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PFA of pfa ball valve 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.
Respondido : 16/10/2013 2:00 pm
