haoyunz5156
2009- 9- 6, 04:32 AM
PFA lined valve (http://www.corrosion-resistant-valves.com/corrosion-resistant-pipe-fitting.html) of PFA is very similar in composition to the fluoropolymers PTFE and FEP (fluorinated ethylene-propylene). PFA and FEP both share PTFE's useful properties of low coefficient of friction and non-reactivity, but are more easily formable. FEP is softer than PTFE and melts at 260 °C; it is highly transparent and resistant to sunlight.