PTFE-Impregnated Textiles
Glass fiber and aramid fabrics impregnated with PTFE dispersion become high-performance industrial materials: non-stick conveyor belts for food processing, chemical-resistant filter bags, and high-temperature gasket/packing materials.
Application Matrix
| Substrate | PTFE Loading | Sintering Temp | End Use |
|---|---|---|---|
| Glass fiber cloth | 40–70% | 380–400°C | Food conveyor belts, release sheets |
| Aramid (Kevlar) fabric | 20–40% | 350–380°C | High-temp gaskets, packing |
| Polyester filter felt | 10–25% | 200°C (below melt) | PTFE-treated filter bags |
| Carbon fiber | 5–15% | 350°C | Specialty release, low friction |
Process Steps
- Dipping — fabric passes through PTFE dispersion bath (60% solids, diluted to 30–50%)
- Metering — squeeze rollers control pickup (wet-on-wet weight)
- Drying — IR or hot air at 100–150°C to remove water
- Sintering — 380–420°C to coalesce PTFE particles into continuous film
- Multiple passes — repeat 3–8 times to build target loading
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