Results of six months’ tests of castings of three polyesters and three months’ testing of laminates of the same materials in eight corrodents at 210 F are given. Corrodents were 5 percent nitric, 25 percent sulfuric, 25 percent acetic and 15 percent hydrochloric acids; 5 percent sodium hydroxide, an alkaline detergent, a bleach (5.25 sodium hypochlorite) and distilled water.

Under conditions of the tests, a bisphenol-based polyester has significantly better resistance than a general purpose polyester or an isophthalic polyester. Test data are given in percentage retention of flexural strength, modulus of elasticity and hardness. 3.2

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© 1960 National Association of Corrosion Engineers
1960
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