Seals and Gaskets

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Seals and Gaskets        Seals and Gaskets

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Bostec Engineering Bostec Engineering, Inc. - www.bostecengineering.com
- 1311 Hermosa Avenue, Hermosa Beach, CA 90254, USA

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products:   CF gaskets

Bostec CF gaskets are a high-precision, annealed alternative to conventional, stamped CF gaskets that are unsuitable for ultra-pure or reactive gas environments.

Each Bostec CF gasket is laser cut and then machined on all sides to a fine finish with smooth edge transitions and no burrs. This ensures that the gas path around the ID of the gasket is fully swept and that entrapped or generated particles are minimized. The mating surfaces of each gasket are machined with a precise circular ring pattern, flat to 10RA, that helps the knife edge seat into the gasket for a perfect seal. Bostec CF gaskets conform to SEMI F19 and ASTM B46.1. Dimensional conformity is held to close tolerances and each gasket is temperature annealed in a special process that leaves the part with an ultra-bright appearance and in a dead-soft condition. Dead-soft gaskets are easier on your mating parts and help extend gland life. Our annealing process also strips the gasket of surface contaminants such as carbon, sulfur and other trace elements.
Bostec gaskets are produced from solid raw material and are not plated. For reactive gas conditions, we recommend solid nickel 200/201. Solid OFHC copper, aluminum 1100 and specialty alloys are also available.


Duniway Duniway Stockroom Corporation - www.duniway.com
- 48501 Milmont Drive, Fremont, CA 94538, USA

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products:   Copper and Silver Conflat Gaskets

All of our gaskets are made from high-purity, electronic grade oxygen-free copper alloy 101 (99.99% pure), 1/4-hard temper, Rockwell 63-83 hardness, ASTM F 68-77, ASTM B 152-79.

Gaskets are punched dry, but the dyes are wiped with a vanishing cutting fluid which comes in contact with the gasket. It evaporates, leaving no residue. Nicks or scratches shall not exceed .0005" deep, or .003" wide. Burrs shall not exceed .002".

We also offer silver-plated copper gaskets designed to prevent oxidation at high temperatures.


Technetics Technetics Group - www.technetics.com
- 2791 The Boulevard, Columbia SC 29209, USA

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products:   DELTA® Spring Energized Metal Seals

The DELTA® seal is a member of the HELICOFLEX® family of spring energized seals. The sealing principle of the HELICOFLEX® family of seals is based upon the plastic deformation of a jacket that has greater ductility than the flange materials. This occurs between the sealing face of a flange and an elastic core composed of a close-wound helical spring.
The spring is selected to have a specific compression resistance. During compression, the resulting specific pressure forces the jacket to yield and ensures positive contact with the flange sealing faces. Each coil of the helical spring acts independently and allows the seal to conform to irregularities on the flange surface.
The DELTA® seal is unique in that it uses two small ridges or “Deltas” on the face of the seal. The load required to plastically deform the jacket material is greatly reduced by concentrating the compression load on the Deltas. The resulting high contact stress in the seal track makes the DELTA® seal an excellent choice for ultra-high vacuum applications that require ultra-low Helium leak rates. There is typically no risk of damaging the flange sealing surfaces as long as the minimum hardness requirements are maintained.




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