The small flange connection developed by Leybold has become the basis of the international standard for vacuum technology.

The CF flange connection consists of two geometrically identical flanges with a flat gasket made of OFHC copper, bolts and nuts and washers. CF components are made of selected, corrosion resistant types of stainless steel. All components are inside welded to prevent right from the beginning any cracks or pocket holes which might constitute a so-called virtual leak.