ASTM D4976-12a (2020) pdf free

04-06-2021 comment

ASTM D4976-12a (2020) pdf free.Standard Specification fo olyethylene Plastics Molding and Extrusion Matel.
1.1 This specification provides for the identification of polyethylene plastics molding and extrusion materials in such a manner that the supplier and the user can agree on the acceptability of different commercial lots or shipments. The tests involved in this specification are intended to provide information for identifying materials in accordance with the groups. classes, and grades covered. it is not the function of this specification to provide specific engineering data for design purposes.
1.2 Other requirements necessary to identify particular characteristics important to specialized applications shall he agreed upon between the user and the supplier, by using the suffixes given in Section 1.3.
1.3 Ethylene plastic materials, being thermoplastic. are reprocessable and recyclable (see Note I). This specification allows t’or the use of those ethylene plastic materials, provided that any specific requirements as governed by the producer and the end user are met. N(rrI I—See Guide D7209 for information and definitions related to recycled plastics.
1.4 The values stated in SI units are regarded as standard.
1.5 For information regarding plastic pipe materials see Specification D3350. For information regarding wire and cable materials, see Specification D 1248. Nom 2—There is no known ISO equivalent to this standard.
1 .6 This international .siandard was developed in accordance wit/i internationally recognized principles on standardization established in the Decision on Principles for the Dc’velo,mic’nt of International Standards, Guides and Rc’comisiendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2.1 Definitions—For definitions of technical terms pertaining to plastics used in this specification, see Terminology D883 and Terminology D1600.
2.2 Historical usage and user group conventions have resulted in inconsistent terminology used to categorize and describe polyethylene resins and compounds. The following terminology is in use in ASTM specifications pertaining to polyethylene:
2.2.1 Specification D1248: Type (1. 11. III, IV) = density ranges (same, respectively, as Classes 1, 2. 3, and 4 in Specification D4976). Class (A. B. C, D) = composition and use.
2.2.2 Specification D3350: Type (I. 11, III) = density ranges (same as Types 1. 11. and 111 in Specification D1248 and Classes 1, 2, and 3 in Specification D4976). Class = a line callout system consisting of ‘PE’ followed by six cell numbers from Table I plus a letter (A, B, C, D. E) denoting color and UV stabilizer. Grade = simplified line callout system using “PE” followed by density and slow crack growth cell numbers from Table 1. ASTM D4976 free download.

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