Teflon PTFE/FEP vs. Vespel Machining
Comparison of Teflon PTFE/FEP and Vespel Property Values
| Unfilled | 35% Glass Filled | 24% Carbon Filled |
|---|
| < 0.01 | 0.02 | 0.05 |
| 3,900 | 2,100 | 1,900 |
| 72,000 | 190,000 | 160,000 |
| 7.5 | 6.4 | 6.0 |
| -- | -- | -- |
| Material |
|---|
| Water Absorption Rating |
| Tensile Strength |
| Flexural Modulus |
| Coefficient of Linear Thermal Expansion |
| Dielectric Strength |
| Unfilled |
15% Graphite |
40% Graphite |
10% PTFE,
15% Graphite |
15% Moly |
| 0.24* |
0.19* |
0.14* |
0.21* |
0.23* |
| 12,500* |
9,500* |
7,500* |
6,500* |
8,200* |
| -- |
-- |
-- |
-- |
-- |
| 3.0 |
2.7 |
2.1 |
3.0 |
2.9 |
| 560 |
250 |
-- |
-- |
-- |
Material Properties
- Excellent dielectric properties
- Inertness to most chemicals
- High heat and chemical resistance
- Very low coeffiecient of friction
- Excellent radiation resistance
- Zero moisture absorption
- Relatively insensitive to power frequency
- Machinability
- Continuous performance at up to 600°F
- No special machining equipment required
- Dimensionally stable
- Operates at very high PVs
- Does not become brittle even at subzero temperatures
- Machinability
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