ORICA

                                   David P. Taylor
                                   Chief Executive Officer
                                   Orica USA Inc.
                                   9781 South Meridian Boulevard
                                   Suite 400
                                   Englewood, Colorado 80112
                                   Telephone: 303-268-5000

                                   August 23, 2000

BY MAIL AND VIA FACSIMILE: 405-236-0728

James L. Wewers, President
LSB Chemical Corp.
Post Office Box 754
Oklahoma City. Oklahoma 73101

               Re:  Purchase of LaRoche Assets*
                    __________________________
Dear Mr. Ewers:

     Orica USA Inc. and/or an affiliate of ("Orica") intends to
submit to LaRoche Industries, Inc. ("LaRoche") a bid (the "Bid") to
acquire certain of the assets of LaRoche's ammonium nitrate
manufacturing business (as specified in the Bid, the "Acquired
Assets"). Orica and LSB Chemical Corp. ("LSB") intend that LSB will
acquire certain of the Acquired Assets directly from LaRoche. When
executed by an authorized signatory of LSB, this letter shall
constitute the agreement of arica and LSB relating to the matters
set forth below:

     1.   The parties agree that Orica shall, in its sole
          discretion. have the ability to attend an auction being
          held for the sale of the Acquired Assets on August 24,
          2000 in Atlanta, Georgia. Orica shall have the authority
          to submit a Bid that, if successful, will obligate LS13
          to the terms of this letter.

     2.   The parties contemplate that Orica will submit an initial
          Bid for an aggregate cash purchase price for the Acquired
          Assets of $36.140,000.00 (the "Purchase Price"). Orica
          may thereafter, in its sole discretion, increase the
          amount of said Bid. Any such Bid shall include an amount
          of *** attributable and allocated to that portion of the
          Acquired Assets comprising LaRoche's manufacturing
          business located in Cherokee, Alabama and in Crystal
          City, Missquri ("collectively, the "LSB Acquired
          Assets").
                                                        Page 1 of 5
*INFORMATION IN THIS DOCUMENT HAS BEEN OMITTED FROM THIS PUBLIC
FILING PURSUANT TO A REQUEST BY THE COMPANY FOR CONFIDENTIAL
TREATMENT BY THE SECURITIES AND EXCHANGE COMMISSION.  THE OMITTED
INFORMATION HAS BEEN FILED SEPARATELY WITH THE SECRETARY OF THE
SECURITIES AND EXCHANGE COMMISSION FOR PURPOSES OF SUCH REQUEST.

***INDICATES INFORMATION IN THIS DOCUMENT WHICH HAS BEEN OMITTED
FROM THIS PUBLIC FILING PURSUANT TO A REQUEST BY THE COMPANY FOR
CONFIDENTIAL TREATMENT BY THE SECURITIES AND EXCHANGE COMMISSION.
THE OMITTED INFORMATION HAS BEEN FILED SEPARATELY WITH THE
SECRETARY OF THE SECURITIES AND EXCHANGE COMMISSION FOR PURPOSES OF
SUCH REQUEST.



     3.   No later than 9:30 a.m., Denver local time, on August 23;
          2000, LSB shall transmit by wire transfer to Orica a
          refundable deposit in the amount of *** representing
          LSB's portion of the earnest money deposit required by
          LaRoche. Orica shall provide complete account information
          for said wire transfer to LSB. Orica intends to make a
          $3,614,000.00 earnest money deposit to LaRoche in
          conjunction with the Bid, which will include the *** from
          LSB. In the event Orica is not the successful bidder at
          auction, Orica shall promptly refund said deposit to LSB
          upon receipt of its aggregate earnest money deposit from
          LaRoche.

     4.   In the event Orica is the successful bidder at auction,
          Orica shall enter into an Asset Purchase Agreement with
          LaRoche, whereby LaRoche shall be directed to assign all
          right, title and interest to the LSB Acquired Assets
          directly to LSB or, in the case of real property
          interests included within the LSB Acquired Assets, to
          LSB's agent, designee or nominee. Subject only to
          execution and delivery of said Asset Purchase Agreement,
          and closing of the transactions contemplated therein.
          LSB unconditionally agrees to pay to Orica a total of ***
          (the "LSB Purchase Price), less the aforementioned
          deposit, in consideration of the assignment of said
          assets.  The LSB Purchase Price shall be adjusted
          downward in the event the actual inventory quantities
          included in the LSB Acquired Assets are less than the
          inventory quantities set forth in Exhibit A to this
          letter agreement.  In the event the actual inventory
          quantities are more than the inventory quantities set
          forth in Exhibit A, LSB agrees to reimburse Orica for any
          amount over the Purchase Price Orica is required to pay
          to LaRoche due to such increase in inventory.

     5.   In consideration of its execution and performance of this
          letter agreement, and for other good and valuable
          consideration, LSB hereby grants, and Orica shall have,
          an option to acquire, with an obligation to physically
          remove from the site , the 550 ton/day Weatherly nitric
          acid plant located at the Crystal City, Missouri site
          (the "Nitric Acid Plant") and the contracts and
          agreements to manufacture, toll or sell industrial grade
          ammonium nitrate priil or solution at or from the Nitric
          Acid Plant (the "AN Contracts") from LSB. Such option
          shall be exercisable, if at all, by the delivery to LSB
          of a written election notice within 365 days of closing
          (the "Option Period") under the Asset Purchase Agreement.
          The parties shall determine a mutually. acceptable date
          of closing of the option transaction, on which date Orica
          shall pay LSB an option exercise price of $150,000.00 in
          consideration of the delivery by LSB of title to and
          possession of the Nitric Acid Plant and AN Contracts,
          free and clear of any liens, claims or encumbrances
          created by, through or under LSB, but not otherwise.
          During the Option Period, LSB shall maintain the Nitric
          Acid Plant, at Orica's expense, in substantially its
          current operating condition.

