PTFE gasket is made by cutting PTFE stick, pipe and sheet into flat shape, V shape gasket or valve annulus. It has 100% PTFE structure. It can bear the most bitter chemical medium, and has good anti-creeping.
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The DH-G-PF Pure PTFE Gasket is a high-purity sealing component crafted from 99.95% virgin PTFE resin via isostatic pressing and precision machining. Designed for critical chemical and food applications, it meets FDA 21 CFR 177.1550, USP Class VI, and ISO 22262-1 standards. Standard sizes range from 25×25mm to 3000×3000mm (thickness 0.2mm-12mm); custom shapes (including complex cutouts) are available with CNC machining (± 0.1mm tolerance).
Chemical Inertness: Resists all chemicals except molten alkali metals and elemental fluorine; no extractables in food-grade applications.
Temperature Performance: Continuous -260℃ to +260℃, intermittent 280℃; stable after 1000 thermal cycles (-196℃ to 260℃).
Mechanical Properties: Compression rebound ≥ 40%, creep relaxation ≤ 10% (1000h, 5MPa); tensile strength 28MPa.
Sealing Efficiency: Helium leak rate ≤ 1×10⁻⁸ Pa·m³/s (ISO 12747-2); no volume swell in 150℃ ethanol (ASTM D471-16).
Surface Finish: Ra 0.2-0.4μm for optimal flange contact; anti-stick surface reduces installation force by 30%.
Semiconductor: Wafer cleaning equipment seals (HF-compatible), CMP slurry tank flanges.
Food & Pharma: Sterile reactor manholes, beverage bottling line valves (no taste/odor transfer).
Chemical Processing: Acid storage tank flanges (98% HNO₃), solvent transfer pipe joints.
Cryogenics: Liquid helium dewars, LN₂ storage tank seals (-196℃).
Cold flow (plastic deformation) is minimized by:
Using glass microfiber-reinforced variants (10% glass content) for pressures > 10MPa.
Limiting compression to 15-20% of thickness (vs. 25% for non-reinforced PTFE).
Installing with metal retainer rings for flanges > 1000mm diameter.
Optimal flange roughness: Ra 0.4-0.8μm (ISO 3601-3:2022). Rougher surfaces (>Ra 1.0μm) cause leakage; smoother surfaces (<Ra 0.2μm) reduce friction, leading to gasket creep. Polish flanges with 400-grit sandpaper for best results.
Shelf life is 5 years when stored at 10-25℃, RH < 60%, away from UV radiation and ozone sources. Avoid stacking > 50mm thickness to prevent permanent deformation; store flat on wooden pallets.
Item | Unit | Value |
Density | g/cm³ | 2.10-2.40 |
≥Tensity strength | Mpa | 15.0 |
≥elongation at break | % | 150 |
≥ Electrolyze | Kv/mm | 10 |
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