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time, insufficient consistent data has been obtained to form firm conclusions. No definite baselines can be yet established for the control, thus it is not possible to attribute day-to-day variations in cell operations to any one of the materials in test. In order to account for future commercial needs for the zinc-chlorine battery, injection-molding and vacuum-forming compounds of this same PVC formulation have been ordered. An increase in the stabilizer and an addition of lubricant to the formulation will be necessary for an injection-molded compound. Necessary in jection-molding data has been requested. Extruded test samples of this slightly different material have been requested and received. Welding rod for bonding and Schedule 80 pipe (1" and 2") and fittings are available in-house. In order to assure proper fabrication of injection-molded and vacuum-formed parts, manufac turer’s representatives will be asked to supervise initial fabrication efforts. POLYESTER Glass-reinforced polyester is another low cost material that has been developed. Numerous resin types, including vinyl esters, were evaluated. A corrosion-re sistant resin was found to be the most stable polyester in the battery environment. The importance of the glass-reinforcing component is also recognized. Various glasses have been examined to determine their physical and chemical resistance characteristics. From the screening test and electrochemical test data acquired to date, a specified polyester resin and glass composite has been formulated. Due to the unique composition of glass and resin in a polyester laminate, different modes of degradation were observed in these compounds. There are five main corrosion mechanisms seen in polyester formulations: 1) Blistering - polyester resins usually exhibit macroscopic raises in the surface unlike the microscopic blistering observed in most other generic resin types. 2) Delamination - separation of resin and glass layers. 3) Discoloration - a brown or charred-black discoloration is most common; may be a thermal or chemical reaction. 4) Wicking - flaking of resin due to seepage of water molecules into the resin along the fibers; appears as microscopic pin holes on the surface with flaking in the generalized area. 5) Resin attack - physical breakdown of resin; may appear as tiny blisters. 33-9PDF Image | Development of the Zinc-Chlorine Battery for Utility
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