CF Flange, KF Flange and ISO Flange Difference

The standard parts of vacuum flange (vacuum gauge) are mainly accessories used in vacuum system with different connection methods.

The most common are CF flanges, KF flanges and ISO flanges.

CF Flange

CF flange refers to ConFat Flange. It is a flange connection used in ultra-high vacuum, a metal static seal that can withstand high temperature. The applicable vacuum is up to 10-12 mbar, and the flange materials are usually stainless steel 304, stainless steel 316, etc.

ISO-KF Flange

ISO-KF flange is a quick release flange used in vacuum systems. It consists of the following components: two symmetrically distributed KF flanges, O-Rings, centering brackets, and clamps. No additional tools are required to loosen or compress the coupling by simply turning the disc nut by hand. The applicable vacuum is up to 10-8 mbar, and the flange materials are usually stainless steel 304,stainless steel 316, etc.

ISO Flange

ISO flanges and piping can be used in a variety of applications, from atmospheric pressure to high vacuum, that are often assembled and disassembled. Typically the diameter of the pipe exceeds 50mm (2 inches). It can withstand temperature 150°C if Viton O-rings are used.

The two commonly used are ISO-K flange and ISO-F flange, which are large-sized vacuum joints that can be used in applications requiring a vacuum of up to 10-8 mbar.

ISO-K vacuum joints are usually composed of flanges, clamp, O-Rings, and centering rings.

ISO-F vacuum joints are usually composed of flanges, O-Rings, and centering rings. The difference from ISO-K flange is that ISO-F flanges are sturdy with bolts.

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