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

1. 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

2. Chemical Industry

• Intermediate in the production of organophosphonates (e.g. glyphosate, ATMP, EDTMP)

• Utilized in stabilizers for PVC and plasticizers

3. Water Treatment

• Precursor for biodegradable scale and corrosion inhibitors

• Compatible with formulations for RO and cooling systems

4. 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

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.