Hexane Comparison

Samples of each membrane are cut and weighed, immersed in the chemical for seven days at 73° F (23° C), removed, cleaned and re-weighed.

Reported values reflect change in weight after the seven day exposure, as measured at 15 minutes and 24 hours after removal.

Test Results

	15 min. after removal	24 hrs. after removal
Fibertite®	-3.0%	-8.6%	No Change
PVC #2	-12.1%	-14.8%	Stiff
PVC #1	-12.7%	-19.6%	Curling Stiff
PVC #3	-14.3%	-20.6%	Very Slight Curling Stiff
NBP	-11.9%	-21.4%	Curling Stiff
CPA	-14.0%	-22.4%	Curling Stiff
PVC #4	-14.5%	-23.0%	Very Slight Curling Stiff

Testing simulates the effect of chemical contamination on a roofing membrane.

Changes in weight gain or loss illustrate the extent of a roofing membrane's ability to resist exposure to a chemical contaminant.

Weight loss is associated with plasticizer extraction or the loss of other compound additives.

Weight gain is indicative of a contaminant's ability to permeate the membrane causing swelling and/or softening of the compound.

Test Results for Resistance to Chemical Contaminants as Performed and Reported by Structural Research, Inc.