1. A CONTAINER HAVING RESISTANCE TO HYDROCARBON MATERIALS, AS MEASURED BY ASTM METHOD D-471-59T OF LESS THAN 25 PERCENT VOLUME CHANGE FORMED OF A POLYURETHANE HAVING AN ELONGATION IN EXCESS OF 200 PERCENT AT -65*F., SAID POLYURETHANE BEING THE REACTION PRODUCT OF A 1. 1.25 TO 2.5 MOLS OF AN ORGANIC POLYISOCYANATE CONTAINING ESSENTIALLY TOLUENE DIISOCYANATE WITH 2. 1 MOL OF A HYDROXYL TERMINATED POLYESTER WHICH COMPRISES AT LEAST 20 WEIGHT PERCENT OF A TETRAMETHYLENE AZELATE HAVING A MOLECULAR WEIGHT OF ABOUT 800 TO 3000 AND ABOUT 80 TO 0 WEIGHT PERCENT OF A TETRAMETHYLENE PATE HAVING A MOLECULAR WEIGHT OF ABOUT 800 TO ABOUT 3000, AND 3. 0.5 TO ABOUT 0.9 MOLS OF A DIAMINE FOR EACH MOL OF POLYISOCYANATE IN EXCESS OF THAT EQUIVALENT TO THE HYDROXYL TERMINATED POLYESTER.

2. 1 mol of a hydroxyl terminated polyester which comprises at least 20 weight percent of a tetramethylene azelate having a molecular weight of about 800 to 3000 and about 80 to 0 weight percent of tetramethylene adipate having a molecular weight of about 800 to about 3000, and

3. 0.5 to about 0.9 mols of a diamine for each mol of polyisocyanate in excess of that equivalent to the hydroxyl terminated polyester.