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Revitalizing Donut Seals

IP.com Disclosure Number: IPCOM000086282D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fink, OJ: AUTHOR [+2]

Abstract

In the out-gassing and baking out as well as the filling process utilized for gas panels, a VITON* "A" donut is used to vacuum seal the display panel to the vacuum port. Under normal usage the seal has an expected life of between thirty and forty hours and then must be thrown away. Described below is a process for revitalizing the donut seal to extend its life by at least four times.

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Revitalizing Donut Seals

In the out-gassing and baking out as well as the filling process utilized for gas panels, a VITON* "A" donut is used to vacuum seal the display panel to the vacuum port. Under normal usage the seal has an expected life of between thirty and forty hours and then must be thrown away. Described below is a process for revitalizing the donut seal to extend its life by at least four times.

First the donuts are agitated in isopropyl alcohol to remove any surface particles thereon and then rinsed in CHCL(3) (chloroform). Thereafter, the seals are baked at 230 degrees C for a minimum of two hours under a vacuum of approximately 30 inches of mercury. After cooling, the VITON donuts regain their physical shape and may be reused for high-vacuum connections. * Trademark of E. I. du Pont de Nemours & Co.

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