Phosphorous Acid (H₃PO₃)
High-Purity Phosphorous Acid Raw Material for Phosphite Fertilizer Production
Phosphorous Acid (H₃PO₃) is a key raw material used for manufacturing phosphite-based fertilizers and specialty crop nutrition products.
As the primary building block for potassium phosphite formulations, phosphorous acid provides fertilizer manufacturers with a flexible ingredient for developing liquid phosphite fertilizers, foliar nutrition products, and customized crop nutrition solutions.
Unlike traditional phosphate fertilizers based on phosphoric acid (H₃PO₄), phosphorous acid contains phosphorus in a different oxidation state and is widely used in the production of phosphite compounds.
TerraNutrix supplies high-quality phosphorous acid for fertilizer manufacturers, specialty fertilizer companies, and OEM formulation partners.
Key Benefits
High Reactivity for Phosphite Production
Phosphorous acid is an essential starting material for producing potassium phosphite compounds, including: Monopotassium Phosphite (KH₂PO₃) Dipotassium Phosphite (K₂HPO₃) Liquid Potassium Phosphite Solutions
Excellent Solubility
Due to its strong water solubility, phosphorous acid is suitable for manufacturing: Liquid fertilizers Foliar nutrition products Fertigation solutions
Reliable Raw Material for Fertilizer Manufacturers
Phosphorous acid provides manufacturers with: Consistent chemical performance Flexible formulation options Stable supply for large-scale production
Product Specification
| Item | Specification |
|---|---|
| Product Name | Phosphorous Acid |
| Chemical Formula | H₃PO₃ |
| Molecular Weight | 81.99 |
| CAS No. | 13598-36-2 |
| Appearance | White crystalline powder / crystal |
| Application | Phosphite fertilizer production |
| Test Item | Top Grade-1 | Top Grade-2 | First Grade I | First Grade III |
|---|---|---|---|---|
| Main Content (H₃PO₃) |
99.0% Min. | 99.0% Min. | 98.5% Min. | 98.5% Min. |
| Iron (Fe) | 5 ppm Max. | 10 ppm Max. | 20 ppm Max. | 50 ppm Max. |
| Chloride (Cl) | 0.0008% Max. | 0.001% Max. | 0.002% Max. | 0.02% Max. |
| Sulfate (SO₄) | 0.0008% Max. | 0.006% Max. | 0.008% Max. | 0.01% Max. |
| Phosphate (PO₄) | 0.05% Max. | 0.1% Max. | 0.2% Max. | 0.6% Max. |
| Appearance | Pure White Crystal | Pure White Crystal | Pure White Crystal | Pure White Crystal |
| 70% Aqueous Solution Test | Colorless Transparent | Colorless Transparent | — | — |
| Liquid POA | 70–80% Min. | 70–80% Min. | — | — |
Applications
1. Potassium Phosphite Production
Phosphorous acid is widely used as the primary phosphorus source for producing potassium phosphite fertilizers. Typical products include: Monopotassium Phosphite KH₂PO₃ and Dipotassium Phosphite K₂HPO₃
2. Liquid Fertilizer Manufacturing
Phosphorous acid is commonly used by liquid fertilizer manufacturers to produce: Potassium phosphite concentrates Specialty phosphorus nutrition products Customized liquid formulations
3. Specialty Crop Nutrition Products
Phosphite-based fertilizers are commonly incorporated into modern crop nutrition programs for: Field crops Horticultural crops Fruit and vegetable production Greenhouse crops
Why Choose TerraNutrix Phosphorous Acid?
Ingredient Supply for Fertilizer Manufacturers
TerraNutrix provides phosphorous acid and related phosphite ingredients for companies developing: Liquid fertilizers, Specialty fertilizers, OEM crop nutrition products
Technical Documentation Support
Available documents include:Technical Data Sheet (TDS), Certificate of Analysis (COA), Safety Data Sheet (SDS)
Customized Ingredient Solutions
We support customers with:Bulk ingredient supply, Customized packaging, OEM formulation cooperation
Looking for Reliable Phosphorous Acid?
Whether you are developing fertilizer products, feed additives, specialty formulations, or customized OEM solutions, TerraNutrix provides flexible iron ingredient options supported by reliable manufacturing and technical expertise.
Contact our team to discuss your sourcing requirements.