We have an old drawing that calls for the material to be:

MIL-P-13949/7 (non-woven glass (GR) and polytetrafluoroethlyene resisn) for 
MICROWAVE applications; p/n GRN0310B1/B1B1C

I cannot find a direct sub when looking through the IPC4101 slash sheet 
index.  Can anyone tell me what material is used today for this requirement?

Thanks.

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