These are the backelite flange which are light in weight and used between the joint of glass pipe sections. These are available in size 1’’to 12’’. These are usually used in pharmaceutical industries so that it doesn’t have the rust.
The Flanges are used in glass process plant . These are made from Investment casting. They are available in C I, SS and Bakelite. The joint between the glass, these flanges are assembles through nut and bolt and make the glass assembly under full vacuum.