Glass Fiber Filled PTFE
2025年10月22日Filled PTFE Powder & Flowable Pelletized PTFE
for Industrial Molding
Industrial processors require consistent, flowable PTFE compounds. Two standard feedstocks dominate: filled PTFE powder and flowable pelletized (pre-sintered granular) PTFE. Both enable high-efficiency, high-density finished parts.
This guide details their properties, compatible processes (isostatic molding, automatic molding, ram extrusion, screw extrusion), and typical applications (seals, valve liners, insulation, lubricant additives).
Complete Filler Systems for Tailored Performance
Both powder and pelletized forms utilize a complete filler system. Common fillers include glass fiber, carbon, graphite, bronze, or MoS₂. The filler modifies:
- Wear resistance and friction coefficient
- Thermal and electrical conductivity
- Compression strength and creep resistance
The base resin is pre-sintered – a critical step that improves batch-to-batch consistency and reduces void formation during final molding.
Compatible Molding Processes
| Process | Recommended Form | Key Feature |
|---|---|---|
| Isostatic Molding (Wet Bag / Dry Bag) | Filled PTFE powder | Large-diameter billets, uniform density |
| Automatic Compression Molding | Flowable pelletized / Powder | Fast cycle times, consistent die filling |
| Ram Extrusion | Flowable pelletized PTFE | Continuous rods, tubes, high output |
| Screw Extrusion | Flowable pelletized compounds | Small-diameter profiles, wire coating |
Processing Advantages
- High efficiency – Flowable pellets reduce pre-form time. Automatic molding achieves cycle times under 60 seconds for small parts.
- High finished part density – Pre-sintered material minimizes voids. Typical density >2.15 g/cm³ for unfilled grades.
- No injection molding – PTFE’s extremely high melt viscosity (10¹⁰–10¹¹ Pa·s) prevents conventional injection molding. These powders and pellets are strictly for compression, isostatic, or extrusion processes.
Typical Applications
| Application | Recommended Form | Key Benefit |
|---|---|---|
| Sealing gaskets | Flowable pelletized | High density, leak-tight performance |
| Valve liners | Filled PTFE powder (isostatic) | Uniform filler distribution, corrosion resistance |
| Electrical insulation parts | Flowable pelletized (automatic molding) | Consistent dielectric strength |
| Lubricant additives | Filled PTFE powder (fine grind) | Low friction, temperature stability |
Complete Filler System Portfolio
Our complete filler system covers all common industrial requirements:
Custom filler blends (e.g., glass + graphite) available upon request.
Technical Support & Documentation
For isostatic large-diameter billets or complex hollow shapes.
For ram extrusion, screw extrusion, or high-speed automatic molding.
Selecting the right form – powder vs. flowable pelletized – depends on your molding press and part geometry. For tailored recommendations, access our technical library:
- 📄 Technical Data Sheets – Particle size distribution, bulk density, filler percentage
- 🧪 Free Sample Program – Test 1–2 kg of your selected grade
- 🔧 Process Support – Molding parameters, sintering profile recommendations
👉 Contact our engineering team to request data sheets, samples, or application-specific formulation.
Filled PTFE (Polytetrafluoroethylene) is a modified version of pure PTFE, enhanced with various fillers to improve its mechanical and thermal properties. Common fillers include glass fibers, carbon, graphite, bronze, or ceramics, which increase wear resistance, reduce creep, and enhance load-bearing capacity while retaining PTFE’s inherent chemical inertness and low friction.
Key Features:
- Enhanced Durability: Better wear resistance and reduced deformation under load.
- Low Friction: Maintains excellent non-stick and self-lubricating properties.
- Chemical Resistance: Resists most corrosive chemicals and solvents.
- Wide Temperature Range: Performs well from -200°C to +260°C.
Applications:
Used in seals, bearings, gaskets, and sliding components across industries like automotive, aerospace, and chemical processing.
Filled PTFE combines the best of PTFE with added strength for demanding environments.