You are here:

Hypophosphorous Acid (H3PO2) CAS 6303-21-5

Chemical Formula: H3PO2
Molecular Weight: 66.00 g/mol
Boiling Point: 130.5 °C (266.9 °F)
Appearance: Colorless liquid
Purity: 99% minimum

Packaging Details:

Aluminum packages, carton box, wooden box, customized packaging

Delivery Time:

3-5 Days: EMS, Fedex, UPS, DHL, Purolator, Hermes, Estafeta, J&T Express(MX)
7-15 days: DPD, GLS, CANADA POST, HK POST, Royal Mail


Germany, Australia, Russia

Payment Terms:

T/T, Western Union, Cryptocurrency, Money Gram, Alibaba (credit card, paypal), Forum Escrow


Hypophosphorous Acid (H3PO2) Product Introduction

Hypophosphorous Acid is a chemical compound with the CAS (Chemical Abstracts Service) number 6303-21-5. It is also known as phosphinic acid or simply HPA. Its chemical formula is H3PO2, so we also call it h3po2 acid. It is a colorless, odorless, and highly reactive liquid at room temperature. It is typically supplied in aqueous solutions, where it is often found as a clear or slightly yellowish liquid.

Basic Parameter Information:

Product Name:Hypophosphorous acid
CAS NO:6303-21-5
Molecular Formula:H3PO2
Molecular Weight:66 g/mol
Melting point:26.5 °C
Boiling Point:130 °C
Appearance:colorless liquid

Hypophosphorous Acid Applications:

1. Reducing Agent:

It is widely utilized as a powerful reducing agent in various chemical processes. Its ability to rapidly shift metal ions between higher and lower oxidation states makes it particularly advantageous in electroless nickel plating and metal surface treatment applications.

2. Polymer Industry:

HPA is used in the production of polymers and resins as an antioxidant stabilizer, helping prevent oxidation during manufacturing processes and storage.

3. Water Treatment:

Water treatment applications use electrocoagulation to remove trace amounts of heavy metals and metal ions that are harmful or undesirable in drinking water or industrial wastewater supplies.

4. Pharmaceuticals:

Hypophosphorous acid may be utilized as a reducing agent during the synthesis of certain drugs and pharmaceutical intermediates.

Whrchem, as a reputable supplier of chemical and pharmaceutical raw materials, caters to the needs of wholesalers, offering top-quality products, exceptional customer support, and timely delivery.


We currently have warehouses in the USA/Canada/Australia/Russia/Germany which support pick-up or use domestic delivery. We also have another shipping method as below:
UK: UPS/Hermes/Royal Mail
Mexico:Mexico Estafeta /J&T Express(MX)
We will choose the most suitable shipping method according to different destination countries or your requirements.
7-15 days delivery, guarantee buyer 100% receive the goods, if there is any customs problem, we promise to resend it for free.



Powder and solid: Bulk powder is packaged in double-layer aluminium thin bag deodorant packaging, and small goods are packaged in plant extract animal food packaging bags.
Liquids and oils: Liquids are changed to general product names, sealed packaging, with blisters to prevent leakage.
We have standard packaging, and can also be customized according to your requirements.

For more details, please refer to SHIPPING & PACKING


There are no reviews yet.

Be the first to review “Hypophosphorous Acid (H3PO2) CAS 6303-21-5”

Your email address will not be published. Required fields are marked *

Post comment

Categories: , SKU: RC-6303-21-5 Tags:

Get a Free Quote

Don’t hesitate to reach out to us if you have any questions – we’re here to help!