Kaxite expanded PTFE (ePTFE) gaskets are made by stretching virgin PTFE into a soft, porous, fibrillated structure. The result is a gasket that compresses into pitted, warped or imperfect flange faces — sealing joints that solid PTFE, spiral-wound or metal gaskets simply cannot seal, without requiring high bolt load.
Expanded PTFE has a density of only 0.6–0.9 g/cm³ (solid PTFE is 2.1–2.3), which means it compresses 40–60% under normal bolt load and fills irregular surface profiles.
The fibrillated internal structure resists creep and cold flow in every direction — a common failure mode of solid PTFE on thermally cycled joints.
Recovery ≥25% means the gasket springs back after compression, maintaining a tight seal through pressure fluctuations and temperature cycling.
Seals at much lower bolt load than solid PTFE or spiral-wound gaskets, making it the default choice for glass-lined, enamel, plastic and FRP equipment.
Chemically inert across pH 0–14 — resists acids, bases, oxidizers and nearly all industrial solvents, the same as solid PTFE. Non-stick, non-aging, non-leaching.
Continuous service from −268°C to +260°C, with short-term peaks to +315°C. One of the widest temperature ranges of any soft gasket material.
Seals without cracking the fragile glass lining — the low bolt-load requirement is essential for this equipment category.
Acid, halogen, solvent and oxidizer flanges where the gasket must resist the full pH 0–14 range.
FDA 21 CFR 177.1550 compliant for CIP/SIP circuits, sterile process equipment and food-contact lines.
Soft compression avoids distorting or cracking plastic flange faces that cannot take high bolt torque.
Handles thermal cycling between service and shutdown without relaxing bolt load, reducing re-torque maintenance.
Best choice when replacing asbestos or legacy gaskets on flanges that no longer meet original dimensional tolerance.
| Property | Value | Notes |
|---|---|---|
| Material | Expanded PTFE (ePTFE) | 100% virgin, no fillers |
| Density | 0.6 – 0.9 g/cm³ | Fibrillated porous structure |
| Service temperature | -268 ~ +260°C | Peak short-term +315°C |
| Max pressure | 200 bar / 20 MPa | Depends on size and temperature |
| Compressibility | 40 – 60% | ASTM F36 |
| Recovery | ≥ 25% | ASTM F36 |
| Chemical resistance | pH 0 – 14 | Universal industrial chemicals |
| Thickness range | 1 – 10 mm | Custom thickness on request |
| Supply forms | Sheet / Ring / Tape | Die-cut or adhesive-backed |
| Flange standards | ASME / EN / DIN / JIS / GB | Custom drawings supported |
| Certifications | FDA / RoHS / REACH | 21 CFR 177.1550 |
| Step | Information you provide | Our response |
|---|---|---|
| 1 | Flange standard and nominal size | Matched gasket drawing |
| 2 | Sheet / ring / tape form, OD × ID × thickness | Cutting feasibility confirmed |
| 3 | Operating temperature, pressure, media | Thickness recommendation |
| 4 | Quantity and target delivery date | Unit price and lead time |
| 5 | Documentation requirements | Material cert / SGS / third-party |
| 6 | Sample request | Free sample for qualified buyers |
Send flange standard, size, thickness and operating conditions — our engineers reply with pricing, lead time and sample availability within 24 hours.
Related products: Pure PTFE Gaskets PTFE Envelope Gaskets Modified PTFE Gaskets PTFE Ring Gaskets Expanded PTFE Sheet
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