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Abbreviation Name PVAC poly(vinyl acetate) PVAL poly(vinyl alcohol) PVB poly(vinyl butyral) PVC poly(vinyl chloride) PVDC poly(vinylidene chloride) PVDF poly(vinylidene fluoride) PVF poly(vinyl fluoride) PVFM poly(vinyl formal) SAN styreneacrylonitrile S/B styrenebutadiene S/MS styrene-α-methylstyrene SMA styrenemaleic anhydride VC/E See VCE VC/MMA See VCMMA VC/VDC See VCVDC VC/VAC See VCVAC VC/MA See VCMAK VC/OA See VCOAK VC/E/MA See VCEMAK VC/E/VAC See VCEVAC VCE vinyl chloride-ethylene (was VC/E in ISO) VCEMAK vinyl chloride-ethylene-methyl acrylate (was VC/E/MA in ISO) VCEVAC vinyl chloride-ethylene-vinyl acetate (was VC/E/VAC in ISO) VCMAK vinyl chloride-methyl acrylate (was VC/MA in ISO) VCMMA vinyl chloride-methyl methacrylate (was VC/MMA in ISO) VCOAK vinyl chloride-octyl acrylate (was VC/OA in ISO) VCVAC vinyl chloride-vinyl acetate (was VC/VAC in ISO) VCVDC vinyl chloride-vinylidene chloride (was VC/VDC in ISO) The above abbreviations may be modified by the addition of up to four speci- fied letters after the abbreviation for the polymer under discussion. For exam- ple, PS could become PS-HI when high impact polystyrene is being described. In the case of PE, this would become PE-LD when low-density polyethylene (LDPE) is being described. When mixtures are made from two or more polymers (blends or alloys), ISO 1043 suggests that the symbols for the basic polymers be sepa- rated by a plus (+) sign and that the symbols be placed in parentheses. For example, a mixture of * polymethyl methacrylate and * acrylonitrile-butadiene- styrene should be represented as (PMMA+ABS) When a copolymer is being discussed, it is recommended (ISO) that an oblique stroke / be placed between the two monomer abbreviations. (For example, E/P for an ethylene propylene copolymer.) The oblique strokes may be omitted when common usage so dictates according to ISO 1043- 1:1987 (E). ➤ THERMOPLASTIC MATERIALS Over the past 50 years the usage of plastic materials throughout the world has increased dramatically and now stands at well over 100 million tons. In terms 19 section 2: introduction to extrusionPDF Image | Dynisco Extrusion Processors Handbook
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