Technical Data Sheet
Carbon Filled Teflon Bush with S.S. Key
Paper Industry
Polytetra Processors
Rakhial, Ahmedabad, Gujarat, India
www.automatasia.com
Supplied as a set of bush and rings made to customer specification, with a special stainless steel key fitted for better wear resistance and smoother machine running.
Specification
| Sizes | Bush-and-ring sets made to customer specification |
|---|---|
| Tolerances | Keyway, bore and outside diameter to approved drawing |
| Grades | 25% Carbon-filled PTFE, Graphite-filled PTFE, Virgin PTFE on request |
| Standards | ASTM D4894, ASTM D4745 |
| Typical uses | Keyed rotary assemblies, Replacement sets |
| Industries | Paper mills |
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.