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PTFE TEFLON
Bronze Teflon
Bronze Teflon
Bronze Teflon has the best wear properties, remarkable compression strengths and good thermal conductivity, but has poor electrical properties and chemical resistance. Bronze teflon is useful in applications subjected to high mechanical loads or subjected to high speed frictional contacts where bronze teflon provides strength and conductivity to remove excess, unwanted heat.
Usage Areas
Bearings, piston rings, valve sets, valve components
Mechanical Properties
| Specifications | Test ASTM | B40 | B60 |
|---|---|---|---|
| Tensile Strength (At Break) Kg/cm² | D638 | 150-280 | 140-220 |
| Elongation at break 23°C (%) | D638 | 120-280 | 110-220 |
| Compressive Strength (1% Deformation), 23°C (Kg/cm²) | D695 | 100-105 | 105-110 |
| Deformation Under Load (140 kg/cm, 24 hours, 23 °C)(%) | D621 | ||
| Total Deformation(%) | D621 | 3.8-4.9 | 3.7-4.8 |
| Permanent Deformation(%) | D621 | 1.4-2.1 | 1.5-2 |
| Total Deformation Under Load(%) | |||
| 10 kg/cm² load, 150 °C, 24 hours(%) | 1.1-1.2 | 1-1.1 | |
| 50 kg/cm² load, 150 °C, 24 hours(%) | 10-11 | 9-10 | |
| Impact Strength (Izod, notched)(Kj/m²) | D256 | 11-12 | 10-11 |
| Hardness (Shore D) | D2240 | 64-68 | 65-70 |
Physical Properties
| Specifications | B40 | B60 |
|---|---|---|
| Specific Gravity 23°C (gr/cm³) | 3.05-3.15 | 3.8-4.0 |
| Coefficient of Friction, Static | 0.06 | 0.07 |
| Coefficient of Friction, Dynamic | 0.12 | 0.13 |
| PV Limits | ||
| 3 m/min (Kg.cm/cm².min) | 250-270 | 300-320 |
| 30 m/min (Kg.cm/cm².min) | 350-380 | 390-400 |
| 300 m/min (Kg.cm/cm².min) | 400-500 | 450-550 |
Thermal Properties
| Specifications | Test ASTM | B40 | B60 |
|---|---|---|---|
| Specific Heat (Kcal/kg.°C) | - | - | |
| Thermal Conductivity (x10^-4) 30°C (Cal/cm.sec.°C) | 17-20 | 17-20 | |
| Coefficient of Expansion (x10^-5) (°C^1) | D696 | ||
| 25°C-100 °C | D696 | 8-9.5 | 7.5-9 |
| 25°C-200 °C | D696 | 9.5-11 | 10-11.5 |
| 25°C-300 °C | D696 | 12.5-13.5 | 13-14 |
| Operating Temperature, Minimum (°C) | -260 | -260 | |
| Operating Temperature, Maximum (°C) | +270 | +270 |
Electrical Properties
| Specifications | Test ASTM | B40 | B60 |
|---|---|---|---|
| Dielectric Strength, 0.1 mm short time (Kv/mm) | D149 | - | - |
| Dielectric Constant, 50 Hz-10 Hz | D150 | - | - |
| Volumetric Resistance, 23°C (Ohm-cm) | D257 | > 10⁸ | > 10⁷ |
| Surface Resistance, 23°C 50% Relative Humidity (Ohm) | D257 | > 10¹⁰ | > 10⁹ |
| Dielectric Loss Factor, 50 Hz, 23 °C (dry environment) | D150 | - | - |
