ASTM WK39017

    New Specification for Plastic Composite Decking Boards and Guardrail Systems, Including Guards and Handrails

    (What is a Work Item?)

    Developed by Subcommittee: D20.20 | Committee D20 | Contact Staff Manager


    1. Scope

    1. Scope 1.1 This specification covers the procedures for establishing the performance of plastic composite products for use as exterior decking boards. This specification also covers the procedures for establishing the performance for plastic composite products for use as guardrail systems, including guards and handrails. 1.2 The purpose of this specification is to establish the basis for code recognition of these products or systems in exterior applications where combustible construction is allowed. 1.3 Plastic composite products include plastic lumber products and wood-plastic composite products. Plastic lumber products are currently made predominantly with recycled polyolefin plastics (in particular high-density polyethylene) where the products are more or less non-homogenous in the cross-section. Wood-plastic composite products are primarily made from wood or cellulosic materials (including various lignocellulosic materials) and plastics. However, this specification is also potentially applicable to similar manufactured plastic products made from other plastic and plastic composite materials that have non-homogenous cross-sections. 1.4 Deck boards, guards, and handrails covered by this specification are permitted to be of any code compliant shape and thickness (solid or non-solid). 1.5 A deck board, and a deck board used as a stair tread, are assigned a span rating indicating its ability to comply with model code specified functions identified for its specific end use. A guard or handrail is recognized for its ability to meet minimum code requirements specified in the appropriate model code. 1.6 Details of manufacturing processes are potentially proprietary and are beyond the scope of this specification. 1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. However, the units stated for irradiance exposure in the weatherability section (7.3) are in SI units as these are the units commonly used for testing of this type. 1.8 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. NOTE 1 -There is no similar or equivalent ISO Standard.

    No specification exists that encompasses in its scope both plastic lumber and wood-plastic composites.


    adjustment factor; deck board; guard; handrail; plastic composite; plastic decking; plastic lumber; recycled plastic; span rating; stair tread; wood-plastic composite

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

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Marcelo Hirschler

    Draft Under Development