Weathering test is all about exposing a material to different real world conditions such as dry weather humid weather & UV light. Hygrothermal is related to moisture and heat I guess. But what exactly is the difference ?
1. polymers respond different to UV and moisture+ temperature. E.g. good UV resistance but not good moisture+temperature
2. the testing methods are different
3. the stabilising systems are different. If you have added to the polymer a UV-stabiliser may your problem is solved, but the same stabiliser maybe can not help bei higher humidity
4. a big issue is hot/wet
pay also attention to the migration of plasticizers, antioxidants ... which maybe different according ot the exposure conditions
Your question & comment really include the answer. Both “weathering test & hygrothermal ageing” will expose a material to imposed conditions or an outside effect to see how it will respond.
Before using the plastic poly (methyl methacrylate) in display signs, PMMA was subjected to weathering tests and it was found to be durable.
The elastomer, used in rubber inflatable boats, was subjected to hygrothermal ageing test to see its response towards water, moisture, humidity at various temperatures.
The particular function of a selected material calls for the proper test to be applied on it.
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