Technical Data Sheet
PTFE Teflon Gasket
Specialized Items
Polytetra Processors
Rakhial, Ahmedabad, Gujarat, India
www.automatasia.com
Gaskets and seals delivering excellent purity, low seating stress and reduced creep or cold flow, produced in all standard ANSI flange sizes plus welded one-piece construction.
Specification
| Sizes | ANSI B16.21 and DIN flange sizes; Class 150/300; custom thicknesses and profiles |
|---|---|
| Tolerances | Cut profile and thickness to approved drawing; CNC work available to ±0.05 mm where applicable |
| Grades | Virgin PTFE, 15% Glass-filled PTFE, 25% Glass-filled PTFE, 25% Carbon-filled PTFE, Bronze-filled PTFE |
| Standards | ASTM D4894, ASTM D4745 |
| Typical uses | Flange sealing, Damaged or rough face sealing, One-piece welded seals |
| Industries | Chemical, Pharmaceutical, Food processing |
Typical properties — virgin PTFE
| Property | Typical value | Test method |
|---|---|---|
| Specific gravity | 2.14 – 2.20 | ASTM D792 |
| Tensile strength | 20 – 35 MPa | ASTM D638 / D4894 |
| Elongation at break | 200 – 400 % | ASTM D638 / D4894 |
| Hardness | Shore D 50 – 65 | ASTM D2240 |
| Coefficient of friction (dynamic) | 0.04 – 0.10 | ASTM D1894 |
| Continuous service temperature | −200 °C to +260 °C | — |
| Melting point | ≈ 327 °C | ASTM D4894 |
| Dielectric strength | ≈ 32 kV/mm (short time, thin section) | ASTM D149 |
| Water absorption | < 0.01 % | ASTM D570 |
Typical values for guidance only, not guaranteed minimums. Filled grades, linings and finished parts differ; confirm limits for your application. Issued 2026.