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Read moreSpecialty PTFE Filler Grades: Mica, MoS2, Aluminium Oxide, Steel
01 October, 2026 | Admin
Beyond the common glass, carbon and bronze-filled PTFE grades, several more specialised filler combinations exist for specific mechanical and environmental demands. These specialty PTFE filler grades are refinements for unusual duty, not a default starting point. This guide covers four worth knowing about: mica, molybdenum disulfide (MoS2), aluminium oxide and stainless steel-filled PTFE.
Specialty Filler Comparison
| Filler Type | Key Property Improvement | Typical Application |
|---|---|---|
| Mica-filled | Improved dimensional stability, reduced cold flow | Precision components needing tight tolerance retention |
| Bronze + Molybdenum Disulfide | High compressive strength plus enhanced lubricity | Heavy-load, high-cycle dynamic components |
| Glass + MoS2 combination | Balanced wear resistance and low friction | Dynamic seals under moderate load |
| Aluminium Oxide-filled | High hardness, abrasion resistance | Abrasive-service wear components |
| Stainless Steel-filled | High thermal conductivity, wear resistance | Applications needing heat dissipation through the component |
Properties and values described here are typical and are confirmed on quotation for your project.
Why These Combination Grades Exist
Single-filler grades such as pure glass-filled or pure carbon-filled PTFE each improve one property at the cost of others. Combination fillers, like bronze plus molybdenum disulfide or glass plus MoS2, are formulated to balance two properties simultaneously, such as high compressive strength alongside good lubricity, which a single filler often cannot deliver together.
The Standard Grades First
Before moving to a specialty grade, review the standard options: glass-filled PTFE, carbon-filled PTFE and bronze-filled PTFE. Our PTFE grades guide compares them against virgin PTFE.
When to Consider a Specialty Grade
These grades are generally worth considering when a standard glass, carbon or bronze-filled PTFE has not delivered the service life or performance expected in your specific application. They suit demanding or unusual duty cycles such as heavy-load dynamic parts, abrasive service, or components that must carry heat away.
Points to Check Before Specifying
- The failure mode of the current grade: wear, creep, heat build-up or abrasion.
- Chemical compatibility of the filler with the process fluid.
- Load, speed and temperature of the application.
- Availability of the grade in the required rod, sheet or machined form, confirmed on quotation.
For the wider range, see PTFE products.
Frequently Asked Questions
Are specialty PTFE filler grades more expensive than standard glass or carbon-filled PTFE?
Generally yes, given their more specialised formulation and typically lower production volume. They are usually specified when a standard filled grade has not met the application's specific performance requirement, not as a general-purpose default.
What does molybdenum disulfide add to PTFE?
Molybdenum disulfide filled PTFE gains enhanced lubricity, and in combination with bronze or glass it balances load capacity with low friction.
What is mica filled PTFE used for?
Mica improves dimensional stability and reduces cold flow, so it suits precision components that must retain tight tolerances.
Request a Quotation
Tell our Al Khobar team about your application, load, temperature and quantities, and send drawings if available, and we will advise whether a specialty PTFE grade is worth specifying and quote supply.
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