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be electrochemically tested. Their use should now be expanded into fully opera tional battery systems. Only long term, in-service use of these materials finally can qualify them. However, it is of primary concern that only specified materials be employed and that they are properly fabricated and implemented for the intended use. Records should be maintained of how and where these new materials are intro duced into future systems. It is expected that use of these alternate materials will bring about design and engineering changes in the components affected. Table 33-2 was prepared to assist in an orderly changeover. It compares the mechanical and thermal properties of potential compounds with more familiar materials. COST Vfe resin MECHANICAL PROPERTIES Specific Gravity ASTMD-792 jsi: Mold Shrink in/in Tensile Strength ASTM 0-638; 36*C; psi Flexural Modulus ASTM D-790;34°C; psi FlexuraiSIrengih ASTMO-790;psi Compressive Strength ASTM D-695;36BC; psi fjod Impact Resistance ASTM D-256; notched THERMAL PROPERTIES 65-80 iiiiliiilliil 65 (Sarcol) Heat Distortion Temp. ASTM 648; 66 psi 118°C Self-extinguishing Nonflammable touee 0.001 -0.005 6,000 - 7,500 3.7x105 8,000 - 1 3,000 77°C Self-extinguishing Electrochemtcaf Evaluation 0.001 -0.004 11.500 8.6x105 18,000 22,000 7.0 1 77 - 236°C (264 psi) 2.0x10-5 Flammable Eiectrochemlcal Evaluatton 0.02-0.05 3,300 1.7x105 2,700-3,600 2.0 73“C 12x10-5 Flammable Development ASTM0-896 Flammability STATUS in/inTC a SOURCE: Modern Plastics Encyclopedia except as noted a Chemical Marketing Reporter Feb. 27, 1978 b DuPont c Pennwalt Table 33-2 PROPERTIES OF POTENTIAL ZnClg BATTERY MATERIALS Polyvinylidene fluoride c KYNAR® Case Material Structural Members $5.50 1.70-1.78 0.030 1.7x105 8,680 Polyvinylchloride (bulk & suspension resins) PVC Case Material Structural Members ?- 1.30 - 1.58 Unsaturated Polyesters (+ 25% glass) FRP Case Material $0.36 (No Glass) 1.66-2.10 High Density POLYETHYLENE Case Material Structural Members Tubing $0.31 0.95 Elastomer b VITON® Gaskets, Seals ‘O’Ring $13.00 (Raw Resin) 1.88 80 Shore A 0.025-0.035 >71,200 600 60 ASTM D-575 283*C 8.8x10-5 Flame resistant development Tetrafluorindated ethylene TEFLON® Tubing $5.00 2.14-2.20 (extruded) 2,000-5,000 Oid not break 1,700 X<:' 127 - 1 420C . ThermalCoefficientofExpansion ;|553,5|sie-51j.:v..y 10x10-5 APPLICATIONS 33-15PDF Image | Development of the Zinc-Chlorine Battery for Utility
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