Changes have been made to the U.S. product standard for TPO roof
membranes that should result in some improvement to their
performance. If you are involved in the design and installation of
TPO roof systems, you should be knowledgeable of these changes and
be aware additional improvements still are necessary.
The U.S. product standard for TPO roof membranes is ASTM D6878,
"Standard Specification for Thermoplastic Polyolefin Based Sheet
Roofing." ASTM International originally published the standard in
2003 and revised it in 2006 and 2008.
This year, ASTM D6878 was revised twice. With the first
revision, which was balloted by ASTM International in April, the
duration of specimen heat aging before aged physical property
testing was increased from 28 days at 240 F to 224 days at 240 F,
an eight-fold increase. The physical property evaluation methods
after heat aging ...
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