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and etching of the surface upon exposure to chlorinated zinc chloride. Seven more adhesive compounds were evaluated during 1977 with the concept of glued electrodes in mind. None of these new adhesives appeared to be sufficiently more stable in chlorinated zinc chloride than the Lucite adhesive previously evaluated. Some studies were conducted on ceramic-type compounds, but were not pursued to any great extent at this time due to the high-level leaching of numerous elements (Mg, Fe, Si, Pb) into solution. A graphite fiber cloth (G-16) was tested for use as filler in a polyester resin. This material was in a woven fiber-mat form. There did not appear to be any notable physical degradation of the graphitecloth. A graphite gasket tape material (G-18) also was evaluated. The pressed graphite appeared to bubble up and to expand some what. Definite weight increases were noted, but little leached contamination was observed. The present use of Kynar and Teflon as battery components has made it continually necessary to evaluate various types and compositions of these two relatively stable compounds. Numerous formula variations of each have been evaluated. A Kynar-encapsulated stainless steel rod (K-5) was evaluated but inconsistent data was recorded due to the inability to seal off the exposed stainless steel end. A Kynar-glass laminate showed a definite weight loss and excessive leaching of iron, chromium, magnesium, silicone, and calcium. A Kynar filter screen appeared quite inert in chlorinated zinc chloride, compared to a polypropylene filter screen. Halar (E-CTFE) was considered as a laminate despite its relatively high cost. A Halar film sample (Te-5) was screened extensively at both 25°C and 50°C. These tests indicate that Halar is relatively stable in chlorinated zinc chloride. Only at 50°C did the surface become slightly etched. A Halar coated fiberglass (Te-10) appeared quite stable in the test environment. Numerous fluorocarbon materials have been evaluated as possible filter cloth mate rials. Presently Armalon* is being used as a filter material in the hydrate store. Bleaching of the brown color is noted but no ill effects or further degradation have been encountered. Nonetheless, alternates showing no change were pursued. A low-cost substitute for Armalon* was qualified for use as a filter cloth. DISCUSSION The plastic materials qualification program of Phase I has added two polyvinyl chlorides (PVC) and a glass-reinforced polyester compound to the list of approved construction materials for zinc-chlorine batteries. These materials continue to *DuPont Trademark 33-14PDF Image | Development of the Zinc-Chlorine Battery for Utility
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