About this product
Phosphoric acid — orthophosphoric acid, H3PO4, CAS 7664-38-2 — is a tribasic mineral acid supplied as a clear, colourless syrupy liquid, with the trade designation "85%" referring to its aqueous H3PO4 concentration. We stock Orthophosphoric Acid, Technical Grade at 86.0% min H3PO4 and 62.3% min P2O5, used across metal surface treatment and phosphating, cleaning and detergent formulations, water treatment, and phosphate salt manufacture. We supply industrial buyers in 50 kg carboys from our Redhills, Chennai warehouse with dispatch across South India, sourcing from Indian producers and imported origins; TDS and MSDS are available on request, and order sizes depend on packaging and current stock.
Phosphoric Acid at a glance
- Also known as
- Orthophosphoric acid
- CAS number
- 7664-38-2
- Formula
- H3PO4
- HSN code
- 2809 20 10
- UN number
- UN 1805
CAS number and formula checked against PubChem on 9 October 2026. Full grade and property values are in the specifications below. More lookups: chemical abbreviations list · CAS number reference.
Applications & Uses
Safety & Technical Documents
MSDS / SDS
Technical data sheet (TDS) & Certificate of Analysis
Batch Certificate of Analysis (CoA) · supplied with every delivery
Need another sheet? Browse the full SDS & TDS library — safety and technical data sheets for every product we stock.
Product DataGrades & Technical Specifications
Grades & Technical Specifications
Physical Properties
- Appearance
- Clear, colourless syrupy liquid
- Assay
- 86.0% min Orthophosphoric Acid (H3PO4); 62.3% min P2O5
- Density
- Specific gravity 1.685 min at 20°C
Supply & Packaging
- Packaging
- 50 kg carboy
- Grades Available
- Orthophosphoric Acid, Technical Grade
- Origin
- Both
Compliance & Storage
- HS Code
- 2809 20 10
- UN Number
- 1805
- Hazard Class
- Class 8 — Corrosive (corrosive to eyes, skin and metals)
- Storage
- Store away from alkalis and reactive metals. Handle in well-ventilated areas. Keep containers closed.
These specs are indicative. Request a Certificate of Analysis (COA) for batch-specific values.
Source Manufacturers
Sourced directly from verified manufacturers for consistent quality and traceability.
Supplied across South IndiaCoimbatoreMaduraiHosurBangaloreHyderabadVisakhapatnamKochi
Frequently Asked Questions
What is phosphoric acid used for in industry?
Phosphoric acid is a tribasic mineral acid used in metal surface treatment and phosphating, rust removal, industrial cleaning and detergent formulations, water treatment, and the manufacture of phosphate salts. The technical grade we stock is intended for these industrial applications.
What is the CAS number, formula and HSN code for phosphoric acid?
Phosphoric acid carries CAS number 7664-38-2 and the chemical formula H3PO4 (orthophosphoric acid). Its HSN code is 2809 20 10.
Is orthophosphoric acid the same as phosphoric acid, and what does OPA stand for?
Yes — orthophosphoric acid, ortho phosphoric acid and phosphoric acid all refer to the same compound, H3PO4. OPA is a common trade abbreviation for orthophosphoric acid.
What grade and specification of 85% phosphoric acid do you stock?
We stock Orthophosphoric Acid, Technical Grade. The published specification is 86.0% min H3PO4, 62.3% min P2O5, specific gravity 1.685 min at 20 °C, and a clear, colourless syrupy liquid appearance. Trace limits include iron as Fe 10.0 ppm max, calcium as Ca 80.0 ppm max, chloride as Cl 20.0 ppm max, sulphate as SO4 300 ppm max, fluoride as F 100 ppm max and heavy metals as Pb 10 ppm max.
Who supplies phosphoric acid in Chennai, and how is it packed?
We have traded industrial chemicals from Chennai since 1997 and hold phosphoric acid at our Redhills warehouse for dispatch across Tamil Nadu and South India, with our office at Periyamet. The referenced consignment is packed in 50 kg carboys; call or WhatsApp +91 86087 80096 for a quote, as order sizes depend on packaging and current stock.
What is the UN number for phosphoric acid and how should it be handled and stored?
Phosphoric acid ships as UN 1805, Class 8, and is corrosive to eyes, skin and metals. Use acid-resistant gloves, goggles and an apron, handle in well-ventilated areas, and store away from alkalis and reactive metals. Our TDS and MSDS PDFs are downloadable from this page.