ASTM WK43715

    Revision of D4637 / D4637M - 13 Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane

    (What is a Work Item?)

    Active Standard: D4637 / D4637M - 14e1

    Developed by Subcommittee: D08.18 | Committee D08 | Contact Staff Manager



    WK43715

    1. Rationale

    Rationale for Ballot item #1: Within Section 8.15 Dark Oven Heat Exposure, the proposal is to change the term non-black sheet to white sheet since there are only two colors of EPDM on the market today (white and black). The terms black and white, used to describe sheet color, are already used in this standard under section 8.20 Weather Resistance. Rationale for Ballot item #2: The proposal for changing the xenon arc weathering requirement for black membrane to 10080 kJ/m2 @80C / 176F (Black body temperature) is justified since all properly compounded EPDM roofing membranes will conform to this more realistic level of performance. Rationale for Ballot item #3: The visual inspection after xenon arc exposure is to be conducted with the sample under a 10% strain per D518-99 Standard Test Method for Rubber Deterioration Surface Cracking but upon investigation, it was discovered that D518-99 was withdrawn in 2008 and is no longer a valid standard. D4637 also references the bent loop configuration within D518-99 but that method does not define the mandrel diameter where the weathered sample is wrapped prior to inspection under 7x magnification. In order to institute some consistency between single-ply roofing standards, the reference to the 3-inch mandrel is proposed since it is already used in ASTM D6878 (TPO Roofing Membrane). Rationale for Ballot item #4: The second proposal for Section 8.19 is to remove reference to the Percent Retained Fractional Strain Energy (PRFSE) since no other single-ply ASTM standard references such a test and it is not indicative of the roofing membranes ability to resist water intrusion. The removal of PRFSE would be from Section 8.19 as well as Table 1 Physical Requirements for EPDM Sheet


    Keywords

    EPDM; roofing; rubber sheet; single-ply membrane; vulcanized rubber ;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    10-18-2013

    Technical Contact:
    Randall Ober

    Item:
    002

    Ballot:
    D08.18 (13-01)

    Status:
    Negative Votes Need Resolution

    Item:
    003

    Ballot:
    D08.18 (13-01)

    Status:
    Negative Votes Need Resolution

    Item:
    004

    Ballot:
    D08.18 (13-01)

    Status:
    Negative Votes Need Resolution

    Item:
    015

    Ballot:
    D08 (14-02)

    Status:
    Ballot Item Approved as D4637/D4637M-2014 and Pending Publication