What material gasket should be used for the flange on the NaOH container? Please ask an expert to help answer
Thread Content
What material should be used for the gasket on the flange of the container holding NaOH? Where can I find relevant information?
If the temperature isn’t high, a PTFE gasket should work.
This depends on the NaOH concentration; stainless steel is used for high concentrations, while carbon steel can be used for lower concentrations. In addition, attention must also be paid to the operating temperature to prevent alkali embrittlement of carbon steel materials
This post was last edited by Keep running on 2016-12-14 10:10. Are there any requirements regarding intensity? Heat-resistant nickel-chromium-iron alloys from the Incoloy series can be used as gaskets; Incoloy is suitable for sulfuric acid at various concentrations at low temperatures ； It exhibits good corrosion resistance in caustic alkali solutions (such as NaOH) with concentrations of 50% to 70%, and does not suffer from stress corrosion cracking. Incoloy is a nickel-chromium-iron alloy designed to resist oxidation and carburization as temperature rises. There are many types of Incoloy alloys: common ones include Incoloy800, Incoloy800H, Incoloy800HT, Incoloy825, Incoloy840, Incoloy901, Incoloy925, Incoloy20, Incoloy330, Incoloy 25-6Mo, etc.
Use non-metallic gaskets. Such as Teflon gaskets, PTFE gaskets, etc.
It is necessary to consider the medium flowing through, the type of sealing surface on the flange, the material of the flange, as well as the temperature in order to determine what gasket to use
Metal wound gaskets are a good choice; material 304 will suffice.
For equipment and pipelines at atmospheric pressure, PTFE gaskets can be used; our company’s sodium hydroxide storage tanks are made of PE square tanks, with a concentration of 20-40%
I’ve learned it.* . . . . . . . .