Coating seals

Busak + Shamban material technicians have developed two new coatings to address the problems associated with the use of elastomeric O-Rings in automated assembly.

Recognising the increasing use of common O-Rings in the domestic appliance and automotive component sectors, Busak + Shamban material technicians have developed two new coatings to address the problems associated with the use of elastomeric O-Rings in automated assembly.

The MF coating, developed for use with traditional elastomer O-Rings in static sealing applications, is a transparent PTFE-based coating which reduces the friction often encountered with dry sealing surfaces, helping to avoid the problem of seal-stick during automated assembly. A further benefit is the reduction in seal damage during the assembly process – a critical factor in a one-time installation of the seal.

The LF coating, on the other hand, offers further reductions in friction making O-Rings coated with it suitable for use in dynamic applications where increased frictional forces are encountered. Though LF coating offers the same benefits as MF coating in automated assembly, tests indicate that the resilience of the LF coating makes possible repeated re-installation of LF coated seals with no resultant damage. Furthermore, the LF coating can prevent premature failure of the seal in case dry running occurs.

The coatings, which do not exhibit cracking when the O-Ring is stretched, can be applied to almost any elastomer. Being solvent-free, they are environmentally friendly and compliant with requirements relating to VDA 232-101.

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