Coatings improve O-ring performance
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Trelleborg Sealing Solutions UK product story
Edited by the Engineeringtalk editorial team
Jul 16, 2003
Two new coatings provide performance, installation, environmental and cost benefits for O-rings, together with handling advantages in automated assembly processes.
Two new coatings provide performance, installation, environmental and cost benefits for O-rings, together with handling advantages in automated assembly processes.
Recognising the increasing use of common O-rings in automated assembly of products, particularly in the domestic appliance and automotive component sectors, Busak+Shamban material technicians have developed two new coatings, both with advanced characteristics, to address the problems associated with the use of elastomeric O-rings in automated assembly.
MF coating, developed for use with traditional elastomer O-rings in static sealing applications, is a transparent PTFE-based coating which greatly reduces the friction so often encountered with dry sealing surfaces and thus helps to avoid the problem of seal-stick during automated assembly.
A further benefit, gained through the application of this high-tech micro coating, is the significant reduction in seal damage during the assembly process - a critical factor in a one-time installation of the seal, within a closed design envelope.
LF coating offers further reductions in friction making these coated O-rings suitable for use in dynamic applications, where increased friction forces are encountered.
Although 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, LF coating will continue to function long after installation, preventing premature failure of the seal in case dry running occurs.
Both MF and LF coatings negate the use of costly friction-reducing lubricants and the associated environmental contamination.
This, combined with the elimination of "assembly damaged seals" and consequential costs, makes the use of Busak+Shamban MF and LF coated O-rings a viable design and production proposition.
The coatings, which do not exhibit cracking when the O-ring is stretched, can be applied to almost any elastomer and being solvent-free are environmentally friendly and compliant with requirements relating to VDA232-101.
In particular, the coatings offer an expanded field of application for inexpensive elastomer seals and, additional to the characteristics previously described, provide quality assurance benefits.
Prior to the first application, the transparent layer glows purple under ultraviolet light.
In addition to this ultraviolet active layer offering speedy distinction between coated and uncoated seals of the same type and size, the feature provides manufacturers the opportunity to use detection equipment for checking seal installation.
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