Basic characteristics of pure PTFE

MECHANICAL PROPERTIES:

• Volume mass: 2.15–2.17g/cm³
• Tensile strength: 28–32N/m²
• Expansion at fracture 300–500%
• Flexibility number 106
• Hardness D-Shor 55–59Sh, at 150°C 37Sh
• Friction coefficient: PTFE/PTFE – dry
  - Static 0.09
  - Dynamic 0.09
  - PTFE/PTFE – oil 0.04–0.07
  - PTFE/STEEL – oil 0.02–0.06

PHYSICAL PROPERTIES:

• Moisture (water) absorption 0%
• Linear thermal expansion:
  - 20–100°C 16×10-5K-1
  - 20–200°C 19.5×10-5 K-1
  - 20–300°C 25×10-5K-1
• Melting point temperature 327°C

ELECTRICAL PROPERTIES:

• relative dielectric constant 50–108Hz 2.1
• dielectric loss factor 50–108Hz 0.3–0.7×10-4
• penetrative hardness 20–80KV/mm
• specific resistance 1018Ω per cm
• surface resistance 1017Ω per cm
• resistance to creeping currents KA 3 C

CHEMICAL RESISTANCE:

Almost completely chemically resistant to acids, lyes, solvents and thinners with the exception of melting alkali metals (sodium, potassium), fluorine compounds, or if subjected to high pressure or high temperature.

The benefits of pure PTFE compared to other plastics are combined in the following points:

• thermal stability from -200°C to +260°C, for a short-term even up to 315°C
• good chemical and atmospheric resistance
• very good sliding characteristics, low coefficient of friction
• nothing sticks to it
• good electrical insulation characteristics depending on the external conditions