ASTM WK57078

    New Specification for MRS-Rated Metric- and Inch-Sized Cross-Linked Polyethylene (PEX) Pipe

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    Developed by Subcommittee: F17.26 | Committee F17 | Contact Staff Manager


    1. Scope

    1.1 This specification covers cross-linked polyethylene (PEX) pipe that is outside diameter controlled in metric pipe sizes (DN 16 to 1000) and inch pipe sizes (NPS 3 to 54) and pressure rated using the MRS rating system. This specification is only applicable to peroxide PEX and silane PEX. Included are requirements and test methods for material, workmanship, ultraviolet (UV) stability, dimensions, hydrostatic sustained pressure, environmental stress cracking, stabilizer functionality, bent-pipe hydrostatic pressure, oxidative stability in potable chlorinated water, minimum operating temperature, and degree of cross-linking. Requirements for pipe markings are also given. The pipe covered by this specification is intended for pressure-piping applications such as industrial and general-purpose pipelines, potable water pipelines, fireextinguishing pipelines, and chemical pipelines. 1.2 The text of this specification references notes, footnotes, and appendixes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification. 1.3 The pipe dimensions (outside diameter and wall thickness) in this specification are for both inch-sized (NPS) and metric-sized (DN) pipe. All other values stated in this specification are in SI units. 1.4 Fittings are not part of the scope for this specification. Note 1--Fittings to be used with PEX pipe manufactured to this specification are in Specification F2829. Inch-sized fittings should not be used for metric-sized pipe, and metric-sized fittings should not be used for inch-sized pipe. 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.


    cross-linked polyethylene; MRS; CRS; design stress; PEX

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Eugene Palermo


    F17.26 (18-08)

    Negative Votes Need Resolution