Material Compatibility Reference

PTFE-lined — Fluid Compatibility

Which industrial fluids PTFE-lined valves can handle — rated across 9 process media with engineering notes. The compatibility reference for specifying PTFE-lined body and trim.

What fluids is PTFE-lined compatible with?

PTFE-lined is rated across 9 industrial fluids in our compatibility data. It performs well in Acetic Acid (CH₃COOH), Brine / Sodium Chloride Solution, Caustic Soda (NaOH), Demineralised Water (DM Water / Deionised Water), Hydrochloric Acid (HCl), Sulphuric Acid (H₂SO₄). Full ratings and notes below — always confirm against concentration, temperature and velocity.

Material grades & metallurgy

PTFE / FEP Lining (ASTM D1457 / BS 6564)PTFE / FEP-Lined Valves

Excellent6 fluids

Acetic Acid (CH₃COOH)Excellent for all concentrations at moderate temperature.

Brine / Sodium Chloride SolutionInert to brine at all concentrations.

Caustic Soda (NaOH)Chemically inert to all NaOH concentrations.

Demineralised Water (DM Water / Deionised Water)Zero contamination - preferred for semiconductor and ultra-high purity DM water.

Hydrochloric Acid (HCl)Inert to all HCl concentrations.

Sulphuric Acid (H₂SO₄)PTFE is excellent across all concentrations and temperatures up to 200°C.

Good2 fluids

Phosphoric Acid (H₃PO₄)Excellent for clean phosphoric acid. Caution with fluoride-bearing wet process acid at elevated temperature.

Urea Solution (Carbamide / DEF / AdBlue)Acceptable for dilute urea (DEF/AdBlue) service.

Fair1 fluids

Slurry - Abrasive Pulp / Mineral SlurryPTFE has poor abrasion resistance - not for high-velocity or coarse abrasives.

Reviewed by Materials Engineering, Vajra Industrial SolutionsDiscipline: Valve Metallurgy & Materials SelectionLast reviewed: 20 June 2026

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