1 Aging and Hail Research of PVC Membranes Frank J. Foley, Jim ...

SampleNo.State( A ) ( B ) ( C ) ( D ) ( D/B ) ( D/A )UV-FactoredAge of RoofHidden FlapPlasticizerContent, %ExposedMembraneContent, %%Lost%ChangedPlasticizerLoss byUV YearFailurePoint, Sizein Inches1 OK 11.14 34.3 27.7 6.6 19.24 0.592 2.52 TX 9.92 33.6 30.8 2.8 8.33 0.282 no failure3 TX 9.32 33.0 30.1 2.9 8.79 0.311 3.04 CO 7.84 33.1 33.1 0.0 0.00 0.000 3.05 TX 7.31 34.5 31.7 2.8 8.12 0.383 3.06 KS 7.13 33.0 31.2 1.8 5.45 0.252 2.57 KS 6.95 33.0 31.4 1.6 4.85 0.230 2.58 TX 6.51 36.0 33.7 2.3 6.39 0.353 3.09 OK 6.47 35.1 32.4 2.7 7.69 0.417 no failure10 TX 6.01 36.4 34.6 1.8 4.95 0.300 no failure11 NE 5.80 34.3 32.6 1.7 4.96 0.293 no failure12 IA 5.76 34.6 31.4 3.2 9.25 0.556 3.013 CO 5.75 36.4 36.2 0.2 0.55 0.035 no failure14 TX 5.71 35.7 35.7 0.0 0.00 0.000 no failure15 TX 5.51 35.6 35.0 0.6 1.69 0.109 no failure16 IA 5.28 33.3 33.2 0.1 0.30 0.019 no failure17 TX 4.27 36.0 35.4 0.6 1.67 0.141 no failure18 IL 3.66 36.2 36.2 0.0 0.00 0.000 no failure19 TX 2.50 36.5 36.5 0.0 0.00 0.000 no failure20 MN 2.24 36.2 36.1 0.1 0.28 0.045 no failure21 IA 2.03 36.1 36.1 0.0 0.00 0.000 no failureMean Summaries: 6.05 34.90 33.39 1.51 4.34% 0.248Table 12: Group D test results-- plasticizer loss and hail simulation (all samples)The data comparison of samples from group B and group D reveal dramaticperformance differences in the hail simulation testing. All of group B membranes failed.Group B membrane samples 16 and 18 were newer than three years old but fracturedwith ice spheres as small as 1-inch (25 mm). In consideration, no testing was madewith spheres less than 1-inch (25 mm) in diameter. Therefore, understandably the 1/4inch (12 mm) ice (or large sleet) might have damaged the membrane. On the otherhand, the hail simulation testing for group D indicates a vast difference in impactperformance.20