PTFE Coating
PTFE coating applies a fluoropolymer layer, typically 15–40 µm, that gives a surface very low friction, non-stick properties and chemical resistance. It is used on moulds, food equipment, fasteners, valve parts and sliding components.
What it is
The part is degreased and grit blasted, then the fluoropolymer (PTFE, PFA, FEP or a bonded PTFE lubricant) is sprayed on and baked. True PTFE coatings cure at high temperature (around 380–400 °C), while bonded dry-film lubricants cure lower (around 200 °C) and suit heat-sensitive parts.
The result is a slippery, non-wetting surface with a coefficient of friction as low as about 0.05–0.2, good resistance to most chemicals, and service temperatures up to around 260 °C for PTFE.
Typical applications
- Moulds, heat-sealing jaws and packaging equipment
- Food-processing and bakery equipment
- Fluoropolymer-coated fasteners and bolts
- Valve parts, seats and pump components
- Sliding and anti-galling components
Suitable materials
- Carbon steel and stainless steel
- Aluminium
- Cast iron
- Brass and copper alloys
Points to consider
- Choose the coating type by purpose: non-stick, low friction, chemical resistance or food contact.
- High-temperature PTFE cure can affect heat-treated or thin parts; bonded lubricants cure cooler.
- PTFE is soft; it is not suited to heavy abrasive wear without reinforced grades.
- Food-contact applications need a food-grade (FDA-compliant) coating.
Frequently asked questions
What is PTFE coating used for?
Mainly non-stick and low-friction surfaces, such as moulds, sealing jaws, food equipment, fasteners and sliding parts, and for resistance to chemicals.
Is PTFE coating food safe?
Food-grade PTFE coatings that comply with FDA requirements are available and widely used on food-processing equipment.
How long does PTFE coating last?
It depends on wear and temperature. In non-stick and low-wear applications it can last years; abrasive conditions wear it faster, and a harder reinforced grade may be better.