7 August

ASTM D412 is the wrong test for sheet products

Many manufacturers of sheet flashings, air/vapor barrier and waterproofing products report test results using test method ASTM D412.  This is a misleading test, to say the least, for sheet membrane products. 

ASTM D412 gives test results in PSI (pounds per square inch).  While it is a useful test for characterizing solid rubber or elastomeric materials, sheet materials should use tests that measure PLI (pounds per inch).  Here's why.

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