Caustic Soda (NaOH) service
Material Compatibility

SS 316L for Caustic Soda (NaOH)

Is SS 316L the right valve material for Caustic Soda (NaOH)? The engineering rating, the conditions that limit it, and the better alternatives.

Fair

Is SS 316L compatible with Caustic Soda (NaOH)?

For Caustic Soda (NaOH) (NaOH) valve service, SS 316L is fair — acceptable with limits. Risk of caustic SCC above 60°C. Cold dilute service only - verify.

Better materials for Caustic Soda (NaOH)

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

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

All rated materials for Caustic Soda (NaOH)

Nickel 200/201ExcellentPTFE-linedExcellentCarbon SteelGoodMonel 400GoodRubber-lined (natural rubber/EPDM)GoodAluminium alloysNot Recommended
Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

Connected Engineering

Materials
A216 WCB Carbon SteelA351 CF8M (SS316)Monel 400
Tools
Material Compatibility

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Engineering references

Caustic Soda (NaOH) service guideFull compatibility, valves & standardsSS 316L compatibilityEvery fluid this material handlesCompatibility AtlasThe full material x fluid matrix