EXHIBIT A JOINT FILING AGREEMENTJoint Filing Agreement • February 28th, 2007 • Sass Martin D • Industrial organic chemicals
The undersigned hereby agree that the statement on Schedule 13D, Amendment No. 6, with respect to the Common Stock of Sterling Chemicals, Inc. dated as of February 28, 2007 is, and any amendments thereto (including amendments on Schedule 13G) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.
