Specifications And Difference Of Three Common Vacuum Flange (CF, KF, ISO)

- Jun 08, 2018-


1. CF Flange

 

CF flange refers to Conflat Flang, a flanged connection that used in ultra-high vacuum. It is a kind of metal static seal that can withstand high temperature baking.

 

The nominal diameter size includes DN16, 40, 63, 100, 160, 200, 250.

 

Applicable vacuum degree is up to 10-12 mbar

 

The material of flange seal is usually Viton, PTFE, oxygen free copper, etc.

 

The material of flanges is usually 304, 316 stainless steel.

 

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2. ISO-KF

 

ISO-KF is a kind of quick release flange used in vacuum systems. It consists of two symmetrically distributed KF flanges, O-Ring, centering brackets, and clamps. There is no need to use any other tool but simply unscrew the dish nut by hand to loosen or press the connection.

 

ISO-KF vacuum fittings are small-size quick-fit flanged connectors. Nominal diameter sizes include DN 10, 16, 25, 40, 50.

 

Manufacturing standards include DIN 28403, ISO 2861.

 

Applicable vacuum degree is up to 10-8 mbar.

 

The material of flange seal is usually Viton, Buna, Silicone, EPDM, aluminum, etc.

 

The material of flange is usually 304, 316 stainless steel, etc.

 

ISO-KF vacuum joints are usually composed of flange, clamp, O-Ring and centering ring, as the figure below.

 

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3. ISO Flange

 

ISO flanges and its tubing can be used in a wide range of applications from atmospheric pressure to high vacuum, often for assembly and disassembly. The diameter of a typical pipe is more than 50mm (2 inches). If using fluorine rubber O-rings with it, it can withstand 150 °C baking.

 

Two commonly used ISO flanges are ISO-K and ISO-F

 

ISO-K and ISO-F vacuum fittings are large-size vacuum fittings with nominal diameter sizes including DN 63, 100, 160, 200, 250, 320, 400, 500 and 630.

 

Manufacturing standards include DIN 28404, ISO 1609.

 

It can be used where vacuum is required up to 10-8 mbar.


The material of flange seal is usually Viton, Buna, Silicone, EPDM, aluminum wire, etc.

 

The material of flange is usually 304, 316 stainless steel, etc.

 

a. ISO-K vacuum fittings usually consist of flange, clamp, O-Rings, and centering ring as the figure below.


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b. ISO-F vacuum fittings usually consist of flange, O-Ring and centering ring. Unlike ISO-K, ISO-F flanges are sturdy with bolts as the figure below.


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