For sodium hypochlorite solutions, a diaphragm pressure gauge should be used; what material should the diaphragm be made of?
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Dear experts, may I ask: for a diaphragm pressure gauge used with sodium hypochlorite solutions, what materials are best suitable for the diaphragm and the liquid-contacting parts? What material is suitable for diaphragms used with pure liquid chlorine and dry chlorine gas?
Non-metallic coating? It also depends on the temperature; if it’s too high, the coating may not be suitable
Sodium hypochlorite solution diaphragm pressure gauge; the diaphragm and liquid-contacting parts can be made of polytetrafluoroethylene or ceramic. Since sodium hypochlorite has strong oxidizing properties, ordinary metal materials such as stainless steel are easily corroded by it, whereas polytetrafluoroethylene and ceramics possess excellent corrosion resistance and are therefore more suitable. For pure liquid chlorine or dry chlorine gas, the diaphragm and liquid-contacting parts of the diaphragm pressure gauge can be made of Hastelloy or titanium. These two materials possess excellent corrosion resistance and high-temperature resistance, enabling them to meet the requirements associated with liquid chlorine and dry gas. .
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