Filled PTFE

Get to Know Everflon+ PTFE Compound

In most situations, PTFE is an ideal choice for a wide range of applications.

There are occasions, however, when additional “fillers” such as graphite, carbon, glass, bronze, and other materials are added to enhance PTFE products for use in a specific application.

Generally speaking, these “Filled PTFE” maintain their original chemical and thermal resistance characteristics, while also exhibiting improved strength, stability, and/or durability.

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GLASS FILLER

	Adding glass to PTFE makes it stronger and more durable while reducing flexibility and the potential for creep. Glass-filled PTFE operates within the same temperature range as pure PTFE and is equally chemically inert. Everflon+ offers glass-filled PTFE with glass contents ranging from 5% to 60%. Increasing the glass filler content improves durability and compressive strength. Alternatively, glass-filled PTFE can be sintered under inert gas, further reducing the material's creep tendency and porosity. Glass-filled PTFE is more abrasive than pure PTFE, meaning it can wear away adjacent surfaces.

CARBON

Amorphous carbon is one of the most inert fillers used in PTFE, except in oxidizing environments where glass performs better. Carbon adds to the creep resistance, increases the hardness and raises the thermal conductivity of PTFE. Carbon filled compounds have excellent wear properties, in particular when combined with graphite. The combination of the above properties makes carbon/graphite compounds the preferred material for non-lubricated piston rings. The use of softer carbon has the additional advantage that it lowers tool wear during machining, thus allowing machining to very close tolerances. Carbon-containing compounds have some electrical conductivity and are therefore antistatic.

GRAPHITE

	Graphite is a crystalline modification of high purity carbon & commonly used filler in PTFE. Graphite-filled PTFE has one of lowest coefficients of friction. It has excellent wear properties, in particular against soft metals, displays high load-carrying capability in high-speed contact applications and is chemically inert. It is often used in combination with other fillers.

STAINLESS STEEL

PTFE gains enhanced strength and load-bearing capacity through the addition of stainless steel powder. Its excellent performance at high temperatures makes stainless steel-filled PTFE ideal for applications using steam and hot liquids. This type of PTFE is suitable for a variety of mechanical applications, as well as the food and beverage industry. It is extremely wear-resistant, which can even cause galling of adjacent surfaces, which should be considered.

BRONZE

	Bronze is an alloy of copper and tin. Addition of high percentages of bronze filler in PTFE results in a compound having high thermal conductivity and better creep resistance than most other compounds. Bronze-filled PTFE is often used for components in hydraulic systems, but is not suited for electrical applications and is attacked by certain chemicals. Bronze has a tendency to oxidize: bronze-filled compounds should therefore be used fresh and containers should always be kept closed. Some discoloration of the finished part during the sintering cycle is normal and has no impact on its qualit

POLYIMIDE

Polyimide refers to a class of synthetic polymers. Adding polyimide creates a PTFE compound with lower friction than all the previously described compounds. It's non-abrasive, making it a good choice for applications involving softer mating surfaces such as steel, aluminum, or other plastics. Therefore, polyimide-filled PTFE is particularly well-suited for dry-running and start-stop applications. However, polyimide is the most expensive of the PTFE fillers.

Explore the lineup.

Glass filled

Carbon / Coke filled

Graphite filled

Carbon + Graphite + Glass Filled

Bronze filled

Bronze plus, Molybdenum Disulphide filled

Aluminum Oxide filled

Calcium Fluoride filled

15~25%

25~35%

15%

12+3+10%

40~60%

55+5%

5~10%

High compressive strength

Excellent chemical resistance

Improved wear resistance under load & permanent deformation

High compressive strength

Improved wear resistance under load & permanent deformation

Better thermal / electrical conductivity.

High compressive strength

Improved wear resistance under load & permanent deformation

Better thermal / electrical conductivity.

Good chemical resistance

Improved frictional properties.

High compressive strength

Improved wear resistance under load & permanent deformation

Better thermal / electrical conductivity

High compressive strength

Excellent wear resistance improved under load & permanent deformation

Better thermal / electrical conductivity.

Good chemical resistance

Very low cold flow.

Improved fictional properties

High compressive strength

Excellent wear resistance improved under load & permanent deformation

Good thermal / electrical conductivity.

Very low cold flow.

Excellent electrical properties

Excellent compressive strength

Excellent wear resistance improved under load & permanent deformation

Excellent chemical resistance

Improved wear resistance under load & permanent deformation

Excellent compressive strength

Good with chemicals that attack glass

Stainless Steel filled

Mica filled

Glass + MoS₂ filled

MoS₂ Filled

Peek Filled

Borum Nitrite Filled

Cobalt Aluminate Filled

5~10%

15 + 5%

0.1~0.2%

15%

10%

0.3%

Excellent chemical resistance

Outstanding mechanical properties

Good wear resistance

Excellent compressive strength

Very low coefficient of thermal expansion

Poor tensile properties

High compressive strength

Excellent chemical resistance

Improved wear resistance under load & permanent deformation

Improved frictional properties

Self-lubrication in presence of apolar gas

Low friction coeff.

Retained high dielectric performance even in presence of improved thermal and electrical conductivity due to the filler

Good dimensional stability and not fragile like ceramic

Service temperature range from -272 up to +260°C

High compressive strength

Excellent chemical resistance

Outstanding mechanical properties at elevated temp.

Good wear resistance

Self-lubrication in presence of apolar gas

Low friction coeff.

Retained high dielectric performance even in presence of improved thermal and electrical conductivity due to the filler

Excellent compressive strength

Service temperature range from -272 up to +260°C

Self-lubrication in presence of apolar gas

Low friction coeff.

Retained high dielectric performance even in presence of improved thermal and electrical conductivity due to the filler

Very high compressive strength

Service temperature range from -272 up to +260°C

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Everflon™ PTFE Academic

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Everflon+ PTFE Compound

Get to Know Everflon+ PTFE Compound

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