corrosiveH₃PO₄CAS 7664-38-2
Valves for Phosphoric Acid (H₃PO₄) Service
Phosphoric acid is a moderate acid used in fertiliser production (wet process phosphoric acid), food processing, metal surface treatment, and semiconductor manufacturing. Wet process P₂O₅ contains fluoride and sulfate impurities that dramatically increase corrosivity over pure acid.
Pressure Range
1–16 bar
Temperature
Ambient to 100°C
Industries
Fertiliser (DAP, MAP, SSP), Food additives (cola, baking powder), Metal surface treatment (pickling)
What valves are used for Phosphoric Acid (H₃PO₄) service?
Hastelloy C-276 ball valve are recommended for Phosphoric Acid (H₃PO₄) service: Wet process phosphoric acid with fluoride/sulfate impurities.
Key Properties - Phosphoric Acid (H₃PO₄)
- Wet process phosphoric acid contains HF and H₂SO₄ impurities - far more corrosive
- Pure food-grade phosphoric acid is relatively mild
- SS 316L acceptable for food-grade and clean phosphoric acid
- Fluoride content in wet process acid attacks many metals and PTFE at elevated temperature
- Rubber lining is a primary defence for wet process acid
Vajra Industrial Solutions manufactures and supplies valves for Phosphoric Acid (H₃PO₄) service — including hastelloy c-276 ball valve — in corrosion-appropriate materials selected for the operating conditions described here, with full material and test documentation.
Need valves for Phosphoric Acid (H₃PO₄) service?
Send your fluid conditions — we'll recommend the right valve, material and standard, with a 24-hour quote.
Material Compatibility - Phosphoric Acid (H₃PO₄)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| Carbon Steel | Poor | High corrosion rate in most phosphoric acid concentrations. |
| SS 316L | Good | Food-grade or pure H₃PO₄ up to 85% at ambient. Not for wet process acid with fluoride. |
| Hastelloy C-276 | Excellent | Best choice for wet process phosphoric acid with fluoride impurities. |
| Rubber-lined (natural rubber) | Good | Excellent for wet process acid - industry standard for large bore piping. |
| FRP / PVDF-lined | Good | PVDF good for clean phosphoric acid service. |
| PTFE-lined | Good | Excellent for clean phosphoric acid. Caution with fluoride-bearing wet process acid at elevated temperature. |
Recommended Valves
Hastelloy C-276 ball valve
Wet process phosphoric acid with fluoride/sulfate impurities
Full selection guideRubber-lined butterfly valve
Large bore wet process acid service - industry standard
Full selection guidePTFE-lined diaphragm valve
Clean phosphoric acid in pharmaceutical and food processing
Full selection guideValves to Avoid
Carbon steel valves (high corrosion rate)
Copper alloys
Standard SS 304 in concentrated acid
Special Considerations
Applicable Standards
Shop Valves for Phosphoric Acid (H₃PO₄) Service
Other Fluid Services
Phosphoric Acid (H₃PO₄) Service — Procurement & Specification
Typical Applications
Available Standards
Material Options
Documentation Available
- -EN 10204 3.1 Material Test Certificates (heat traceable)
- -API 598 hydrostatic shell & seat test reports
- -Dimensional inspection reports
- -Full Manufacturing Data Record (MDR) / data book on request
Inspection Options
- -In-house QC inspection on every order
- -Third-party inspection (SGS / Bureau Veritas / TÜV / DNV) coordination
- -Witness and hold points accommodated on request
Order Quantities
Flexible — from single critical-spare valves to full project lots.
Export
Worldwide export with complete documentation (COO, EUR.1, packing lists) to 20+ countries.
Custom Engineering
Built to your specification — materials, trim, pressure class and special service (NACE, fire-safe, IBR, cryogenic).
Delivery Support
Dispatch from Vadodara, Gujarat with documented lead times and priority handling for urgent requirements.
Engineering references
Connected Engineering
Need Valves for Phosphoric Acid (H₃PO₄) Service?
Tell us your fluid, pressure, and temperature — we'll recommend the right valve, material, and standard, with a 24-hour quote.