PTFE, RPTFE, PTFE/PFA Copolymer

[rydia]

Hello,
I've got some ball valve specifications where NXT Modified PTFE is being specified for the seat material. Has anyone had any experience with this type of material?
How does it compare against 15% Glass Reinforced PTFE in terms of performance, services, chemical resistance and permeation? Is it considered a PTFE/PFA polymer?
Any experiences that you have would be great.

Rydia

 

[joeswoes]

NXT is a replication of the old TFM polymer from Dyneon. It is a modified PTFE which contains a small percentage of the monomer used in the manufacturing of PFA. It is not, contrary to conventional wisdom, a "PTFE/PFA blend. The material possesses all the attributes of PTFE with the following :

weldability
stability at high temperatures

The second property is why it would be specified for ball valve seats. It would behave similar to glass-reinforced PTFE, without the glass which can scratch the ball.

 

[NGiLuzzu]

rydia,
please take also a look at thread408-163021 within this Forum: sometimes fluorinated polymers' world is such... an "undiscovered country" ;-)

Bye, 'NGL

 

[rydia]

Thanks for your input, it is greatly appreciated!