Sodium hypophosphate is a white crystalline powder, soluble in hot ethanol and glycerin, soluble in water, insoluble in ether, mainly used as a preservative and antioxidant in the food industry.
| Items | Specification | Results |
| Batch no. | / | 659241008 |
| Quantity | / | 5000KGS |
| NaH2 PO2. H20 | 101.0%MIN | 102.7% |
| Na2 HPO3 | 0.2%MAX | 0.1% |
| Calcium(Ca) | 30ppm MAX | 9PPM |
| Iron(Fe) | 1.0ppm MAX | 0.1PPM |
| Sulfate(SO4 ) | 30ppm MAX | 8PPM |
| Chloride(Cl) | 30ppm MAX | 8PPM |
| Pb | 0.5ppm MAX | 0.1PPM |
| As | 1.0ppm MAX | 0.5PPM |
| Cd | 1.0ppm MAX | 0.1PPM |
| Cr | 1.0ppm MAX | 0.1PPM |
| PH | 6.0-8.0 | 7.1 |
Applications
The hypophosphite anion’s strong reducing power enables targeted applications in surface treatment and material science:
- Electroless Nickel Plating: Core component in EN baths, reducing nickel ions to deposit amorphous Ni-P alloys (5-15% P) on substrates like steel and ABS plastics, providing wear-resistant finishes for tools, valves, and circuit boards.
- Chemical Synthesis: Selective reducing agent for converting nitroarenes to anilines and aldehydes to alcohols, boosting yields in pharmaceutical intermediates and fine chemicals.
- Polymer Additives: Functions as a stabilizer and antioxidant in polypropylene and polyethylene, preventing oxidative degradation during high-temperature processing.
- Water Treatment: Acts as a deoxygenator in boiler systems, removing dissolved oxygen to inhibit corrosion and extend pipeline integrity.
- Flame Retardants: Incorporated into intumescent coatings and textiles, forming protective char layers upon exposure to fire for enhanced safety.
- Catalysts and Electrochemistry: Enhances hydrogen evolution reactions in fuel cells and supports silver mirror tests in analytical chemistry.
With growing adoption in renewable energy components, annual global consumption approaches 60,000 tons, underscoring its role in precision engineering.
Why Choose Aozun Chem’s Sodium Hypophosphite?
- Top-Tier Purity: Compliant with ASTM B733 and REACH, featuring <50 ppm heavy metals to minimize bath contamination and maximize plating uniformity.
- Value Optimization: Bulk sourcing at competitive rates, with consistent quality to reduce downtime and rework costs.
- Seamless Global Supply: Direct shipping to Asia, Europe, and the Americas, with flexible MOQs starting at 1 MT.
- Dedicated Technical Aid: Expert advice on bath formulation, pH optimization, and troubleshooting for peak deposition rates.
- Green Chemistry Focus: Supports closed-loop phosphorus recycling, lowering environmental impact and aligning with EU ELV directives.
Elevate your plating and synthesis with Aozun Chem’s sodium hypophosphite—engineered for excellence and efficiency.
Frequently Asked Questions (FAQs)
What is sodium hypophosphite, and why is it preferred for electroless plating?
Sodium hypophosphite (NaH₂PO₂) is a water-soluble reducing salt that supplies hydride ions for metal ion reduction without external power. It’s preferred in electroless nickel plating for its ability to co-deposit phosphorus, yielding hard (Rc 50-60), corrosion-resistant layers that outperform electrolytic methods on complex geometries.
How is it manufactured?
It is primarily produced by reacting yellow phosphorus with sodium hydroxide under controlled heating, followed by filtration and crystallization. Alternative routes involve ion-exchange of hypophosphorous acid, achieving purities over 99% with minimal hypophosphoric acid byproducts.
What are the key safety considerations for sodium hypophosphite?
This compound is a mild irritant to skin and eyes but highly flammable when dry (autoignition at 100°C); avoid oxidizers and open flames. Use PPE, store in inert atmospheres, and neutralize spills with sodium bicarbonate. Acute oral toxicity is low (LD50 >2,000 mg/kg in rats), but inhalation of dust requires ventilation.
Is sodium hypophosphite compatible with food or pharmaceutical processing?
Purified grades (≥99.5%) meet USP-NF and FCC standards for use as a reducing agent in pharma APIs and as a dough conditioner in baking, provided residuals are below 0.1%. It’s not for direct ingestion but supports indirect applications like equipment sterilization.
What is the typical shelf life and storage method for sodium hypophosphite?
It stays potent for 18-24 months in sealed, moisture-proof containers at <25°C and <60% RH to prevent hydration or oxidation. Keep away from metals to avoid hydrogen generation; refrigerated storage extends usability for sensitive formulations.
Can sodium hypophosphite support sustainable manufacturing practices?
Yes, it enables solvent-free plating processes that cut energy use by 30% versus electroplating and facilitates phosphorus recovery from spent baths, reducing mining dependency. It’s integral to halogen-free flame retardants, promoting safer, recyclable plastics.
How does sodium hypophosphite differ from sodium borohydride in reducing applications?
Sodium hypophosphite operates in acidic conditions (pH 4-5) for controlled, phosphorus-alloyed depositions, ideal for industrial plating, while sodium borohydride suits alkaline reductions (pH >10) for organic synthesis but is more reactive and costly. Hypophosphite offers better bath stability for continuous operations.
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