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ASTM Committee developing standard for knife-edge flanges.

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December 17, 2008 - Since no industry standard currently exists that addresses vacuum sealing requirements of knife-edged flanges for high vacuum applications, ASTM International Committee E42 on Surface Analysis is working on proposed standard WK21206, "Specification for Dimensions of Knife-Edge Flanges." Standard will allow for consistency between manufacturing that would enable interchangeability of hardware and would also capture best practices and result in best performing seal.

ASTM Surface Analysis Committee Developing Standard for Knife-Edge Flanges

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ASTM International
100 Barr Harbor Dr., Box C700
West Conshohocken, PA, 19428-2959

Press release date: December 15, 2008

W. CONSHOHOCKEN, Pa., 15 December 2008-No industry standard currently exists that addresses the vacuum sealing requirements of knife-edged flanges for high vacuum applications. Existing international standards focus on interchangeability of the hardware, but do not address the reliability of the seal. ASTM International Committee E42 on Surface Analysis is now working on a proposed standard on the subject, WK21206, Specification for Dimensions of Knife-Edge Flanges. The proposed standard is being developed by Subcommittee E42.13 on Vacuum Technology.

"Since there is no consensus standard for the appropriate dimensions of flanges, the users either do not specify dimensions and leave the possibility that the product is not suited for high vacuum application or they develop their own specification, which may not conform to manufacturing norms," says Stuart Tison, vice president, business development, Entegris Inc., and chair of E42.13. "Both scenarios ultimately result in higher cost for the end user." Tison says that the proposed standard will allow for consistency between manufacturing that would enable interchangeability of hardware and would also capture best practices and result in the best performing seal.

Primary users of the standard will be the electronics, aerospace and research industries. In addition, manufacturers of vacuum hardware will use the standard to comply with industry norms. A subcommittee task group has been formed to develop the standard. Participation is welcome in the ongoing development of WK21206, particularly from potential users.

For technical Information, contact Stuart Tison, Entegris Inc., Chaska, Minn. (phone: 972-672-6401; Committee E42 meets Nov. 8, 2009, in conjunction with the AVS 56th Annual Symposium in San Jose, Calif. For ASTM meeting or membership information, contact Brynn Murphy, ASTM International (phone: 610-832-9640;

Established in 1898, ASTM International is one of the largest international standards development and delivery systems in the world. ASTM International meets the World Trade Organization (WTO) principles for the development of international standards: coherence, consensus, development dimension, effectiveness, impartiality, openness, relevance and transparency. ASTM standards are accepted and used in research and development, product testing, quality systems and commercial transactions around the globe.
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