In general, it is safer to assume that fabrication procedures affect some properties of PTFE and FEP products. Certain physical properties such as tensile strength, permeability and dielectric strength vary with fabrication conditions. Examples of causes of these may be macroscopic flaws, microporosity (for PTFE properties) and crystallinity. The extent of the variation depends upon the specific conditions of fabrication. Properties of PTFE and FEP that are relatively unaffected are as follows:
- Chemical resistance.
- Long-term weathering.
- Non-stick.
- Non-flammability
- Low dielectric constant and low dissipation factor.
- High arc resistance, surface and volume resistivities.
- Flexibility at low temperatures and thermal stability at high temperatures.
- Low coefficient of friction.
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