PTFE examples of tensile stress and modulus retentions versus temperature C

For long-term heat ageing, property retention depends on the property and grades considered. Impact strength and elongation at break are especially heat-sensitive characteristics. 

Temperatures for lifetimes of 20 000 h based on a 50% retention of elongation at break are, for example  

At low temperatures, the behaviour can be reasonably good down to -200°C, according to the grades and the mechanical constraints imposed. 

At -40°C, for two given PTFE and FEP grades, notched Izod impact strengths are, respectively, 107 J/m and 155 J/m. 

At -55°C, for another given PTFE grade, notched Izod impact strength is roughly 100 J/m. 

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Figure 4.88. PTFE examples of tensile stress and modulus retentions (%) versus temperature (°C)...

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