Schott flanges are available in five sizes. They are called out by their inside dimensions, and range from 60mm ID to 200mm ID. The three configurations shown in the photo on the right are standard off-the-shelf components. Typically, a vessel will utilize one o-ring flange with either a flat flange or a "domed" or "lid" blank flange. Many configurations are possible, including custom machined interfaces.

A stainless steel wraparound toggle clamp holds the flanges together, with an o-ring between the mating parts. This photo shows how the shape of the clamp conforms to the shape of the glass flanges. There are a number of o-ring choices, including viton and teflon encapsulated silicone. An o-ring compatability chart can be referenced here.

An example of  a custom interface between a DN200 Schott flange component and a base machined from teflon utilizing the Schott clamp. This approach can be used for a "head" as well.  In addition to teflon, stainless steel is an alternative material interface, and can be machined to provide drive support and vessel porting.

This photo shows a custom glass vessel utilizing DN200 flanges. An all glass "head" is constructed on a DN200 "lid", and a DN200 o-ring flange is fused on a 50L round bottom flask. The unit is easily assembled, and easy to clean.

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