following  table  sets  forth  expenses to be  incurred  in
connection with the issuance and distribution of the securities being
registered hereby:

     S.E.C. registration fee                  $            180.00

     *Legal and accounting fees
      and expenses                            $         10,000.00

     *Miscellaneous                           $          1,820.00

     Total                                    $         12,000.00

     The  Company  has  agreed  to pay all of  the  expenses  of  the
preparation, printing and filing  of  the Registration Statement, any
amendments  or  supplements  thereto, and  prospectuses  and  revised
prospectuses as required to cover the transactions covered hereby, as
well  as the Company's fees and  disbursements  of  its  counsel  and
accountants  relating  to the Registration Statement, but the Selling
Stockholders will bear their  pro  rata  portion  of any underwriting
discounts and commissions, brokers' commissions or  charges, or other
costs arising in the marketing of the Shares and their own legal fees
and expenses.
________________
*    Estimated.


Item 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Section 145 of the Delaware General Corporation  Law  authorizes
indemnification of directors, officers, employees and agents  of  the
Company;  allows  the  advancement  of  costs  of  defending  against
litigation;   and  permits  companies  incorporated  in  Delaware  to
purchase insurance  on  behalf  of directors, officers, employees and
agents against liabilities whether  or  not in the circumstances such
companies would have the power to indemnify  against such liabilities
under the provisions of the statute.

     The  Company's  Certificate  of Incorporation  and  its  By-Laws
provide for indemnification of its officers and directors to the full
extent permitted by Section 145 of  the  Delaware General Corporation
Law.


<PAGE>

     The Company's Certificate of Incorporation  eliminates,  to  the
fullest  extent permitted by Delaware law, liability of a director to
the Company  or its stockholders for monetary damages for a breach of
such director's  fiduciary  duty of care except for liability where a
director (a) breaches his or  her  duty  of loyalty to the Company or
its  stockholders,  (b)  fails to act in good  faith  or  engages  in
intentional misconduct or  knowing  violation  of law, (c) authorizes
payment of an illegal dividend or a stock repurchase  or  (d) obtains
an  improper personal benefit.  While liability for monetary  damages
has  been eliminated, equitable remedies such as injunctive relief or
rescission remain available.  In addition, a director is not relieved
of his  responsibilities  under  any other law, including the federal
securities laws.

     The Company has entered into  indemnification  agreements in the
form described below with each person who is currently  a  member  of
the  Board  of  Directors  of  the  Company  and will enter into such
agreements  with persons who in the future become  directors  of  the
Company.  Such indemnification agreements provide for indemnification
against any and  all expenses incurred in connection with, as well as
any  and  all  judgments,  fines,  and  amounts  paid  in  settlement
resulting from,  any  threatened, pending, or completed action, suit,
or   proceeding,  whether   civil,   criminal,   administrative,   or
investigative  (collectively an "Action"), by reason of the fact that
such director is or was a director, officer, employee or agent of the
Company, or is or  was  serving  at  the  request of the Company as a
director,   officer,  employee  or  agent  of  another   corporation,
partnership,   joint   venture,  trust,  or  other  enterprise.   The
indemnification agreements  provide  that  if any payment, advance or
indemnification of the director requires that he or she acted in good
faith, in a manner he or she reasonably believed  to  be  for  or not
opposed  to  the  best interests of the Company or without reasonable
cause to believe his  or  her  conduct was unlawful, then it shall be
presumed that he or she so acted unless proven otherwise by clear and
convincing evidence.  The indemnification agreements also provide for
the  advancement  of all expenses,  including  reasonable  attorneys'
fees, arising from  the  investigation  of any claim, preparation for
the   defense   or   defense  or  settlement  of  an   Action.    The
indemnification agreements  authorize  the  Company to participate in
the  defense  of any action and to assume the defense  thereof,  with
counsel  who  shall  be  reasonably  satisfactory  to  the  director,
provided that the  director  shall be entitled to separate counsel of
his or her choosing if he or she  reasonably  believes that (i) there
exists  conflicting  interests  between himself or  herself  and  the
Company or other parties (the defense  of whom the Company shall have
assumed) or (ii) there is any substantial likelihood that the Company
will  be  financially or legally unable to  satisfy  its  obligations
under the Indemnification  Agreement.  The indemnification agreements
provide  that  a  director's  rights  under  such  contract  are  not
exclusive of any other indemnification  rights  he  or  she  may have
under   any   provision   of   law,   the  Company's  Certificate  of
Incorporation or By-laws, the vote of the  Company's  stockholders or
disinterested directors, other agreements or otherwise.

