Nylon, PTFE, RPTFE, Devlon & PEEK.  Some sites will include many plastics that you should consider.  You will find lots.  Consider a few thoughts beyond the valve manufacturer.
The plastic manufacturer provides most data to sell their product.  PEEK is good for continuous service up to about 480 degree F.  Go to the Victrex site for PEEK, Dupont for PTFE, etc.  Look for the trade name like Nylon and the generic like polyamide.  Isn’t Devlon a modified polyamide?  Also obtain data from other plastics companies who may take the basic components like PTFE to make the glass reinforced PTFE.  For some trade names it may be difficult to identify the generic.  Isn’t  Kel-F a.k.a. PCTFE or polytetra chorotri fluoroe thylene but requiring spelling correction?
You may also find standards that exist such as BS6564 for carbon reinforced PTFE.  Most of the material standards apply to the metals.  Fewer standards apply to soft goods.

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