By William Woishnis, Sina Ebnesajjad (Eds.)
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Extra info for Chemical Resistance of Thermoplastics
Significance and Use This test method evaluates the effect of a chemical environment on pipe when in a deflected condition. It has been found that effects of chemical environments can be accelerated by strain induced by deflection. This information is useful and necessary for the design and application of buried fiberglass pipe. Pipe of the same diameter but of different wall thicknesses will develop different strains with the same deflection. Also, pipes having the same wall thickness but different constructions making up the wall may develop different strains with the same deflection.
Elevated temperature testing can also be used as an accelerated technique as a proxy for aging tests. Data obtained from accelerated testing should be carefully analyzed, because time and temperature are not always interchangeable. Testing against gases or at elevated pressures requires more complex equipment. Tests can be carried out on either stressed or unstressed parts. The worst-case-scenario is to test the part under stress as previously discussed in the environmental stress cracking section.
Scope These test methods cover test procedures for synthetic rubber lattices ABR, BR, CR, IIR, IR, NBR, NCR, NIR, PBR, PSBR, SBR, SCR, SIR, synthetic rubber latices having substitute carboxylic acid (COOH) groups on the polymer chain (X), and synthetic rubber lattices that are reinforced (Y). Exceptions to the above are noted in the individual test procedures. The test methods include procedures for sampling, and for determining total solids, volatile unsaturates (residual styrene), pH value, surface tension, viscosity, coagulum, bound styrene, Mooney viscosity, mechanical stability, polystyrene reinforcement in contained polymer, and residual acrylonitrile content.