Hypophosphorous Acid (HPA), CAS 6303-21-5, is a phosphorus oxyacid and reducing agent used in electroless nickel plating and chemical reduction processes. For procurement review, confirm the offered concentration and impurity limits, packaging suitable for the offered concentration, and applicable safety documentation.
Hypophosphorous Acid (HPA) CAS 6303-21-5
- CAS: 6303-21-5
- Synonyms: Hypophosphorous acid; Phosphinic acid; HPA; H₃PO₂
- Einecs: 228-601-5
- Molecular Formula: H₃PO₂
- Grade: Confirm offered concentration and impurity limits
- Package: Confirm packaging for the offered concentration
Product Description
Identity boundary: Hypophosphorous acid, also called phosphinic acid, is H₃PO₂ under CAS 6303-21-5. It is not hypophosphoric acid; RFQs must use the correct chemical name and CAS.
Procurement review: Confirm the offered concentration and impurity limits, packaging suitable for the offered concentration, and applicable safety documentation for the actual offered material.
FAQ - Technical & Supply Chain
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Q:
Are Hypophosphorous Acid and Phosphinic Acid the same material?
A: Yes. Both names identify H₃PO₂, CAS 6303-21-5. It is not phosphorous acid, H₃PO₃, or phosphoric acid, H₃PO₄. The commercial product is generally supplied as an aqueous solution, so the contract must state both the chemical identity and concentration rather than treating the CAS number as a complete grade description. -
Q:
Which specifications should be agreed for Hypophosphorous Acid solution?
A: Define H₃PO₂ concentration and test method, phosphorous and phosphoric acid limits, chloride, sulfate, relevant metals, color and density. State whether results are reported as acid, hypophosphite or another calculation basis. Compare the batch COA with the agreed concentration because 30–32% and 50% solutions are different commercial forms, not interchangeable grades. -
Q:
What should be confirmed before importing or receiving bulk HPA?
A: Confirm solution concentration, package or tanker material, valve and gasket compatibility, previous-cargo and cleanliness records, net quantity, seals and current SDS. Also check destination-country documentation and any precursor-control requirements before shipment. Receiving equipment should prevent contamination and uncontrolled contact with incompatible oxidizing agents, bases or heat sources.
Ordering & Documentation
Key information for document requests, quotations, and supply planning.
Documents
COA, TDS, SDS/MSDS and packing details are available on request.
Quotation
Send the CAS number, grade, quantity, packing preference and destination.
Sample & Supply
Support is available for samples, trial orders, bulk and repeat supply.
Storage & Shipping
Product-specific conditions are confirmed before order.
