1 Aging and Hail Research of PVC Membranes Frank J. Foley, Jim ...
1 Aging and Hail Research of PVC Membranes Frank J. Foley, Jim ...
1 Aging and Hail Research of PVC Membranes Frank J. Foley, Jim ...
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UV Factored<strong>Aging</strong>Group A, 20 Samples Group B, 21 Samples Group C, 25 Samples Group D, 21 SamplesSmallSmallSmallAnyAnyAny Small Sphere AnySphereSphereSphereFailureFailureFailure Failure FailureFailureFailureFailureTo 3.5 years 0 0 8 2 0 0 0 03.51 - 7.00 3 1 10 10 5 0 3 07.01 - older 6 5 3 3 6 3 5 0% By WeightExposedPlasticizerContent24% <strong>and</strong> less 2 2 13 12 1 0 NA NA24.1 - 28% 4 2 7 2 5 3 1 028.1 - 32% 2 1 1 1 5 0 5 0Over 32.1% 1 1 NA NA 0 0 2 0Table 9: Simulated hail results, by group, by size category, according to age <strong>and</strong> plasticizercontentGroup D contained no samples where the exposed plasticizer content measured 24% orless. In relation, group B had no samples where the plasticizer content was greaterthan 32.1%. Thus, “NA” was used within these two group summaries.Table 10 presents a view <strong>of</strong> the total grouping <strong>of</strong> all tested conventional plasticizersamples. The summarization <strong>of</strong>fers a benchmark between the two categories <strong>of</strong> age<strong>and</strong> plasticizer content -- the isolation <strong>of</strong> group B <strong>and</strong> D results. The summary results <strong>of</strong>all 87 tested membranes are skewed by the results <strong>of</strong> these two groups, group D as themost resistant to failure, group B as the least <strong>and</strong> the results <strong>of</strong> groups A <strong>and</strong> C lyingbetween B <strong>and</strong> D.17