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  • 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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