Micom Laboratories just added a new offering to its test arsenal: ASTM D4799 standard as part of its UV testing and material testing services. This method describes the procedure and the test conditions required for evaluating the weathering characteristics of bituminous roofing and waterproofing materials. More specifically, those attributes are assessed through the employment of UVA lamps. Lastly, in order to appraise changes in chemical and in mechanical properties of the sample, this method has to be paired with another standard.
ASTM D4799 test
The goal of ASTM D4799 is to supply the test conditions, and the procedure needed for an accelerated weathering test which will assess the weathering characteristics of bituminous substances through the use of UV testing. More specifically, it is by exposing the sample to a structured cycle composed of segments of UV radiation and condensation that it is possible to induce, on an accelerated basis, property changes in the specimen. These latter are either appraised visually by comparing the unexposed sample with the exposed one or with another test protocol following the exposure. Furthermore, it is possible to compare its performance towards a material of known characteristics by testing them concurrently. Lastly, it is important to mention that this test protocol does not establish a correlation between the natural and the accelerated weathering of the material, because there is a great variation of many parameters of the atmosphere. Indeed, it is not possible to define a proper acceleration factor, because the latter is sensitive to the formulation used in the sample.
Micom offers polymer testing services for a wide selection of material and products. For more information about the ASTM D4799 test, we invite you to contact our material testing laboratory today. It will be our pleasure to answer your questions about either of those tests.
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