Item 16.  EXHIBITS.

     EXHIBIT   EXHIBIT
     NUMBER    DESCRIPTION

     2.1       Stock Purchase Agreement dated December 3, 1997 by and
               between  Roy  E.  Greenlees,  Lorie  Greenlees,  Janet
               Marshall and MFRI, Inc. incorporated by  reference  in
               Current  Report  on  Form  8-K dated December 12, 1997
               (SEC File No. 0-18370).

     5         Form of Opinion of Rudnick & Wolfe with respect to the
               legality of the Common Stock being registered

     23.1      Consent of Deloitte & Touche LLP

     23.2      Consent  of Rudnick & Wolfe (contained  in  Exhibit  5
               hereof)

     24        Power of Attorney of directors and certain officers of
               the Company.

Item 17.  UNDERTAKINGS.

     The Registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are
     being  made, a post-effective  amendment  to  this  registration
     statement;

              (i)    To    include   any   prospectus   required   by
          Section 10(a)(3) of the Securities Act of 1933;

             (ii) To reflect  in  the  prospectus any facts or events
          arising  after  the  effective  date  of  the  registration
          statement  (or  the  most  recent post-effective  amendment
          thereof) which, individually or in the aggregate, represent
          a fundamental change in the  information  set  forth in the
          registration statement;

            (iii) To include any material information with respect to
          the  plan of distribution not previously disclosed  in  the
          registration  statement  or  any  material  change  to such
          information in the registration statement;

     PROVIDED,  HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii)  do
     not apply if the registration statement is on Form S-3, Form S-8
     or Form F-3,  and  the  information required to be included in a
     post-effective amendment  by  those  paragraphs  is contained in
     periodic reports filed by the Registrant pursuant  to Section 13
     or  15(d)  of  the  Securities  Exchange  Act  of 1934 that  are
     incorporated by reference in the registration statement.

          (2)  That,  for  the  purpose of determining any  liability
     under  the  Securities Act of  1933,  each  such  post-effective
     amendment shall  be  deemed  to  be a new registration statement
     relating to the securities offered  therein, and the offering of
     such securities at that time shall be  deemed  to be the initial
     BONA FIDE offering thereof.

          (3)  To  remove  from  registration  by  means of  a  post-
     effective amendment any of the securities being registered which
     remain unsold at the termination of the offering.

     The undersigned registrant hereby undertakes that,  for purposes
of  determining any liability under the Securities Act of 1933,  each
filing of the registrant's annual report pursuant to Section 13(a) or
15(d)  of the Securities Exchange Act of 1934 (and, where applicable,
each filing  of  an employee benefit plan's annual report pursuant to
Section  15(d) of the  Securities  Exchange  Act  of  1934)  that  is
incorporated  by  reference  in  the  registration statement shall be
deemed to be a new registration statement  relating to the securities
offered  therein, and the offering of such securities  at  that  time
shall be deemed to be the initial BONA FIDE offering thereof.

     The undersigned registrant hereby undertakes to deliver or cause
to be delivered  with  the  Prospectus,  to  each  person to whom the
Prospectus  is  sent or given, the latest annual report  to  security
holders that is incorporated  by  reference  in  the  Prospectus  and
furnished  pursuant  to and meeting the requirements of Rule 14a-3 or
Rule 14c-3 under the Securities  Exchange  Act  of  1934;  and, where
interim  financial information required to be presented by Article  3
of Regulation  S-X is not set forth in the Prospectus, to deliver, or
cause to be delivered  to  each person to whom the Prospectus is sent
or  given,  the  latest  quarterly   report   that   is  specifically
incorporated by reference in the Prospectus to provide  such  interim
financial information.

