Huiya · Material selector
Plastic valve chemical resistance selector
This interactive plastic valve chemical resistance chart checks your medium against UPVC, PPH, FRPP, CPVC and PVDF across the full temperature range. Unlike a static PDF, it recommends the lowest-cost material that is fully resistant at your temperature — so you specify CPVC or UPVC where they hold, and PVDF only where it is truly needed.
Example — search your own medium above ↑
Full engineering reference — UPVC, CPVC, PPH, PVDF and FRPP with EPDM, FKM and PTFE seats, across temperatures up to 120°C.
Download the PDF chart →Material guide: plastic resistance by chemical
Open the quick guide — recommended material by temperature for common media
Huiya makes valves and pipe in every material below, so this guide leads with the most economical option that still resists your medium — not a blanket PVDF recommendation. Ratings are for guidance; confirm your exact concentration and temperature with our engineers.
Acids
Sulfuric acid (50%) — fully resistant in UPVC to 40°C; CPVC to 60°C; PPH and FRPP to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Sulfuric acid (98%) — fully resistant in PVDF to 40°C. PVDF is the most economical option here; PVDF is needed only for the hottest or most concentrated duty.
Hydrochloric acid (37%) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 60°C; PVDF to 100°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Nitric acid (30%) — fully resistant in UPVC, PPH, FRPP and CPVC to 40°C; PVDF to 100°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Phosphoric acid (50%) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 60°C; PVDF to 80°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Hydrofluoric acid (40%) — fully resistant in PPH to 60°C; PVDF to 80°C. PPH is the most economical option here; PVDF is needed only for the hottest or most concentrated duty.
Acetic acid (50%) — fully resistant in UPVC and CPVC to 40°C; PPH, FRPP and PVDF to 60°C. UPVC is the lowest-cost choice for ambient service.
Chromic acid (20%) — fully resistant in UPVC and CPVC to 40°C; PVDF to 100°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Formic acid (90%) — fully resistant in UPVC, PPH, FRPP and CPVC to 20°C; PVDF to 80°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Lactic acid (25%) — fully resistant in UPVC to 40°C; CPVC to 60°C; PPH and FRPP to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Alkalis
Sodium hydroxide (50%) — fully resistant in FRPP, CPVC and PVDF to 20°C; UPVC to 40°C; PPH to 80°C. UPVC is the lowest-cost choice for ambient service.
Sodium hydroxide (10%) — fully resistant in CPVC and PVDF to 20°C; UPVC and FRPP to 40°C; PPH to 80°C. UPVC is the lowest-cost choice for ambient service.
Potassium hydroxide (25%) — fully resistant in CPVC and PVDF to 20°C; UPVC and FRPP to 40°C; PPH to 80°C. UPVC is the lowest-cost choice for ambient service.
Ammonia solution (40%) — fully resistant in UPVC to 40°C; PPH, FRPP and PVDF to 60°C. UPVC is the lowest-cost choice for ambient service.
Sodium carbonate — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Salts & oxidizers
Sodium hypochlorite (10%) — fully resistant in UPVC, CPVC and PVDF to 40°C. UPVC is the lowest-cost choice for ambient service.
Ferric chloride (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Ferric sulfate (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Aluminum sulfate (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Copper sulfate (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Sodium chloride (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Calcium chloride (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Zinc chloride — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Nickel sulfate (saturated solution) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 60°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Hydrogen peroxide (35%) — fully resistant in UPVC, PPH, FRPP and CPVC to 20°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Solvents
Acetone (pure liquid) — fully resistant in PPH and FRPP to 40°C. PPH is the most economical option here.
Toluene — fully resistant in PPH and FRPP to 20°C; PVDF to 40°C. PPH is the most economical option here; PVDF is needed only for the hottest or most concentrated duty.
Xylene — fully resistant in PVDF to 100°C. PVDF is the most economical option here; PVDF is needed only for the hottest or most concentrated duty.
Benzene (pure liquid) — fully resistant in PVDF to 20°C. PVDF is the most economical option here; PVDF is needed only for the hottest or most concentrated duty.
Isopropyl alcohol (pure) — no standard thermoplastic (UPVC, PPH, CPVC or PVDF) is rated fully resistant to this medium — ask our engineers about lined or alternative options.
Formaldehyde (35%) — fully resistant in UPVC, CPVC and PVDF to 40°C; PPH and FRPP to 60°C. UPVC is the lowest-cost choice for ambient service.
Gasoline — fully resistant in PVDF to 80°C. PVDF is the most economical option here; PVDF is needed only for the hottest or most concentrated duty.
Gases
Chlorine gas (dry) (pure gas) — fully resistant in UPVC and CPVC to 60°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Chlorine water (400 ppm) — fully resistant in UPVC and CPVC to 20°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Sulfur dioxide (wet) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 60°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Hydrogen sulfide (aqueous) — fully resistant in UPVC to 40°C; PPH, FRPP and CPVC to 80°C; PVDF to 120°C. UPVC is the lowest-cost choice for ambient service; PVDF is needed only for the hottest or most concentrated duty.
Related: PVDF chemical resistance guide UPVC vs CPVC vs PPH vs PVDF selection PVDF valves
Q1｜Which plastic valve material is best for chemicals?
A：It depends on the medium and temperature. UPVC is the most economical and handles many acids, salts and alkalis at ambient temperature; CPVC extends that same chemistry to higher temperatures; PPH resists alkalis and some solvents that attack PVC; and PVDF covers the most aggressive acids, oxidizers and hot service. This tool picks the lowest-cost material rated fully resistant at your exact temperature.
Q2｜Do I always need PVDF for corrosive chemicals?
A：No — and over-specifying PVDF adds cost. For many duties a cheaper material is fully resistant: dilute sulfuric acid, most chloride salts and many alkalis are handled by UPVC or CPVC at ambient temperature. PVDF earns its premium for concentrated or oxidizing acids, halogens and hot service. The selector shows exactly where the step up to PVDF is necessary.
Q3｜What is the difference between UPVC, CPVC, PPH and PVDF chemical resistance?
A：UPVC and CPVC share similar chemical resistance, but CPVC keeps it to a higher temperature; both are weak against ketones, esters and aromatic or chlorinated solvents. PPH resists alkalis and some of those solvents but not strong oxidizers. PVDF has the broadest resistance to acids, oxidizers and solvents and the highest temperature range. Check the grid above for the exact rating by temperature.
Q4｜Is PVC resistant to sulfuric acid?
A：Yes, within limits. UPVC is fully resistant to dilute sulfuric acid (around 10–50%) at ambient temperature, with CPVC and PPH extending the range; at high concentration (80%+) or elevated temperature, PVDF or PTFE is required. Search “sulfuric acid” above to see the rating at each concentration and temperature.
Q5｜Does the valve seat or seal material affect chemical resistance?
A：Yes. A valve’s resistance is set by its weakest wetted part, so the seat and seals matter as much as the body. EPDM suits many acids and alkalis but not oils or hydrocarbons; FKM (Viton) suits oils and many solvents but not strong alkalis; PTFE resists almost everything. The tool shows body and seal materials together so you can match the full assembly.
Q6｜How does temperature affect chemical resistance?
A：Resistance almost always falls as temperature rises, which is why a material can be fully resistant at 20°C but only limited or unsuitable at 60–80°C. That is why temperature, not just the chemical, decides the material. The grid above is rated at 20, 40, 60, 80, 100 and 120°C so you can read the limit for your service.