Hypophosphorous Acid is an inorganic phosphorus-containing acid commonly used as a reducing agent in controlled industrial chemical processes. Also referred to as hypophosphorous acid, phosphinic acid, and H3PO2, this substance functions through electron donation reactions associated with low‑valent phosphorus chemistry, enabling reduction steps in electroless plating reduction systems. Identified under CAS 6303-21-5, it is typically handled as an aqueous solution in industrial environments where reaction control and stability are required. For industrial supply, it is provided with competitive factory pricing, supports customized specifications, and is accompanied by standard documentation including MSDS, TDS, COA, suitable for bulk supply.
Hypophosphorous Acid CAS 6303-21-5
- CAS: 6303-21-5
- Synonyms: Hypophosphorous acid, Phosphinic acid, H3PO2, Hydroxyphosphine oxide
- Einecs: 228-601-5
- Molecular Formula: H3PO2
- Grade: Industrial grade 99%
- Package: 200kg iron drum or 50kg plastic drum packaging
Product Description
Hypophosphoric acid
Chemical formula: H3PO2
Molecular weight: 65.99
CAS accession number: 6303-21-5
EINECS accession number: 228-601-5
Density 1.439 g/cm³
Appearance colorless oily liquid or crystallization easily deliquescence
Hazard symbol: R34
UN Dangerous goods number: UN 3264 8/PG 2
Physical property data
1. Properties: colorless oily liquid or deliquescence crystals, the commodity is 50% aqueous solution.
2. Melting point (°C): 26.5.
3. Boiling point (°C): 130.
4. Relative density (water = 1): 1.439.
5. Saturated vapor (kPa): <2.27 (20°C).
6. Octol/water partition coefficient: -1.720.
7. Solubility: miscible with water [1].
Function and use
1. Strong reducing agent, used to prepare sodium hypophosphite, calcium hypophosphite and other hypophosphate.
2. Used in electroplating bath, pharmaceutical, and general reagent.
3. It is used for the reduction of diazo salts (dediazo group), reducing and erasing halogens on the aromatic ring of polynitro compounds.
FAQ - Technical & Supply Chain
-
Q:
Is Hypophosphorous Acid typically used as an industrial reducing agent rather than for laboratory research only?
A: It is commonly applied as an industrial reducing agent in process chemistry systems, where its role is defined by controlled reaction conditions rather than laboratory-only use.
Documents and Product Support
For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.
- COA for batch-based quality reference
- TDS for key physical and chemical information
- SDS / MSDS for handling, storage, and safety reference
- Packing information for sample, trial, and bulk orders
- Technical communication based on application and specification requirements
Information to Confirm Before Quotation
Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.
- Product name and CAS number
- Application or intended end use
- Required purity, grade, or specification
- Sample quantity, trial order, or bulk demand
- Preferred packing form or net weight
- Destination country or port
- Required documents or compliance expectations
Packaging, Storage, and Handling Notes
Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.
Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.
Sample, Bulk Order and Repeat Supply Support
Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.
For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.
