ASTM WK67162

    Revision of D6878 / D6878M - 17 Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing

    (What is a Work Item?)

    Active Standard: D6878 / D6878M - 19

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



    WK67162


    Keywords

    flexible sheet; roofing; roofing material; single-ply roofing membrane; thermoplastic polyolefin; TPO;;

    Rationale

    Ballot Action:Revision of Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing Rationale:Test Method D573, referenced within section 7.9 Heat Aging (ASTM D6878), is confusing as to the pass/fail criteria (2 of 3, or 3 of 5 specimens) and some of the wording used within the test method is ambiguous. To address these issues, section 7.9 Heat Aging has been edited to clarify that three specimens are to be taken in a row across the width of the sheet, one from the center and one 8 inches from each edge. This sampling provides a better indication of sheet uniformity. The second change defines the pass/fail criteria. Per the proposed requirement, no specimens may display any cracking or weight change above the maximum allowed or the entire test is considered a failure. A similar change was balloted on May 25, 2018 under Ballot Number D08 (18-02) and drew one Negative vote. The suggested wording by the negative voter was incorporated into this ballot.

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    Work Item Status

    Date Initiated:
    02-15-2019

    Technical Contact:
    Randall Ober

    Status:
    Approved