PTFE (Polytetrafluoroethylene) has become a commonly used material in sealing applications where other materials do not meet temperature, chemical compatibility, friction, or wear requirements. Many customers are unaware that “fillers” may be added to PTFE in order to enhance certain characteristics not found in virgin PTFE. Virgin PTFE possesses behavior that reduces effectiveness in mechanical applications.
Significant deformation of virgin PTFE may occur over time even at room temperatures. We recently had a customer that indicated that the ID (Inside Dimension) of their virgin PTFE seals was significantly less than the requirement. This seals had been in inventory for 6+ months and deformed over time without anything used to retain the original dimension/shape. Virgin PTFE also wears quickly. The use of fillers improves the physical attributes of virgin PTFE, including creep and wear resistance. Which filler to use certainly depends on the application. Some of the common fillers we have used to meet customer requirements include:
Founded in 1994, Colonial Seal Co. is headquartered in Westville, New Jersey. Colonial Seal specializes in oil & grease seals, hydraulic seals, rotary shaft seals, mechanical seals, rubber molded products and gaskets. Through a global network of manufacturers, Colonial Seal can produce custom seals designed for a client’s unique sealing applications. Colonial Seal Company is ISO 9001:2015 certified.