Flex TPO Self Adhered Reinforced Membrane User Manual
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Solar Reflectance Index (SRI) is calculated per ASTM E 1980. The SRI is a measure of the roof's
ability to reject solar heat, as shown by a small temperature rise. It is defined so that a standard black
(reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100.
Materials with the highest SRI values are the coolest choices for roofing. Due to the way SRI is
defined, particularly hot materials can even take slightly negative values, and particularly cool
materials can even exceed 100.
3. Flex TPO membranes conform to requirements of the U.S.E.P.A. Toxic Leachate Test (40 CFR
part 136) performed by an independent analytical laboratory.
4. Flex reinforced TPO was tested for dynamic puncture resistance per ASTM D5635-04 using the
most recently modified impact head 45 mil was watertight after an impact energy of 12.5 J (9.2 ft-
lbf) and 60-mil was watertight after 22.5 J (16.6 ft-lbf).
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