Hypophosphorous Acid (HPA)

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Hypophosphorous Acid General Information

Chemical Name: Hypophosphorous Acid
Synonyms: Hypophosphorous Acid, Phosphine oxide, Phosphinic acid
Chemical Formula: H3PO2
CAS Number: 6303-21-5
EC Number: 228-601-5

Hypophosphorous Acid Uses

Bleaching Agent – Hypophosphorous Acid is used as a bleaching or decolorizing agent for plastics, synthetic fibers, and chemicals

Color Stabilizer – HPA is used as a decolorizing agent and for color stabilization during the manufacture of chemicals and several plastics including: nylon fibers, polyamides, polyester fiber, polyacrilonitrile, alkyd rsins, epoxies, fatty acid esters, and glycerols.

Hypophosphite Salts – Hypophosphorous Acid is used in the production of Hypophosphite Salts (i.e., Calcium, Magnesium, Manganese, Potassium, Iron, and Ammonium) which are in turn used in synthetic fibers as wetting dispersing, emulsifying, and anti-static agents

Chemical Intermediate – Used in organic synthesis and organo phosphinic acid production

Neturalizing Agent – Used as a moderately strong monobasic acid

Catalyst – Used as a polymerization and polycondensation catalyst

Wetting Agent – Used as a wetting, dispersing, or emulsifying agent in electroplating

Reducing Agent – May be used for its strong but slow reducing action

Antioxidant – Hypophosphorous Acid may be used as an antioxidant

Pharmaceutical – HPA may be used as a stimulant in pharmaceuticals

Hypophosphorous Acid Certificate of Analysis (COA)

Product Name: Hypophosphorous Acid, 50%

Quality: SMC Spec.605

Batch 20101223/11288

Test/Property Specification Result
Appearance Clear, white solution Clear, white solution
Assay (H3PO2) 50.00 TO 52.00 % 50.38 %
Chloride (Cl), ppm 150 ppm MAXIMUM 20
Color, (APHA) Less than 30 APHA Less than 30 APHA
Iron (Fe), ppm 10 ppm MAXIMUM 2
Orthophosphite, % 0.500 % MAXIMUM 0.400
Specific Gravity @ 25 deg C 1.210 TO 1.265 G/CC 1.210


Approval Date:  8/2/2011

Spec Revision

Hypophosphorous Acid Material Safety Data Sheet (MSDS)