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Copper Gaskets

Copper Gasket - Annealed

A Copper Gasket is used to mate two Conflat (CF) vacuum flanges together. The CF flange is the most widely used flange type for high vacuum and UHV applications. These flanges must be the same outer dimension. Almost all of our feedthroughs and fittings are available on this flange system.

Copper Gasket - Annealed

A Copper Gasket is used to mate two Conflat (CF) vacuum flanges together. The CF flange is the most widely used flange type for high vacuum and UHV applications. These flanges must be the same outer dimension. Almost all of our feedthroughs and fittings are available on this flange system.

All of our Copper Gaskets are OFHC (Oxygen-Free High Conductivity) copper alloy 101 (99.99% Pure copper). The gaskets are punched from a copper plate, chemically cleaned, and then packaged to minimize scratches and burs. These Copper Gaskets are designed to be used in the industry standard "captured copper gasket" sealing principle. See the drawing to the left to get a visual representation of how the copper gasket is used by utilizing the knife edge of the flange. This is how it creates the seal between two mating flanges. This is a standard sealing method throughout the scientific vacuum industry.

Although we do not carry Silver, Gold platted copper, Aluminum, or Nickel gaskets, we would be happy to source them for you. Just request them via our contact us page.

Copper Gasket Specifications:

  • Can withstand elevated temperature indefinitely
  • OFHC copper alloy 101 (99.99%) material
  • ¼-Hard temper Rockwell 63-83 Hardness factor
  • ASTM F 68-77 ASTM B 152-79
  • Nicks or scratches shall not exceed .0005” deep, or .003” wide.
  • Burrs shall not exceed .002”

Our line of OFHC (Oxygen-Free High Conductivity) copper gaskets consists of sizes from 1.33" to 16.50" to fit any of our Conflat (CF) flanged feedthroughs, fitting, components and accessories.

Are you looking for Viton Gaskets instead? We carry those also.

Please select a copper gasket below to view detailed information about that size.

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113290
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$28.00

Gasket Clip Set for CF Flanges / Fits all Conflat® CF Flange sizes, 2 Clips per package.

$28.00
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200730
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$17.00

1.33" CF Conflat® flange, OFHC copper gasket, 0.64 ID. 10 per package.

$17.00
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200740
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$18.00

2.12" CF Conflat® flange, OFHC copper gasket, 1.00 ID.10 per package.

$18.00
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200760
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$19.00

2.75" CF Conflat® flange, OFHC copper gasket, 1.45 ID.10 per package.

$19.00
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200761
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$27.00

2.75" CF Conflat® flange, OFHC copper gasket, 1.53 ID. Larger ID for use with flange that may have multiple feedthroughs. Used for extra clearance.10 per package.

$27.00
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200780
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$22.00

3.38" CF Conflat® flange, OFHC copper gasket, 2.01 ID.10 per package.

$22.00
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200810
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$34.00

4.50" CF Conflat® flange, OFHC copper gasket, 2.51 ID.10 per package.

$34.00
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200820
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$41.00

4.50" CF Conflat® flange, OFHC copper gasket, 2.80 ID.10 per package.

$41.00
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200830
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$37.00

4.62" CF Conflat® flange, OFHC copper gasket, 3.01 ID.10 per package.

$37.00
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200850
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$47.00

6.00" CF Conflat® flange, OFHC copper gasket, 4.01 ID.10 per package.

$47.00
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200851
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$65.00

6.00" CF Conflat® flange, OFHC copper gasket, 4.12 ID.10 per package.

$65.00
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200870
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$53.00

6.75" CF Conflat® flange, OFHC copper gasket, 5.01 ID.10 per package.

$53.00
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200880
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$64.00

8.00" CF Conflat® flange, OFHC copper gasket, 6.01 ID.10 per package.

$64.00
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200900
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$88.00

10.00" CF Conflat® flange, OFHC copper gasket, 8.00 ID.10 per package.

$88.00
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200921
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$46.00

12.00" CF Conflat® flange, OFHC copper gasket, 10.0 ID.1 piece per package.

$46.00
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200920
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$400.00

12.00" CF Conflat® flange, OFHC copper gasket, 10.0 ID.10 per package.

$400.00
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200911
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$49.00

13.25" CF Conflat® flange, OFHC copper gasket, 10.8" ID.1 per package.

$49.00
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200910
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$420.00

13.25" CF Conflat® flange, OFHC copper gasket, 10.8" ID.10 per package.

$420.00
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200931
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$60.00

14.0" CF Conflat® flange, OFHC copper gasket, 11.56" ID.1 per package.

$60.00
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200930
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$590.00

14.0" CF Conflat® flange, OFHC copper gasket, 11.56" ID.10 per package.

$590.00
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200941
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$64.00

16.5" CF Conflat® flange, OFHC copper gasket, 14.11" ID.1 per package.

$64.00
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200940
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$620.00

16.5" CF Conflat® flange, OFHC copper gasket, 14.11" ID.10 per package.

$620.00