Under accelerated testing methods, like ASTM G53 (QUV), a good polymer compound should be capable of sustaining 10,000 hours of exposure without crazing, cracking or displaying any loss of hydrophobicity. However, loss of hydrophobicity does not indicate the end of life for a polymer compound. The test results obtained from the QUV test provide a means of comparatively ranking the UV resistance of materials. Such results are listed in Table 2