Filled PTFE Compounds — Glass, Carbon, Graphite & Bronze
PTFE compounded with glass, carbon, graphite, bronze or MoS₂ fillers — dramatically higher wear resistance, lower creep and better load capacity than virgin PTFE, supplied as powder and molded stock for seals, bearings and dynamic parts.
What Is Filled PTFE
Filled PTFE — also called PTFE compounds — is virgin polytetrafluoroethylene (PTFE, CAS 9002-84-0) blended with inorganic or metallic fillers such as glass fiber, carbon, graphite, bronze or molybdenum disulfide (MoS₂). Fillers keep PTFE’s chemical resistance and low friction while sharply improving wear resistance, compressive strength and dimensional stability.
The main weakness of virgin PTFE is creep (cold flow) and soft wear behaviour under load. Fillers address exactly this — see general PTFE property data — so filled PTFE is the standard choice for seals, bearings, piston rings and valve seats.
Filled PTFE Grades Compared
Five filler systems, each tuned to a property you need — pick by wear, friction, load or conductivity. Click a grade to see its dedicated page.
| Filled PTFE Grade | Typical Loading | Key Benefit | Best For |
|---|---|---|---|
| Glass-Filled PTFE | 15–25% | Higher wear resistance, low creep, dimensional stability, chemical resistance kept | General seals, bearings, back-up rings |
| Carbon-Filled PTFE | 25% | Wear and compressive strength, thermal conductivity, some electrical conductivity | Dynamic seals, piston rings, bushings |
| Graphite-Filled PTFE | 15% | Lowest friction, self-lubrication, good in water and non-lubricated service | Non-lubricated bearings, rotary seals |
| Bronze-Filled PTFE | 40–60% | Maximum wear resistance, high load and thermal conductivity | High-load bearings, seal rings, guides |
| MoS₂-Filled PTFE | 5% | Low friction with higher hardness and lower initial wear | Low-friction dynamic parts |
Filled PTFE Applications
Filled PTFE is the standard choice wherever virgin PTFE would creep or wear too fast — seals, bearings, piston rings, valve seats and machined wear parts.
Seals
Key sealing element in pumps, compressors and mechanical seals — filled PTFE resists creep under load.
Bearings
Low-friction, wear-resistant bearing material for automotive and industrial components.
Gaskets
Sealing of reactors, pipes and valves where chemical resistance and stable clamp load matter.
Filled PTFE Rod
Extruded and molded rod for machining seals, bushings and wear parts.
Filled PTFE Sheet
Skived and molded sheet for gaskets, slide plates and lining.
Chemical Processing Equipment
Lining and sealing of chemical reactors and valves in aggressive media.
Filled PTFE — Frequently Asked Questions
Why use filled PTFE instead of virgin PTFE?
Virgin PTFE has excellent chemical resistance and low friction but creeps (cold-flows) and wears quickly under load. Fillers such as glass, carbon, graphite and bronze cut creep, raise wear resistance and compressive strength, and can add thermal or electrical conductivity — while keeping most of PTFE’s chemical resistance.
Which filler should I choose?
Glass for general wear and creep resistance; carbon for wear plus compressive strength and some conductivity; graphite for the lowest friction and self-lubrication; bronze for maximum wear resistance and load; MoS₂ for low friction with higher hardness. Send us your load, speed and medium and we will recommend a compound.
Does filling reduce PTFE’s chemical resistance?
Inert fillers like glass and graphite keep most of PTFE’s chemical resistance; metallic fillers such as bronze are attacked by strong acids and alkalis, so grade selection must consider the service medium.
How is filled PTFE supplied?
As free-flowing compounded powder for compression molding and ram extrusion, or as finished stock shapes — rod, tube, sheet and molded billets — ready to machine into seals, bearings and wear parts.
What filler loadings are typical?
Loadings range from about 5% (MoS₂) to 60% (bronze) by weight depending on the filler and target property. Higher loadings raise wear resistance and stiffness but lower elongation — we tune the ratio to your part.
Is Peflon filled PTFE PFOA-free and compliant?
Yes — Peflon filled PTFE compounds are PFOA-free, pass REACH testing and comply with EU regulations, with per-batch documentation available on request.
Related to Filled PTFE
Modified PTFE
Modified PTFE powder — glass, carbon, graphite, bronze and MoS₂ filled grades.
PTFE Molding Powder
Virgin granular PTFE for compression molding of rod, tube, sheet and seals.
PTFE Fine Powder
Paste-extrusion PTFE for tube, wire & cable, seal tape and sleeving.
PTFE Teflon Rod
PTFE and filled-PTFE rod for machining seals, bushings and wear parts.
Technical Support of Filled PTFE
Selecting and machining filled PTFE raises real engineering questions — filler choice, loading, wear and creep behaviour and stock-shape selection. Our technical library shares practical, hands-on guidance from the Peflon materials team.
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Get a Filled PTFE Compound or Stock Shape
Tell us your filler, loading target, part form and service conditions — our engineers will match a filled PTFE compound or stock shape, send the TDS and reply within 24 hours.