Caustic Soda (NaOH) service
Material Compatibility

Aluminium alloys for Caustic Soda (NaOH)

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

Not Recommended

Is Aluminium alloys compatible with Caustic Soda (NaOH)?

For Caustic Soda (NaOH) (NaOH) valve service, Aluminium alloys is not recommended — not recommended. Rapidly attacked at all concentrations.

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)GoodSS 316LFair
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 & standardsCompatibility AtlasThe full material x fluid matrix