H3O3P
81.996 g/mol
Industrial ChemicalDanger
Phosphorous acid
CAS10294-56-1EC233-663-1
Category
Industrial Chemical
Compound Class
Organic Acid
Primary Use
Lubricating and anti-scaling agent
Phosphorous acid is a phosphorus-containing oxoacid and serves as a conjugate acid of dihydrogenphosphite. It is commonly used in industrial applications as a lubricating and anti-scaling agent.
Lubricating agentAnti-scaling agentStabilizing agent
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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Chemical intermediate for synthesis
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ReferenceSame Category
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Plasticizer for vinyl plastics
Safety Reference
Danger
H302Harmful if swallowed
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for Phosphorous acid (CAS 10294-56-1) is 2811.19.
HS code (international, 6-digit)
2811.19
EU CN code (8-digit)
2811 19 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
phosphorous acid
InChIKey
OJMIONKXNSYLSR-UHFFFAOYSA-N
SMILES
OP(O)O
Synonyms (12)
- Pamidronate EP Impurity C
- Caswell No. 663I
- Dihydroxyphosphine oxide
- Orthophosphorous acid
- Orthophosphorus acid
- Phophorous acid
- Phosphorane, trihydroxy-
- Phosphorous acid
- Trihydroxyphosphine
- trioxidophosphate
- trioxophosphate
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