ASTM F2968 / F2968M - 20a

    Standard Specification for Crosslinked Polyethylene (PEX) Pipe for Gas Distribution Applications

    Active Standard ASTM F2968 / F2968M | Developed by Subcommittee: F17.60

    Book of Standards Volume: 08.04


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    1. Scope

    1.1 This specification covers outside diameter controlled, metric-sized and inch-sized black or yellow crosslinked polyethylene (PEX) pipe, made in pipe dimension ratios ranging from 6 to 17, and pressure rated for gas distribution. Included are requirements and test methods for material, workmanship, dimensions, burst pressure, hydrostatic sustained pressure, stabilizer functionality, bent-pipe hydrostatic pressure, degree of crosslinking, chemical resistance, minimum operating temperature and squeeze-off. Requirements for pipe markings are also given. The pipe covered by this specification is intended for buried gas distribution and gas transmission pressure piping applications.

    1.2 This specification also includes requirements for joints made between PEX pipe and polyethylene electrofusion fittings (such as Specification F1055). Fittings to be used with PEX pipe manufactured to this specification are in Specification F2829. Installation considerations are in X3.2.

    Note 1: Inch-sized fittings should not be used for metric-sized pipe, and metric-sized fittings should not be used for inch-sized pipe.

    1.3 The text of this specification references notes, footnotes, and appendixes, which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.

    1.4 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

    1.5 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 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents

    D618 Practice for Conditioning Plastics for Testing

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

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

    D1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure

    D1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings

    D1600 Terminology for Abbreviated Terms Relating to Plastics

    D1603 Test Method for Carbon Black Content in Olefin Plastics

    D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings

    D2290 Test Method for Apparent Hoop Tensile Strength of Plastic or Reinforced Plastic Pipe

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

    D2765 Test Methods for Determination of Gel Content and Swell Ratio of Crosslinked Ethylene Plastics

    D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products

    D4218 Test Method for Determination of Carbon Black Content in Polyethylene Compounds by the Muffle-Furnace Technique

    D5596 Test Method for Microscopic Evaluation of the Dispersion of Carbon Black in Polyolefin Geosynthetics

    F412 Terminology Relating to Plastic Piping Systems

    F876 Specification for Crosslinked Polyethylene (PEX) Tubing

    F1041 Guide for Squeeze-Off of Polyolefin Gas Pressure Pipe and Tubing

    F1055 Specification for Electrofusion Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene and Crosslinked Polyethylene (PEX) Pipe and Tubing

    F1563 Specification for Tools to Squeeze-off Polyethylene (PE) Gas Pipe or Tubing

    F1948 Specification for Metallic Mechanical Fittings for Use on Outside Diameter Controlled Thermoplastic Gas Distribution Pipe and Tubing

    F2657 Test Method for Outdoor Weathering Exposure of Crosslinked Polyethylene (PEX) Tubing

    F2829 Specification for Metric- and Inch-Sized Fittings for Crosslinked Polyethylene (PEX) Pipe

    F2897 Specification for Tracking and Traceability Encoding System of Natural Gas Distribution Components (Pipe, Tubing, Fittings, Valves, and Appurtenances)

    Military Standard

    MIL-STD-129 Marking for Shipment and Storage

    Federal Standard

    FED-STD-123 Marking for Shipment (Civil Agencies)

    ISO Standards

    ISO 13477 Thermoplastics pipes for the conveyance of fluids Determination of resistance to rapid crack propagation (RCP) Small-scale steady-state test (S4 test)

    ISO 14531-1

    ISO 14531-2 Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 2: Fittings for heat-fusion jointing

    ISO 18553 Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds.


    ICS Code

    ICS Number Code 23.040.20 (Plastic pipes); 23.100.40 (Piping and coupling); 91.140.40 (Gas supply systems)

    UNSPSC Code

    UNSPSC Code 13111076(Cross linked polyethylene PEX); 40141700(Hardware and fittings)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/F2968_F2968M-20A

    Citation Format

    ASTM F2968 / F2968M-20a, Standard Specification for Crosslinked Polyethylene (PEX) Pipe for Gas Distribution Applications, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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