PTFE Coating

PTFE is a acronym for Polytetrafluoroethylene which is a two-coat non-sticky fluropolymer coating. PTFE has the highest operating temperature among any fluoroplastic polymer. PTFE have extremely low co-efficient of friction, good chemical resistance and medium to fair abrasion resistance. PTFE is suitable as a dry lubricant with low co-efficient of friction.

Where is PTFE used?

PTFE is extensively used as a coating for Fasteners used in Oil & Gas, Marine & Offshore applications. PTFE coated fasteners stands exceptional to Salt Spray Test. It has outstanding release capabilities and can withstand a maximum use temperature of 600°F, higher than any fluoropolymer. This coating is typically applied to a thickness of 1-3 mils. Ptfe is also commonly referred by their tradename/brands, teflon, xylan, etc. These fluoro poly makes excellent choice for agressive environment. Ptfe or teflon coated fasteners are widely used in onshore and offshore engineering applications.

PTFE Coating Process

Object subjected to PTFE coating is heated to clean and remove excess foreign particles in form of dirt, oil and other stains, which can affect the adhesion of the coating. The substrate is then sand blasted to increase the adhesion of the coating. Then the primer layer is applied, in this case, we use zinc base coat of 20 microns followed by top coat of PTFE. PTFE coating is available in black, blue, green, red, white, yellow, orange, purple, etc.

Advantages of PTFE Coating

  • High temperature resistance
  • Low coefficient of friction
  • Corrosion resistance
  • Chemical resistance
  • Easy assembly & removal

PTFE Coated Products

PTFE Coating Specifications
Tensile Strength (ASTM D1708) 3000-5000 psi
Elongation (ASTM D1457) 300-500%
Impact Strength (ASTM D256) 3.5 ft-lb/in
Hardness (ASTM D2240) 50-65 HB (shore D)
Abrasion Resistance (Tabor) 12 mg
Coefficient of Friction (ASTM D1894) 0.12 -0.15 static, 0.05 -0.10 dynamic
Dielectric Strength (ASTM D149) 450 volts per mil
Use Temperature 600°F max
Melting Point 625°F
Thermal Conductivity 1.7 BTU-in/h-ft 2-°F
Chemical Resistance (ASTM D543) Excellent
Salt Spray Resistance (ASTM B117) Fair
Water Absorption (ASTM D570) 0.01%
Thickness 20 - 40 Microns