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Plastics to Chemical Reagents. If a material was satisfactorily inert in this initial test, electrochemical evaluation was pursued within an electrochemical cell. An outline of the screening test and the electrochemical test follows. Screening Tests The American Standard Testing Method D543, Test for Resistance of Plastics to Chemical Reagents, was used as a model in setting up a system to screen a large number of materials. A set of test parameters was selected and maintained through out this degradation testing in order to produce comparable data. were performed using the system shown in Figure 33-1. Screening tests CHLORINE GAS CYLINDER FLOW METER GAS GAS TRAP WASH BOTTLE THERMOMETERS HOT PLATES WITH MAGNETIC AGITATOR VENT TO HOOD AGITATOR Figure 33-1. Diagram of laboratory system used for initial chemical screening tests. Note that sample bottles are arranged in series. Standard testing parameters were selected with regard to the various conditions of batteryoperation. Allplasticswereviewedmicroscopicallyandphotographedprior to any degradation studies. Initially, all test specimens were exposed to chlori nated zinc chloride (30% solution, pH 1.0) for ^30 days at ambient temperature. Whenever the specimens and their test solutions appeared unaffected by this initial exposure, the temperature was increased to 50°C and the tests continued for an ex tended period of time. 33-3PDF Image | Development of the Zinc-Chlorine Battery for Utility
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