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    ASTM D4976 - 12a

    Standard Specification for Polyethylene Plastics Molding and Extrusion Materials

    Active Standard ASTM D4976 | Developed by Subcommittee: D20.15

    Book of Standards Volume: 08.02

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    Abstract

    This specification provides the standard requirements for polyethylene plastic molding and extrusion materials. The tests involved in this specification are intended to provide information for identifying materials in accordance with the groups, classes, and grades covered. Polyethylene plastic materials are classified into two groups in accordance with the molecular structure which may be branched or linear. Test specimens shall be compression molded, conditioned in a standard or controlled laboratory atmosphere, and tested to determine the materials' physical and electrical properties. The specimens shall comply with the following requirements: flow rate; density; tensile stress at yield; nominal strain at break; secant flexural modulus; environmental stress-crack resistance; slow crack growth resistance; thermal stress crack resistance; permittivity; dissipation factor; volume resistivity; water immersion stability; flammability; and weatherability.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    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 be 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 1). This specification allows for the use of those ethylene plastic materials, provided that any specific requirements as governed by the producer and the end user are met.

    Note 1—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 The following precautionary caveat pertains to the test method portion only, Section 12, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    1.6 For information regarding plastic pipe materials see Specification D3350. For information regarding wire and cable materials, see Specification D1248.

    Note 2—There is no known ISO equivalent to this standard.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D257 Test Methods for DC Resistance or Conductance of Insulating Materials

    D568 Method of Test for Burning and/or Extent and Time of Burning of Flexible Plastics in a Vertical Position

    D618 Practice for Conditioning Plastics for Testing

    D635 Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position

    D638 Test Method for Tensile Properties of Plastics

    D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

    D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement

    D883 Terminology Relating to Plastics

    D1238 Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer

    D1248 Specification for Polyethylene Plastics Extrusion Materials for Wire and Cable

    D1499 Practice for Filtered Open-Flame Carbon-Arc Exposures of Plastics

    D1505 Test Method for Density of Plastics by the Density-Gradient Technique

    D1531 Test Methods for Relative Permittivity (Dielectric Constant) and Dissipation Factor by Fluid Displacement Procedures

    D1600 Terminology for Abbreviated Terms Relating to Plastics

    D1693 Test Method for Environmental Stress-Cracking of Ethylene Plastics

    D2565 Practice for Xenon-Arc Exposure of Plastics Intended for Outdoor Applications

    D2839 Practice for Use of a Melt Index Strand for Determining Density of Polyethylene

    D2951 Test Method for Resistance of Types III and IV Polyethylene Plastics to Thermal Stress-Cracking

    D3350 Specification for Polyethylene Plastics Pipe and Fittings Materials

    D3801 Test Method for Measuring the Comparative Burning Characteristics of Solid Plastics in a Vertical Position

    D3892 Practice for Packaging/Packing of Plastics

    D4000 Classification System for Specifying Plastic Materials

    D4329 Practice for Fluorescent UV Exposure of Plastics

    D4703 Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets

    D4804 Test Method for Determining the Flammability Characteristics of Nonrigid Solid Plastics

    D4883 Test Method for Density of Polyethylene by the Ultrasound Technique

    D4986 Test Method for Horizontal Burning Characteristics of Cellular Polymeric Materials

    D6360 Practice for Enclosed Carbon-Arc Exposures of Plastics

    D7209 Guide for Waste Reduction, Resource Recovery, and Use of Recycled Polymeric Materials and Products

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E1354 Test Method for Heat and Visible Smoke Release Rates for Materials and Products Using an Oxygen Consumption Calorimeter

    F1473 Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins

    Military Standard

    MIL-STD-105 Sampling Procedures and Tables for Inspection by Attributes

    ICS Code

    ICS Number Code 83.080.20 (Thermoplastic materials)

    UNSPSC Code

    UNSPSC Code 13111016(Polyethylene)

    Referencing This Standard
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    DOI: 10.1520/D4976-12A

    Citation Format

    ASTM D4976-12a, Standard Specification for Polyethylene Plastics Molding and Extrusion Materials, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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