Find the most alkali-resistant rubber type
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I’d like to ask the experts here – we’re only considering alkali-resistant rubber! When the alkali concentration is greater than 95%, which is better: EPDM or fluororubber?
For alkalis on pumps, fluororubber is generally used, right?
Fluororubber is not resistant to alkalis; use tetrafluoro instead
Resistance to acid and alkali corrosion: PBI (polybenzimidazole) > perfluoroelastomers > tetrafluoropropylene rubber > fluorosilicone rubber > fluororubber > hydrogenated nitrile rubber > butyl rubber > ethylene-propylene-diene monomer rubber; nylon is resistant to oil, wear, and aging. Polytetrafluoroethylene (PTFE) is resistant to corrosion but not to wear, and it exhibits cold flow.
The temperature needs to be considered; perfluoroethers are the first choice, followed by AFLAS. When the temperature is high, special perfluoroethers must be used; the concentration of the base is too high.
Aflas is Nippon Glass’ tetrapropyl fluoride.