     Insofar  as  indemnification  for  liabilities arising under the
Securities Act of 1933 may be permitted to  directors,  officers  and
controlling  persons  of  the  registrant  pursuant  to the foregoing
provisions, or otherwise, the registrant has been advised that in the
opinion    of   the   Securities   and   Exchange   Commission   such
indemnification  is against public policy as expressed in the Act and
is,  therefore,  unenforceable.   In  the  event  that  a  claim  for
indemnification against such liabilities  (other  than the payment by
the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any
action, suit or proceeding) is asserted by such director,  officer or
controlling   person   in   connection   with  the  securities  being
registered, the registrant will, unless in the opinion of its counsel
the matter has been settled by controlling  precedent,  submit  to  a
court   of   appropriate   jurisdiction  the  question  whether  such
indemnification by it is against  public  policy  as expressed in the
Act and will be governed by the final adjudication of such issue.
<PAGE>
                            SIGNATURES

     Pursuant to the requirements of the Securities  Act of 1933, the
registrant certifies that it has reasonable grounds to  believe  that
it  meets all of the requirements for filing on Form S-3 and has duly
caused  this registration statement to be signed on its behalf by the
undersigned,  thereunto  duly authorized, in the City of Niles, State
of Illinois, on January 22, 1998.

                                   MFRI, INC.


                                   By:/S/ DAVID UNGER
                                        David Unger
                                        Chief Executive Officer


                                   By:/S/ DAVID UNGER
                                        David Unger
                                        Chairman of the Board


                                   By:/S/ DAVID UNGER
                                        David Unger
                                        President

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons
in the capacities and on the date indicated.

     SIGNATURE                TITLE               DATE

     /s/ David Unger*     Director and Chairman of the
                          Board of Directors (Principal
                          Executive Officer)      January 22, 1998

     Henry M. Mautner*    Director, Vice Chairman of
                          the Board of Directors  January 22, 1998

     Michael D. Bennett*  Vice President, Secretary and
                          Treasurer (Principal Financial
                          and Accounting Officer) January 22, 1998

     Arnold F. Brookstone* Director               January 22, 1998

     Don Gruenberg*       Director                January 22, 1998

     Bradley E. Mautner*  Director                January 22, 1998

     Eugene Miller*       Director                January 22, 1998

     Gene K. Ogilvie*     Director January 22, 1998

     Stephen B. Schwartz* Director                January 22, 1998


     *By:/S/ DAVID UNGER        
         Individually and as Attorney- January 22, 1998
         David Unger in-fact


<PAGE>
                                                        EXHIBIT 5

                          RUDNICK & WOLFE
                     203 NORTH LASALLE STREET
                   CHICAGO, ILLINOIS 60601-1293

                         January 22, 1998          (312) 368-4000

The Board of Directors
MFRI, Inc.
7720 Lehigh Avenue
Niles, IL 60714

Gentlemen:

     We have examined the  registration  statement  on Form S-3 filed
with the Securities and Exchange Commission on or about  January  22,
1998,  for registration under the Securities Act of 1933, as amended,
of 75,000  shares  of  common  stock to be issued pursuant to certain
options granted on December 3, 1997  of MFRI, Inc. (the "Options"), a
Delaware  corporation  (the "Company"),  par  value  $.01  per  share
("Common Stock").  We have examined pertinent corporate documents and
records of the Company,  including  its Certificate of Incorporation,
By-Laws  and  the  Options, and we are familiar  with  the  corporate
proceedings had and  contemplated  in connection with the issuance of
such shares of Common Stock by the Company.   We  have also made such
other  examinations as we have deemed necessary or appropriate  as  a
basis for the opinion hereinafter expressed.

     On  the  basis of the foregoing, we are of the opinion that such
75,000  shares  of  Common  Stock  of  the  Company  have  been  duly
authorized, and when  issued  in  accordance  with  the  terms of the
Options, will be legally issued, fully paid and non-assessable.

     We hereby consent to the filing of this opinion as an exhibit to
the  registration statement and to the reference to our firm  in  the
registration statement under the caption "Legal Matters."

