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Phosphorous Acid (H₃PO₃) – Premium Quality from China Supplier
Phosphorous acid, also known as H₃PO₃, is a white crystalline chemical compound with a wide range of applications in agriculture, industry, and chemical manufacturing. As a leading phosphorous acid supplier in China, we offer high-purity products that meet international standards and are available with REACH certification for export to Europe and other regulated markets.
Product Overview
Phosphorous acid is primarily used as a reducing agent, intermediate in chemical synthesis, and as a source of phosphite ions. Its molecular formula is H₃PO₃ and it is often confused with phosphoric acid (H₃PO₄), though their chemical behaviors and uses are significantly different.
Key Applications of Phosphorous Acid
Agriculture
Used to manufacture phosphite-based fungicides and plant nutrition products
Helps boost plant resistance against pathogens
Acts as a source of systemic phosphorus in crops
Chemical Industry
Intermediate in the production of organophosphonates (e.g. glyphosate, ATMP, EDTMP)
Utilized in stabilizers for PVC and plasticizers
Water Treatment
Precursor for biodegradable scale and corrosion inhibitors
Compatible with formulations for RO and cooling systems
Pharmaceutical Intermediates
Used in specialty organic synthesis processes and active pharmaceutical ingredients (API) production
Benefits of Our Phosphorous Acid
High Purity (≥99%)
Low Chloride & Heavy Metal Content
Available in 25kg bags or 1MT jumbo bags
Complies with REACH, ISO9001, and SGS-certified
Stable supply chain, large-volume support, OEM available
Typical Specification
| Parameter | Specification |
|---|---|
| Assay (H₃PO₃) | ≥ 99.0% |
| Chloride (Cl⁻) | ≤ 0.01% |
| Sulfate (SO₄²⁻) | ≤ 0.01% |
| Heavy Metals (Pb) | ≤ 10 ppm |
| Iron (Fe) | ≤ 5 ppm |
| Appearance | White Crystalline Powder |
Packaging & Shipping
Standard: 25kg net plastic woven bags
Custom packaging available
Dangerous goods classification: Non-DG
Export-ready with full documentation support
Why Choose Us?
10+ years in chemical export business
Customers in over 60 countries
Dedicated REACH dossier and professional logistics support
Technical documentation & COA available on request
If you’re looking for a trusted phosphorous acid supplier from China, contact us today for a free sample and competitive quotation.