Molekula
Hypophosphorous acid, 50% aq. soln.
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Hypophosphorous acid, 50% aqueous solution, is a strong reducing agent used in electroless nickel plating, chemical synthesis, and as a stabilizer in polymerization reactions. It is a clear, colorless to pale yellow liquid with a pungent odor. CAS: 6303-21-5, molecular formula: H3O2P, molecular weight: 66.0 g/mol. Store at ambient temperature. Hazardous: signal word Danger. Molekula supplies Hypophosphorous acid, 50% aq. soln. from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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500 mL — £77.70 per pack ex VAT · £93.24 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Colourless liquid |
| Density | 1.21 - 1.26 |
| Colour (Pt-Co) | ≤ 20 |
| Heavy metals | ≤ 0.0002% |
| Identification | Conforms to reference |
| Chloride (Cl-) | ≤ 0.015% |
| Assay | ≥ 50.0% |
| Iron (Fe) | ≤ 0.0015% |
| Arsenic (As) | ≤ 0.0001% |
| Sodium (Na) | ≤ 0.10% |
| Sulphates (SO4)(2-) | ≤ 0.015% |
| H3PO3 | ≤ 0.3% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 18774297 |
| CAS Number | 6303-21-5 |
| IUPAC Name | phosphinic acid |
| Molecular Formula | H3O2P |
| Molecular Weight | 66.0 |
| Exact Mass | 65.9871 |
| SMILES | O[PH2]=O |
| InChIKey | ACVYVLVWPXVTIT-UHFFFAOYSA-N |
| InChI | InChI=1S/H3O2P/c1-3-2/h3H2,(H,1,2) |
| PubChem CID | 4124402 |
| UN Number | UN3264 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2811.19.6190 |
| Tariff Code | 2811198090 |
Safety & GHS
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Corrosive
GHS05
Hazard statements
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acid, Phosphinic
- Hydroxyphosphine oxide
- Hypophosphorus acid
- Phosphine oxide, hydroxy-
- Phosphinic Acid
Frequently asked questions
What is hypophosphorous acid, 50% aq. soln. used for?
It is primarily used as a reducing agent in chemical synthesis, electroless nickel plating, and as a stabilizer in polymerization reactions.
What is the chemical formula and molecular weight of hypophosphorous acid, 50% aq. soln.?
The formula is H3O2P and the molecular weight is 66.0 g/mol.
How should hypophosphorous acid, 50% aq. soln. be stored?
It should be stored at ambient temperature, away from incompatible materials and strong oxidizing agents.
What grade of hypophosphorous acid, 50% aq. soln. is available?
We supply it as a 50% aqueous solution, suitable for industrial and laboratory use.
Can Molekula supply hypophosphorous acid, 50% aq. soln. in bulk?
Yes, we can supply bulk quantities—please contact our sales team for pricing and delivery options.
What documentation comes with an order of hypophosphorous acid, 50% aq. soln.?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.