                                  Very truly yours,

                                  RUDNICK & WOLFE



                                  By:/S/ HAL M. BROWN
                                      Hal M. Brown, a Partner


<PAGE>
                                                     EXHIBIT 23.1


                CONSENT OF INDEPENDENT ACCOUNTANTS


We consent  to  the  incorporation  by reference in this Registration
Statement of MFRI, Inc. on Form S-3 of  our  report  dated  April 18,
1997  with respect to the Consolidated Financial Statements of  MFRI,
Inc. and  subsidiaries appearing in the Annual Report on Form 10-K of
MFRI, Inc.  for  the  year  ended January 31, 1997, and of our report
dated May 28, 1996 (August 14,  1996  as  to  the second paragraph of
Note  6)  with  respect to the Consolidated Financial  Statements  of
Midwesco, Inc. and  subsidiaries  appearing  in the Current Report on
From 8-K of MFRI, Inc. dated August 11, 1997, and to the reference to
us under the caption "Experts" in the Prospectus,  which  is  part of
this Registration Statement.



                                   /S/ DELOITTE & TOUCHE LLP
                                   Deloitte & Touche LLP


Chicago, Illinois
January 22, 1998


<PAGE>
                                                       EXHIBIT 24


                         POWER OF ATTORNEY


     KNOW  ALL  MEN  BY THESE PRESENTS, that each of the undersigned,
being a director or officer,  or  both,  of  MFRI,  Inc.,  a Delaware
corporation (the "Company"), does hereby constitute and appoint David
Unger,  Henry  M.  Mautner,  Bradley  E.  Mautner,  Fati  Elgendy and
Michael D. Bennett with full power of substitution and resubstitution
to  each of said attorneys, to execute, file or deliver any  and  all
instruments  and  to  do  any  and  all  acts  and  things which said
attorneys and agents, or any of them, deem advisable  to  enable  the
Company  to  comply  with the Securities Act of 1933, as amended, and
any  requirements  or regulations  of  the  Securities  and  Exchange
Commission in respect  thereto,  in  connection with the registration
under said Securities Act of the sale  of  shares  of common stock of
the Company by certain stockholders of the Company,  which shares are
to  be  issued  by  the  Company  in  connection with options  issued
pursuant  to  the Stock Purchase Agreement  dated  December  3,  1997
between Roy E.  Greenlees, Lorie Greenlees and Janet Marshall and the
Company,  including  specifically,  but  without  limitation  of  the
general authority hereby granted, the power and authority to sign his
or her name  as  director  or  officer,  or  both, of the Company, as
indicated below opposite his or her signature,  to  the  registration
statements and any amendment, post-effective amendment, supplement or
papers supplemental thereto, to be filed with respect to said  shares
of common stock, and each of the undersigned does hereby fully ratify
and  confirm  all that said attorneys and agents, or any one of them,
or the substitute  of  any  of  them, shall do or cause to be done by
virtue hereof.

     IN WITNESS WHEREOF, each of the undersigned has subscribed these
presents, this 22nd day of January, 1998.

     SIGNATURE                          TITLE

     /S/ DAVID UNGER               Director, Chairman of the Board of
     David Unger                   Directors and President (Principal
                                   Executive Officer)

     /S/ HENRY M. MAUTNER          Director  and Vice Chairman of the
                                   Board of
     Henry M. Mautner              Directors

     /S/ GENE K. OGILVIE           Director and Vice President
     Gene K. Ogilvie

     /S/ MICHAEL D. BENNETT        Vice  President,   Secretary   and
                                   Treasurer
     Michael D. Bennett            (Principal      Financial      and
                                   Accounting Officer)

     /S/ ARNOLD F. BROOKSTONE      Director
     Arnold F. Brookstone

     /S/ FATI ELGENDY              Director and Vice President
     Fati Elgendy

     /S/ DON GRUENBERG             Director and Vice President
     Don Gruenberg

     /S/ BRADLEY E. MAUTNER        Director and Vice President
     Bradley E. Mautner

     /S/ EUGENE MILLER             Director
     Eugene Miller

     /S/ STEPHEN B. SCHWARTZ       Director
     Stephen B. Schwartz







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