FEP / FPA Encapsulated (TEFLEX)
There are certain applications which prohibit the use of conventional elastomeric O-Ring seals. The use of hostile chemicals or extreme temperatures (both high and low) during various processes can make effective sealing very difficult.
This is where ERIKS FEP/FPA Teflex o-rings offer a high performance solution.
A Teflex O-Ring comprises an elastomeric energising core, which has a seamless jacket made from a fluoropolymer. The elastomeric core may be Viton® or Silicone. The jacket is made from Teflon® FEP or PFA as detailed below.
FEP Jacket on solid Viton® core
This the most popular combination and indeed the most technically
capable in providing a compression seal.
The Viton® core compound has been specifically formulated to give very low compression set results and this characteristic speeds up the somewhat slow memory of the Fep jacket.
The temperature range is -20°C to +204°C / -20°F to +392°F.
FEP Jacket on solid Silicone core
This combination again is very popular and this is due to lower
cost against that of the Viton® core.
Technically it is inferior to Viton® except when used for low temperature application.
The temperature range is -60°C to +204°C / -76°F to +392°F.
PFA Jacket on solid Viton® core
PFA offers higher abrasion resistance to that of FEP.
The temperature range is -20°C to +204°C / -4°F to +392°F.
PFA Jacket on solid Silicone core
This combination is preferred for higher temperature applications.
The PFA jacket shares the same temperature service limits as the Silicone core.
The temperature range is -60°C to +260°C / -76°F to +500°F.