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INTRODUCTION Section 33 SELECTION AND QUALIFICATION OF PLASTICS Plastics are used in the zinc-chlorine (ZnCl^) battery system for the battery case, electrode frames, pipes, masks, and manifold components. Continuing efforts are being made to specify materials that resist the corrosive chlorine environment and that do not release detrimental contaminants into the battery electrolyte. The criterion for qualifying plastics materials for use in battery fabrication is based on three primary factors: 1. The chemical properties of the material, i.e. additives, elemental analysis 2. The physical properties of the material, i.e. flexural and tensile strengths 3. The economics, i.e. material and fabrication costs to produce end-item components for the battery system During 1977, areas of study were channeled into the evaluation and specification of explicit generic groups. Extensive work was performed to develop a stable polyvinyl chloride formulation. In fact, two polyvinyl-chloride compounds have been found which appear inert in a chlorinated zinc chloride environment. Presently, both are undergoing electrochemical evaluation for extensive use in battery fabrication. Several advantages could be gained by using polyvinyl-chloride (PVC) instead of the Kynar (polyvinylidene fluoride) currently used. Of utmost importance is the drastic reduction in material cost. This factor is reinforced by the fact that PVC can be solvent-bonded very satisfactorily, machines much more easily than Kynar, and ex hibits less cold flow characteristics. Numerous polyester formulations have been evaluated. A specific resin with speci fied glass components was found to be stable in the screening test system. The specified polyester formulation presently is being electrochemically evaluated in the materials cycling cells, but results are not conclusive yet. The development 33-1PDF Image | Development of the Zinc-Chlorine Battery for Utility
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