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Tham khảo tài liệu 'plastic product material and process selection handbook part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 124 Plastic Product Material and Process Selection Handbook Although there are literally thousands of plastics available usually no single one will exhibit all desired properties in their proper relationships. Therefore a compromise among properties cost and fabricating process generally determines the material of construction. There is a logical workable elimination approach to the selection of the correct plastic. Examples among the specific properties have been reviewed in this chapter that include chemical resistance Table 2.12 color crazing cracking electric electronic flame resistance impact odor taste radiation temperature resistance Figure 2.7 permeability Table 2.13 transparency Figure 2.8 and Table 2.14 weathering Figure 2.9 moisture etc.1-3 6 133 134 367 368 426 -273-253 -233-213-193 -173 -153 -133 -113 -93 Temperature c Figure 2.7 Examples of plastic contraction at low temperatures 2 Plastic property 125 Table 2.12 Chemical resistance of plastics courtesy of Plastics FALLO MATERIAL n 200 rr 200 T 200 n 200 77 200 77 200 77 200 TĨ 200 Change by weight Aeatal 1 4 2-4 1 2 -2 4 3 2-5 -5 2-5 5 5 3 s 1 2-3 0.22-0-25 Acrylic 5 5 2 3 5 5 1 3 2 5 4 4-5 5 s 5 Ỉ 0.2-0.4 Acrytenltclla-Butedtana-styrane ABS 4 5 2 3-5 3-5 5 1 24 1 2-4 14 5 1-s 5 3-5 5 0.1 -0.4 Cellulose Acetate CA 2 3 2 3 3 4 2 3 3 6 3 6 3 5 5 5 2-7 Canutes Acetate Propionates CAP 4 5 1 3 3 4 1 2 3 5 3 5 3 s 5 s 13-23 Diallyl Phthalates DAP filled -2 2-4 2 3 2 4 2 3 2 4 1-2 2-3 2 4 M 4-5 0.2-0.7 Epoilw 1 2 1 2 1-2 3-4 1 1-2 1 2 -3 M 4 4-5 2 34 O01 -0.10 Ethylene Copolymer IVA Ethytene-Vinyl Acetates 5 5 5 5 5 5 1 2 1 5 1 5 1 Ĩ 2 5 0.05-0.13 Ethytene Tatrafluoro- athytena Copolymere ITFE 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.03 s Fluorinated Ethylene Propylenes FEP 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.01 1 Perfluoroalkoxies PFA 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.03 I u. Pofychlorotrlttuoro-ethytenea CTFE 1 1 1 1 3 4 1 1 1 1 1 1 1 1 1 1 001-0.10 PolytetrafluoroethyUine TFE 1 1 1 Ỉ 1 1 1 1 1 1 1 1 1 1 1 1 0 .
