Choose the Best PTFE Packing for Your Application

Update:11 Sep 2017

Polytetrafluoroethylene (PTFE) is also known as Teflon, […]

Polytetrafluoroethylene (PTFE) is also known as Teflon, a non-stick material frequently used in cookware and protective clothing. There are a host of industrial uses for this versatile material, too. PTFE Rod is widely used in the aerospace, food and drink manufacturing, pharmaceuticals, and telecommunications sectors, to name but a few.

Pure PTFE is a low friction substance that can withstand huge changes in temperature, making it great for cookware such as non-stick pans. Physically, PTFE is highly flexible as well as extremely dense; therefore, a PTFE coating on machine parts makes them far more durable.

Carbon filled PTFE benefits from improved compressive strength, reduced deformation under heavy loads, and better wear resistance than virgin PTFE. Because carbon is conductive, it is suitable for applications which require higher thermal conductivity than PTFE alone and also becomes static dissipative due to its electrical conductivity. Carbon may be added in the form of powder or fibre. It can be abrasive, but not to the same extent as glass.

Polyimide refers to a class of synthetic polymers. Adding polyimide produces a PTFE compound that is lower in friction than all of those previously described. It is non-abrasive, making it a good choice for applications involving softer mating surfaces like steel, aluminium, or other plastics. Polyimide filled PTFE therefore suits dry running and stop-start applications particularly well. However, polyimide is the priciest of the PTFE fillers.

In summary, filled PTFE comes in many forms, each with unique benefits. Raw PTFE is already a versatile and extremely useful substance, and it can be further improved and tailored by the addition of various fillers. Several aspects should be considered when sourcing filled PTFE for a specific application. Does it require increased or reduced friction? What about thermal conductivity? Is compressive strength absolutely key? Different quantities and grades of filler can be added, and different fillers can even be combined to result in an even better solution.