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.
