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How should we choose the right rubber expansion joints?

Rubber expansion joints are used in connection of pipes.
So ,we need to know the media,Installation distance and Standard of flange drilling to choose the right rubber expansion joints.
Different pipe media corresponding to different rubber materials.such as EPDM, Butyl, Nitrile, Chlorobutyl, Hypalon®, Neoprene,Viton®, natural rubber etc.
Installation distance determines the length of rubber expansion joints.
Rubber expansion joints are connected by a flange, so drilling standard flange and pipe must be consistent.such as ANSI 150#/ASME, DIN, BS, and JIS as well as others.