ptfe resin

PTFE Resins Commonly Used in Seals

In this article, we’ll look at the fillers employed in PTFE resins.

In its virgin form, PTFE resin isn’t the best sealing material for dynamic shaft applications. Therefore, different fillers are added to achieve the desired results. The most common fillers are fiberglass, graphite, carbon, coke flour and molybdenum, although any filler can be added to virgin PTFE resin as long as the material can withstand maximum sintering temperature of 710-730 degrees F.

In order to develop lip seal products properly from PTFE resins, it is vital that the engineer understands the favorable and unfavorable characteristics of the resin.

Several characteristics and properties of PTFE resin must be considered to realize a reliable product. They are:

• High wear rate of the PTFE resin and/or mating surface when improper fillers are used for a specific set of operations.
• PTFE resins have a high thermal expansion rate and compressive