Caustic Soda (NaOH) service
Material Compatibility

Carbon Steel for Caustic Soda (NaOH)

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

Good

Is Carbon Steel compatible with Caustic Soda (NaOH)?

For Caustic Soda (NaOH) (NaOH) valve service, Carbon Steel is good — a good choice. Acceptable up to 50% NaOH at ambient temperature. Not for hot concentrated caustic.

Better materials for Caustic Soda (NaOH)

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

Nickel 200/201ExcellentPTFE-linedExcellentMonel 400GoodRubber-lined (natural rubber/EPDM)Good

All rated materials for Caustic Soda (NaOH)

Nickel 200/201ExcellentPTFE-linedExcellentMonel 400GoodRubber-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 & standardsCarbon Steel compatibilityEvery fluid this material handlesCompatibility AtlasThe full material x fluid matrix