An O-ring coating is used to facilitate the assembly process as well as to reduce the friction (friction coefficient) during dynamic processes. In the past, this coating was taken over by classic lubricants such as oils and fats. In recent years, the O-ring coating and the dry lubrication with bonded coatings in this area is becoming more and more important. The application of a bonded coating offers, in comparison to normal lubrication, above all the advantage that an automated mass partial coating can take place. Furthermore, an O-ring coating leaves a clean, dry component surface. Other applications include shaft sealing rings, the use in sealing elements in valves to facilitate assembly. Almost all elastomers (eg NBR, EPDM, ACM, VMQ) can be coated. The solid lubricants are bound in an O-ring coating, which reduces the friction coefficients of the sealing material and significantly reduces the force required during assembly operations. For dynamically moving components, the coating prevents the occurrence of stick-slip effects and thus avoidance of squeaking noises. An O-ring coating is usually carried out as partial mass coating (dipping, drums or similar). On the surface of the coated components remains a firmly adhering, dry lubricating paint film (dry lubrication) with a layer thickness of a few microns.
The advantages of an O-ring coating are:
- permanently low coefficient of friction
- lasting good dry running properties
- no stick-slip effect
- improved aging resistance
- can be used in dynamic applications
- can be applied to parts of the rubber seal