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3.  TEMPERATURE: Similar to the pressure level, you need to know what temperature your machinery can operate at. You need to choose a seal that can withstand the heat or cold. PTFE have the widest rang of temperature, making them a safe option when you are uncertain of the range.

Figure 14.3. Oil aging of fluoroelastomers.⁵ Chart shows percent retained elongation. Conditions: Aged at 150°C in Service Fluid 105 (oil changed every 168 h).