| http://www.w3.org/ns/prov#value | - ASTM D7793 is under the jurisdiction of Subcommittee D20.24 on Plastic Building Products. ???ASTM D7793 provides a uniform basis for producing the siding according to recognized levels of quality and performance, especially with respect to claims for thermal insulation, known as R-value,??? says Dave Johnston, senior technical director, Vinyl Siding Institute, and a D20 member. ???ASTM D7793 will
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