PTFE stands for PolyTraFluoroEthylene.
PTFE was invented in 1938 by an employee of DuPont USA. It was discovered by accident that a fluoropolymer-based coolant had polymerized into a solid. This material proved to be resistant to acids, solvents, and both high and low temperatures. It was also discovered that PTFE has a very low coefficient of friction. It was subsequently used primarily in the defense, aviation, and nuclear industries. It became best known under DuPont’s Teflon brand name, and to consumers primarily through “Teflon-coated pans.”
PTFE can be produced in a variety of colors and provides excellent corrosion protection. It can be used at temperatures up to 260°C, and proper surface preparation is essential for a good end result. After surface preparation, the material is treated with a primer, followed by the PTFE layer. The entire coating system is then cured at high temperature, causing the coating layers to fuse together. This ensures it meets the requirements set by industries such as offshore and (petro)chemical.
The properties one can achieve are very diverse:
- Very low coefficient of friction
- High corrosion resistance
- Self-cleaning
- No squeaks and creaks
- High chemical resistance
- Many colors are available, making it easy to distinguish between products that look identical—whether for decorative purposes or simply for identification. For example, bolts and nuts of different grades and tensile strengths can be easily identified this way.
- No stick slip, no film adhesion in sealing processes
- Antibacterial coatings are possible
- Electrically conductive coatings are possible
- Coatings with food approval and drinking water approval are possible
Xylan® 1070 from Whitford is a ptfe coating, also called a fluoropolymer coating, based on an organic solvent and was developed in the early 1970s primarily for coating fasteners.
For materials treated by us, it normally consists of 2 layers, they are “treated” 2x.
Together with proper pretreatment, for example Whitford primer 4090, it provides excellent corrosion-protection, neutral salt spray test up to 3,000 hours.
The layer thickness of this coating is usually about 25mu (from 20 to 60 mu) and the processed materials can be used at temperatures from -195°C to +260°C.
Major industrial applications include:
- Bolts, nuts, studbolts for in the oil and gas, (petro)chemical, and wind energy industries
- Sealing knives and beams in the packaging industry
- Valves in pipelines
- Conveyor systems in the food industry
- Machines in the dough industry and in bakeries
- Trays in the ink and printer industry
- Robot arms, moving parts that must always function
- Nozzles in the plastic injection molding industry
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