Why is there no stress relaxation test for PTFE gaskets?

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I read the related standards about the PTFE gasket. But there is no stress relaxation test for the PTFE gasket, could you please tell me the reason? Thanks very much in advance!
 
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maybe my descirption is unclear. my question is how to do the compression stress relaxation test of PTFE gasket? Now I used the teflon gasket for sealing. the PTFE has the aging issue. After 4 years or 6 years, the PTFE gasket may fail due to creeping, whatever. IS there any ASTM standard for this item?
 
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