an outstandingly even surface finish, especially when compared to the methods used on large diameter seals,” explains Frick. “We can offer flash heights down to ISO 3601-3, grade S or N, depending on the customer’s requirements and the material chosen, while providing very high surface qualities depending on the material and production method.” “When combined with large
diameter O-rings produced by Trelleborg’s FlexiMold process, Flexfinish can result in cost-effective sealing solutions that can give outstanding leak-tightness when sealing in a vacuum or with gas,” concludes Frick. Flexfinish is available globally for
O-rings with inside diameters greater than 200mm/7.874 in in FKM, NBR and EPDM materials and with other materials. O-rings can be provided to standard cross-sections according to ISO 3601-1 with other sizes available on request.
Large diameter seals O-rings manufactured using the FlexiMold process offer the full visual and dimensional integrity of a moulded product and are available from 500mm/20in to almost infinite diameters or in ISO 3601-1, AS568 and JIS B 2401 standard sizes.
When designed to a standard size, no additional tooling costs are charged. They are available in a wide variety of elastomer materials, including the proprietary Isolast FFKM range and high performance Resifluor fluoroelastomers. The International Organization for
Standardization (ISO) is a worldwide federation of national standards bodies that establish technical committees that prepare international standards on a wide range of topics.
M
any existing surface finishing processes, though offering excellent leak-free operation in many
applications, do not offer the levels of surface quality that vacuum and toxic gas operations require.
ISO 3601-3 describes the quality acceptance criteria for O-rings as well as defining, classifying and providing acceptable limits for surface imperfections. Three grades exist to characterise acceptable limits for different application requirements.
Seals for mutual trust Seals from Trelleborg must stand up to millions of cycles in Arburg injection moulding machines. That’s one reason why Trelleborg’s production facilities are
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Flexfinish provides a surface finish for high vacuum environments or for applications including explosive and toxic gases.
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