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Phosphorus Acid – Manufacturer, Supplier & Exporter | DPRJ Universal

Last updated: 4 August 2026

Phosphorus Acid (CAS 13598-36-2) 99% purity crystal - DPRJ Universal

What Is Phosphorus Acid (CAS 13598-36-2)?

Phosphorus Acid H3PO3 is an essential inorganic compound extensively utilized in multi-sector manufacturing. DPRJ Universal is among the leading phosphorus acid manufacturers in india, offering stable high-purity 99.0% minimum materials. We serve international markets as a dedicated wholesale supplier, backed by authentic COA, SDS documentation, and regular supply updates.

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Get the best Phosphorus Acid wholesale rates in India directly from the manufacturing unit. While global market indices vary daily, we ensure the most transparent and competitive factory pricing structure.

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What Are the Technical Specifications of Phosphorus Acid?

  • Chemical Name: Phosphorus Acid (Phosphonic Acid)
  • Purity / Assay: 99.0% (Minimum)
  • CAS No.: 13598-36-2
  • Appearance: White or colorless crystalline solid / crystal flakes
  • Formula: H3PO3
  • Molecular Weight: 81.99 g/mol
  • Packaging: 25 KGS BAG
  • Origin: India

What Is Phosphorus Acid Used For?

  • Raw component for formulating high-efficiency phosphorus acid for plants and specialized agricultural fertilizer derivatives.
  • Acts as a vital raw material intermediate for synthesising phosphite salts (such as potassium phosphite) utilized in crop protection fungicides.
  • Employed as a strong reducing agent in industrial chemical operations and intermediate syntheses.
  • Utilized in municipal water treatment operations and the formulation of PVC heat stabilizers.

SKU: PA001

MPN: PHOSPHORUS-ACID-DPRJ-001

Category: Chemicals → Inorganic Acids → Phosphorus Compounds → Phosphorus Acid

Brand: DPRJ Universal

Price Range (Bulk)

₹120 - ₹150 per kg
Price valid until: 31 Dec 2027

Availability: In Stock for Bulk Orders

Customer Rating

⭐ 4.8 / 5

Based on 2,103 verified industrial buyers

“The premium grade phosphorus acid crystal delivered by DPRJ gives exceptionally high yields in our agricultural phosphite liquid production batches. Easily the most reliable supplier in the region.”

— Verified Industrial Buyer, Agrochemical Plant

Shipping & Delivery

Destination: India

Shipping Cost: Free (Bulk Orders)

Handling Time: 1–2 Days

Transit Time: 2–5 Days

Return Policy

Return Window: 7 Days (for non-compliant quality)

Return Method: Return By Mail/Pickup

Return Fees: Free Return (on verified quality issue)

Frequently Asked Questions

What is the primary use of Phosphorus Acid?

The primary industrial use of Phosphorus Acid is as an intermediate in producing specialized agrochemicals and systemic phosphite fertilizers. It is also applied heavily in water treatment facilities, as an engineering plastic PVC stabilizer, and as an effective reducing chemical agent.

What is the molecular weight and chemical formula of Phosphorus Acid?

The chemical formula for Phosphorus Acid is H3PO3. Its exact molecular weight is approximately 81.99 g/mol.

How is Phosphorus Acid used in fertilizer or for plants?

When engineering phosphorus acid for plants, it is neutralized to formulate soluble phosphites. These phosphite fertilizers stimulate rapid immune defenses in crops, aid robust root development, and provide specific systemic resistance against oomycete plant pathogens.

What is the Phosphorus Acid structure and is it dibasic or tribasic?

When analyzing if phosphorus acid is dibasic or tribasic, the molecular structure reveals it is strictly dibasic. While three hydrogen atoms are present in the formula, only two can ionize because they are bonded to oxygen atoms. The final hydrogen remains bonded directly to the central phosphorus atom and cannot dissociate.

Is Phosphorus Acid a strong or weak acid and what is its pH?

Regarding whether phosphorus acid is strong or weak, it is classified as a weak mineral acid. Nonetheless, it remains relatively strong for an inorganic weak acid with a low phosphorus acid ph curve, possessing an initial dissociation constant pKa of 1.3.

What is the CAS number and physical appearance of Phosphorus Acid?

The official phosphorus acid cas no is 13598-36-2. Structurally and visually, it commands high purity trades as a white, hygroscopic phosphorus acid crystal or crystalline flake array.

Is Phosphorus Acid hazardous and what are the handling precautions?

Yes, Phosphorus Acid is a hazardous, highly corrosive chemical that prompts critical skin burns and ocular damage. Secure material processing necessitates strict adherence to workplace PPE mandates (corrosive-resistant gloves, shields, and adequate ventilation enclosures).

Is Phosphorus Acid soluble in water?

Yes, Phosphorus Acid is highly soluble in water.

What is the difference between Phosphorus Acid and Phosphoric Acid?

Phosphorus Acid (H3PO3) is a reducing agent used mainly in agrochemicals and fungicides, whereas Phosphoric Acid (H3PO4) is a fully oxidized acid used broadly in fertilizers and food processing.

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Primary Usage Agrochemical Production (Systemic Phosphites), Fertilizer manufacturing, Water Clarification, Vinyl Polymer Stabilizers, & Specialized Synthesis.
Packaging 25 KGS BAG
HSN Code 28112990