Three Common Specifications of Vacuum Flanges (CF/KF/ISO)

- Feb 26, 2018-


1. Conflat Flang (CF flange) is a kind of flange connection used in ultra high vacuum. It is a kind of metal static seal which can withstand high temperature baking.

● The CF vacuum joints are suitable for ultra high vacuum applications. The nominal diameter include: DN16, 40, 63, 100, 160, 200, 250.

● The manufacturing standards include: ISO 3669.

The applicable vacuum is up to 10-12mbar.

● The flange sealing materials: Viton, PTFE, copper, etc.

● The flange material: 304, 316 stainless steel etc

● The CF vacuum connector is composed of flange, copper ring.

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2. The KF is a fast unloading flange applied in vacuum system. It consists of the following components: two symmetrically distributed KF flanges, O-ring, centering bracket and clamp. There is no need to use any other tool, simply by twisting the disc nut with the hand to loosen or tighten the connection.

● The KF vacuum joint is a small size fast mounted flange joint. The nominal diameter size includes: DN 10, 16, 25, 40, 50.

● The manufacturing standards include: DIN 28403, ISO 2861.

● The applicable vacuum is up to 10-8mbar.

● The flange sealing material: Viton, Buna, Silicone, EPDM, Al etc.

● The flange materials: 304, 316 stainless steel etc.

● The KF vacuum connector is composed of flang, clamp, O-Ring and centering ring.


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3. The ISO flanges and piping can be used in a variety of applications from atmospheric pressure to high vacuum. The diameter of tube is over 50mm (2 in.). If using Viton O-ring, it can be baked at 150℃. The two commonly used forms of ISO flanges are ISO-K and ISO-F.

● ISO-K and ISO-F vacuum joint is large-size vacuum joints. The nominal diameter size includes: DN 63, 100, 160, 200, 250, 320, 400, 500 and 630.

● The manufacturing standards include: DIN 28404 ISO 1609.

● It can be applied to an occasion which vacuum degree is up to 10-8mbar.

● The flange sealing materials: Viton, Buna, Silicone, EPDM, Al etc.

● The flange materials: 304, 316 stainless steel etc.


(1) The ISO-K vacuum connector is composed of flang, clamp, O-Ring and centering ring.

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(2) The ISO-F vacuum connector is composed of flang, O-Ring and centering ring. The difference with ISO-K is that the flange is bolted.

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