Caustic Soda (NaOH) service
Material Compatibility

Monel 400 for Caustic Soda (NaOH)

Is Monel 400 the right valve material for Caustic Soda (NaOH)? The engineering rating, the conditions that limit it, and the better alternatives.

Good

Is Monel 400 compatible with Caustic Soda (NaOH)?

For Caustic Soda (NaOH) (NaOH) valve service, Monel 400 is good — a good choice. Good for hot caustic service - preferred where Nickel 200 is cost-prohibitive.

Better materials for Caustic Soda (NaOH)

Higher-rated options for this service, from the compatibility data.

Nickel 200/201ExcellentPTFE-linedExcellentCarbon SteelGoodRubber-lined (natural rubber/EPDM)Good

All rated materials for Caustic Soda (NaOH)

Nickel 200/201ExcellentPTFE-linedExcellentCarbon SteelGoodRubber-lined (natural rubber/EPDM)GoodSS 316LFairAluminium alloysNot Recommended
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Materials
A216 WCB Carbon SteelMonel 400
Tools
Material Compatibility

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Engineering references

Caustic Soda (NaOH) service guideFull compatibility, valves & standardsMonel 400 compatibilityEvery fluid this material handlesCompatibility AtlasThe full material x fluid matrix