Caustic Soda (NaOH) service
Material Compatibility

PTFE-lined for Caustic Soda (NaOH)

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

Excellent

Is PTFE-lined compatible with Caustic Soda (NaOH)?

For Caustic Soda (NaOH) (NaOH) valve service, PTFE-lined is excellent — an excellent choice. Chemically inert to all NaOH concentrations.

Better materials for Caustic Soda (NaOH)

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

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

All rated materials for Caustic Soda (NaOH)

Nickel 200/201ExcellentCarbon SteelGoodMonel 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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Send your concentration, temperature and pressure — we confirm PTFE-lined suitability for Caustic Soda (NaOH) (or recommend an upgrade) and supply with full certification.

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Engineering references

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