| http://www.w3.org/ns/prov#value | - In general, if the flexible sheet 148 that is to be laser resistant, it may comprise a material such as ePTFE, PTFE, tetrafluoroethylene (TFE), fluorinated ethylenepropylene (FEP), perfluoroalkoy (PFA), ethylene tetrafluoroethylene (ETFE), polyvinylidene fluoride (PVDF), etc.
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