PTFE Grades Guide: Virgin, Glass, Carbon & Bronze Filled PTFE
Technical Specification
| Grade | Filler | Best For |
|---|---|---|
| Virgin PTFE (100%) | None | General sealing, insulators, FDA/food-grade applications |
| Glass Filled PTFE (15%) | Glass Fiber | Piston rings, bearings, higher compressive strength |
| Graphite Filled PTFE (15%) | Graphite | Valve seats, lower friction, thermal conductivity |
| Glass + MoS2 Filled PTFE (15%+5%) | Glass & Molybdenum Disulfide | Dynamic seals, sliding components |
| Carbon Filled PTFE (25%) | Carbon | Pump housings, dimensional stability |
| Bronze Filled PTFE (40%) | Bronze Powder | Bushings, bearings, gears, high wear resistance |
How To Choose The Right PTFE Grade
Not all PTFE is the same — adding fillers changes its wear resistance, compressive strength, and thermal behavior for demanding applications. Key considerations:
- Virgin PTFE: Best where chemical purity and FDA compliance matter most, such as food and pharmaceutical sealing.
- Glass Filled PTFE: Adds compressive strength and wear resistance for piston rings and bearings under load.
- Graphite Filled PTFE: Improves thermal conductivity and lowers friction, suited to valve seats and high-speed sliding parts.
- Carbon Filled PTFE: Improves dimensional stability and electrical conductivity for pump housings and precision components.
- Bronze Filled PTFE: Offers the highest wear resistance and thermal dissipation of the common filled grades, suited to bushings, bearings, and gears under continuous load.
Our technical team can help match the right PTFE grade to your load, temperature, and chemical exposure requirements — see our full PTFE Products range for complete technical specifications and standard sheet, rod, and tube sizes.
Common Applications By PTFE Grade
- Virgin PTFE – Gaskets, insulators, chemical linings, food-grade seals
- Glass Filled PTFE – Piston rings, thrust washers, bearings
- Graphite Filled PTFE – Valve seats, high-speed dynamic seals
- Glass + MoS2 Filled PTFE – Dynamic seals, sliding and mechanical components
- Carbon Filled PTFE – Pump housings, precision machined components
- Bronze Filled PTFE – Bushings, bearings, gears, wear rings
All grades are available as sheets, rods, and tubes, custom cut and CNC machined to your specifications. See our PTFE Products page for full technical properties and standard sizes, or our Engineering Plastics Product range for other polymer grades.
Q1. What PTFE Grades Does Diode Trading EST Stock?
A. We stock Virgin PTFE and filled grades including 15% Glass Filled, 15% Graphite Filled, 15% Glass + 5% MoS2 Filled, 25% Carbon Filled, and 40% Bronze Filled PTFE, in sheets, rods, and tubes.
Q2. Which PTFE Grade Is Best For Bearings And Bushings?
A. Bronze Filled PTFE and Glass Filled PTFE are commonly used for bearings and bushings thanks to their improved wear resistance and compressive strength compared to virgin PTFE.
Q3. Is Virgin PTFE Food-Safe?
A. Yes, unfilled Virgin PTFE is FDA-compliant and commonly used for food and pharmaceutical sealing applications.
Q4. Can You Machine Filled PTFE Grades To Custom Sizes?
A. Yes, we offer CNC turning, milling, and cutting for all PTFE grades to your exact drawings and dimensions.
Q5. Do You Deliver PTFE Grades Across Saudi Arabia And The GCC?
A. Yes, Diode Trading EST supplies all PTFE grades with fast delivery across Saudi Arabia and the wider GCC.
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