How to choose fluorine lined valves with different temperature resistance?

Fluorine lined valves are most commonly used in the industrial field, and there are multiple material choices based on different degrees of temperature resistance, taking into account the specific usage environment.
Next, the temperature resistance and application of fluorine lined valves made of various materials will be introduced.
1. PTFE (polytetrafluoroethylene)
Temperature resistance range: -200 ℃ to+180 ℃
Applicable working conditions: Long term ≤ 150 ℃, short-term (<2h) can withstand 180 ℃
2. PFA (soluble polytetrafluoroethylene)
Temperature resistance range: -196 ℃ to+260 ℃
Applicable working conditions: Long term ≤ 150 ℃, short-term (emergency working conditions) up to 200 ℃
3. F46 (perfluoroethylene propylene)
Temperature resistance range: -85 ℃ to+150 ℃
Applicable working conditions: Long term ≤ 120 ℃, short-term ≤ 150 ℃