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PTFE Thermal Stability ?
2

PTFE Thermal Stability ?

PTFE Thermal Stability ?

(OP)
Can anyone advise on the thermal and mechanical stability of PTFE at temperatures above 300C. Data sheets that I have seen, give the upper working temperature of the material to be 260C with a (Theoretical??) melting point of  327C. Dose the material melt? And does it give off any toxic fumes above the recommended upper working temperature.

Thanks in advance

Q

RE: PTFE Thermal Stability ?

The generic PTFE has a melt point of 327°C according to the literature, but you need to be more specific.  Look at DuPont's website to see how many variations of "Teflon" there are.  Most of theirs have a melt temp of 302°C.  I used some PTFE (or FEP) sheeting to make some cylindrical alignment collars a few years ago, and I got the material to flow at 150°F.  It didn't take much to soften.

You need specific info on the PTFE (in particular manufacturer and their designation) to find the elevated temperature properties.  Literature list hydrogen fluoride as a decomposition product of fire.  

RE: PTFE Thermal Stability ?

You anwser is that Teflon (PTFE) has a 90% declination of mechanical properties at 260 C. The modified PTFE (TFM) has a slightly better declination rate about 83 % at 260 C. The material doe not flow at elavated temperature like a typical thermoplastic,
howver any load will cause cold flow or extrusion of the material.

Good Luck,

WMV

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