Fluoropolymer coatings (Teflon®) are well-known, especially in household products, and their anti-adhesive property is greatly appreciated. Industrial processes have allowed a significant improvement in their performances, and led to their use many industrial cases as part of our range of products Microflon®, Fluoref®, Fluorimid®.
The surface tension of fluororesins (FEP, PFA, MFA, PTFE) prevents all adhesion from: glues, food products, limescale, frost, rubber, epoxy, polyester, diverse melted thermoplastics, thermosettings, fertilizers, cements…
Depending on the case, the chosen coatings have characteristics that can be modified depending on whether we simultaneously encounter bonding & corrosion, bonding & wear, bonding & high temperature. Our experience allows us to make the best choice among possible variations.
Here are some cases of anti-adhesion:
No bonding of elastomer seals with limescale
Anti-adhesion on moulds for plastic materials that allows easy de-moulding, prevents distortion of the parts, and increases production capacity
No clogging of sticky powdered products for parts used in the food sector
Non-adhesion on tools on which liquid paint or powder settles, eventually forming a thick, hard-to-clean crust. Works as a replacement for thermal and chemical stripping on tool parts, in all industries using paints or glues
Up to friction coefficients <0.02: aeronautics, automotive supply industry
It is also possible to benefit from the excellent friction properties of fluororesins on rubbing mechanical parts.
Many types of fluororesins display qualities and have other characteristics, not as well-known as the ones previously mentioned:
Excellent adhesion on metal, light alloys, ceramics, cast iron
Coating accuracy: we have the possibility to handle extremely strict tolerances for fine mechanics. Thicknesses of 3µ +/-1µ can be reached. For thicker treatments, we can for example obtain 10µ +/-3µ. It is even possible to adjust treated materials with a zero clearance fitting (bushel of a cylindrical valve for aeronautics industry).
Under heavy loads, the friction coefficient can reach 0.02. Many applications result from the low static friction coefficient: bonding problems, either metal-metal, or rubber-metal in aeronautics and hydraulics are solved.
Fluorimid®, Fluoref® et Microflon® processes associate fluororesins with fillers aimed at reinforcing the basic resins. They allow metal/metal frictions without galling, without wear and with considerable friction coefficient decrease (down to 0.02). Any mechanical bonding effect is eliminated. Elastomers do not stick on a coated part. The stick slip effect is suppressed.
We generally treat only one part out of two: preferably the male part. The counterpart must have the best possible quality as to its roughness, hardness and geometry. Thermal stabilizations of the parts to be treated have to be considered if geometrical deformations are likely to occur.
This type of coating is applied by liquid spraying.