This replacement membrane is suitable for almost all common 50l expansion tanks used in sanitary cold and hot water networks, heating and air conditioning systems, domestic water installations, solar installations, to maintain thepressure and for irrigation pumps.It is made of BUTYL and therefore suitable for drinking water.This rubber is part of the group of elastomers. It is characterized by its constancy to hot air, bad weather and the influence of ozone.It is low gas permeability, resistant to chemicals and has good vibration or shock damping properties up to 100 degrees.It is particularly used for inner tubes, the inside of tires, membranes or steam pipes, or certain interior linings of tanks or tanks, protective films, unvulcanized sealing compound and straps or ties.