     6.   Orica and LSB acknowledge and agree that although this
          letter agreement contemplates the purchase by LSB of
          owned and leased real property included in the LSB
          Acquired Assets, LSB shall, subject to the consent of

                                                        Page 2 of 5

***INDICATES INFORMATION IN THIS DOCUMENT WHICH HAS BEEN OMITTED
FROM THIS PUBLIC FILING PURSUANT TO A REQUEST BY THE COMPANY FOR
CONFIDENTIAL TREATMENT BY THE SECURITIES AND EXCHANGE COMMISSION.
THE OMITTED INFORMATION HAS BEEN FILED SEPARATELY WITH THE
SECRETARY OF THE SECURITIES AND EXCHANGE COMMISSION FOR PURPOSES OF
SUCH REQUEST.



          LaRoche, have the right to assign and delegate its rights
          and obligations to acquire such real property to a third
          party, and that of the LSB Purchase Price, $5,000 shall be
          allocated to such real property and paid or reimbursed by
          such third party.

     7.   The factual terms of the letter agreement are
          confidential, and shall not be disclosed by either party
          to a third party without the prior written consent of the
          nondisclosing party.

     8.   This letter agreement shall be interpreted in accordance
          with the laws of the State of Delaware, without regard to
          its conflict of law provisions. The parties agree that
          venue for the resolution of any dispute arising from this
          letter agreement shall be proper in and only in a court
          of competent subject matter jurisdiction in the State of
          Delaware, and the parties each agree to submit to the
          personal jurisdiction of the courts therein.

                                   Sincerely,

                                   ORICA USA INC.


                                   /s/ Milt MacGregory
                                   __________________________
                                   Milt B. MacGregor
                                   VP - Ammonium Nitrate

ACKNOWLEDGED AND AGREED TO:

LSB CHEMICAL CORP.

By: /s/ James L. Wewers
     ______________________________
     James L. Wewers
     President



                                                        Page 3 of 5




                             EXHIBIT A

                            CHEROKEE, AL


                                                          ADJUSTMENT
                                                UNIT OF      PRICE
                                      VOLUME*   MEASURE    ($/UNIT)
                                      ______    _______    _________

Finished Goods and Raw Materials (LaRoche information as of June 30, 2000)

  Ammonia                            1,318.97     Tons        ***
  High Density A.N.                  2,683.38     Tons        ***
  Nitric Acid                          490.30     Tons        ***
  A.N. 83% Solution                  3,152.28     Tons        ***
  A.N. Ammonia Solution                164.70     Tons        ***
  Magnesium Oxide                       99.31     Tons        ***
  Galoryl                                8.33     Tons        ***
  Ammonium Thiosultate                  23.07     Tons        ***
  Inhibitor                              0.75     Tons        ***
  Nitrogen Solution (UAN)            1,590.79     Tons        ***

Stores Inventory             $   ***                         Actual
(LaRoche information as of June 30, 2000)                  Stores Value

Precious Metals
(LaRoche information as of June 30, 2000)

  Platinum                          3,244.76   Troy Ounce     400.00
  Rhodium                             170.78   Troy Ounce     440.00

*Based on quantities and costs associated with the Cherokee Plant as of
June 30, 2000













***INDICATES INFORMATION IN THIS DOCUMENT WHICH HAS BEEN OMITTED FROM
THIS PUBLIC FILING PURSUANT TO A REQUEST BY THE COMPANY FOR CONFIDENTIAL
TREATMENT BY THE SECURITIES AND EXCHANGE COMMISSION.  THE OMITTED
INFORMATION HAS BEEN FILED SEPARATELY WITH THE SECRETARY OF THE SECURITIES
AND EXCHANGE COMMISSION FOR PURPOSES OF SUCH REQUEST.

                                                        Page 4 of 5


                       EXHIBIT A (continued)

                       CRYSTAL CITY, MISSOURI


                                                        ADJUSTMENT
                                              UNIT OF      PRICE
                                    VOLUME**  MEASURE    ($/UNIT)
                                    _______   _______   __________

Finished Goods and Raw Materials (LaRoche information as of June 30, 2000)

     Ammonia                       1,616.95     Tons       ***
     High Density A.N.             5,400.88     Tons       ***
     Nitric Acid                      30.00     Tons       ***
     Nitrogen Solution (UAN)         981.81     Tons       ***
     Lilamin                           4.33     Tons       ***
     Galoryl                           8.00     Tons       ***
     A.N. 83% Solution               805.09     Tons       ***

Stores Inventory           $   ***                         Actual
(LaRoche information as of June 30, 2000)                Stores Value

Precious Metals
(LaRoche information as of June 30, 2000)

     Platinum                         675.99    Troy Ounce   400.00
     Rhodium                           35.58    Troy Ounce   440.00

**Based on quantities and costs associated with the Crystal City Plant as of
June 30, 2000





***INDICATES INFORMATION IN THIS DOCUMENT WHICH HAS BEEN OMITTED FROM
THIS PUBLIC FILING PURSUANT TO A REQUEST BY THE COMPANY FOR CONFIDENTIAL
TREATMENT BY THE SECURITIES AND EXCHANGE COMMISSION.  THE OMITTED
INFORMATION HAS BEEN FILED SEPARATELY WITH THE SECRETARY OF THE SECURITIES
AND EXCHANGE COMMISSION FOR PURPOSES OF SUCH REQUEST.





                                                        Page 5 of 5