Sodium Hypo Phosphite CAS No.10039-56-2

Certificate of Analysis

Specification Results
Batch No. / 1152502181B
NaH2PO2.H2O ≥101.0% 103.2%
Na2HPO3 ≤0.2% 0.08%
Ca ≤20ppm 14ppm
Fe ≤2ppm 0.7ppm
Sulphate ≤20ppm 9ppm
Chloride ≤30ppm 13ppm
PH 6.0-8.0 6.6
Heavy metal (Pb) ≤2ppm ≤2ppm
As ≤1ppm ≤1ppm
Cd ≤1ppm ≤1ppm
Appearance White,Free flowing fine crystals White,Free flowing fine crystals

Applications-Sodium Hypo Phosphite 

Electroless Plating

  • Nickel-Phosphorus Coatings: Added at 25-35 g/L to baths for corrosion-resistant layers on automotive parts and electronics, providing uniform 5-20 µm deposits.
  • Surface Activation: 5-10 g/L in palladium baths to enhance adhesion on non-conductive substrates like plastics.

Polymer and Flame Retardants

  • Nylon Stabilization: Incorporated at 0.5-2% to prevent yellowing and improve processability in polyamide fibers.
  • Intumescent Additives: 3-8% in epoxy resins for char-forming flame retardancy in cables and composites.

Pharmaceutical and Fine Chemicals

  • Reducing Agent: Used in peptide synthesis for disulfide reduction at 1-3 equivalents, ensuring selective deprotection.

Why Choose Our SHP?

Our Sodium Hypophosphite is crystallized from high-grade phosphorous sources with phosphite <0.1% and heavy metals <5 ppm, guaranteeing bright, adherent platings and stable polymers without defects. Platers achieve 20% higher bath life and 15% better phosphorus uniformity. Available in monohydrate powder and 50% solution for technical/pharma grades, packaged in 25kg bags or 250kg drums, with Kosher, Halal, and USP certifications for global compliance.

Frequently Asked Questions (FAQs)

What is Sodium Hypophosphite (SHP)?

Sodium Hypophosphite (SHP) is a phosphorus salt with formula NaH₂PO₂·H₂O and CAS 10039-56-2, used as a reducing agent. It’s a white powder that donates electrons for plating and stabilization in polymers.

How is SHP used in electroless nickel plating?

Add 30-40 g/L to the bath at pH 4.5-5.5 and 85-90°C; it reduces Ni²⁺ while co-depositing phosphorus for wear-resistant coatings.

Is SHP safe for industrial handling?

Yes, with ventilation—it’s non-flammable and low toxicity (LD50 >5000 mg/kg oral), but avoid skin contact and store away from oxidizers.

What is the shelf life of SHP?

In sealed, dry conditions below 30°C, it retains >98% activity for 18-24 months, resistant to oxidation.

Can SHP be combined with other reducers?

SHP synergizes with hypophosphorous acid at 1:1 ratios for faster reductions but incompatible with strong bases; test for bath stability.

Does SHP affect solution pH?

Its neutral pH (6.5-7.5) has minimal impact, but reactions may slightly acidify—adjust with ammonia for plating baths.

What packaging options are available for SHP?

We offer 25kg multi-wall bags, 50kg drums, and 1000kg supersacks, all moisture-proof for safe transport.

For plating recipes, purity specs, or custom forms, our technical team provides expert support.

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