DESCRIPTION
PTFE o-rings are designed for a wide variety of sealing applications.  PTFE has excellent heat, fuel and chemical resistance and is acceptable for temperature applications between -328F to 500F.  PTFE is vulnerable to high vacuum seals, low compression vacuum sealing flanges, and super-heated steam. 
PTFE does not have the "memory" of elastomeric compounds, so it's poor resilience make it a bad choice for most o-ring applications.  Please consult the H&D technical group for assistance. 
While there are many PTFE blends and filler systems available, our standard PTFE o-rings are made from Unfilled PTFE. 
 
SEAL INFORMATION
Durometer (Shore D): 55  
Temperature Range (F): -328 TO 500  
Part Number Definition (Inch): (AS568 3-DIGIT NUMBER)TFE  
Additional Part Number Definition (Inch): 4"ID X .210"CS   =   345TFE