O3Sb2
291.52 g/mol
Industrial ChemicalWarning
Diantimony trioxide
CAS1309-64-4EC215-175-0
Category
Industrial Chemical
Compound Class
Inorganic Salt
Primary Use
flame retardant for textiles and plastics
Diantimony trioxide is an inorganic compound with the formula Sb2O3, known as the most commercially significant compound of antimony. It occurs naturally as the minerals valentinite and senarmontite and is primarily used as a flame retardant for textiles and plastics.
flame retardant for textilesflame retardant for plastics
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.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 1309-64-4
Related Compounds
ReferenceSame Category
Bromoacetic anhydride
CAS13094-51-4
Chemical intermediate for synthesis
ReferenceSame Category
Dimethyl phthalate
CAS131-11-3
Plasticizer and solvent for plastics
ReferenceSame Category
Diallyl phthalate
CAS131-17-9
Plasticizer and monomer for thermosetting plastics
ReferenceSame Category
Benzophenone-6
CAS131-54-4
ultraviolet light absorber
Safety Reference
Warning
H351Suspected of causing cancer
H373May cause damage to organs through prolonged or repeated exposure
H350May cause cancer
H401Toxic to aquatic life
H411Toxic to aquatic life with long lasting effects
H302Harmful if swallowed
H371May cause damage to organs
H372Causes damage to organs through prolonged or repeated exposure
H303May be harmful if swallowed
H320Causes eye irritation
H360May damage fertility or the unborn child
H370Causes damage to organs
H402Harmful to aquatic life
H412Harmful to aquatic life with long lasting effects
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for Diantimony trioxide (CAS 1309-64-4) is 2825.80.
HS code (international, 6-digit)
2825.80
EU CN code (8-digit)
2825 80 00
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
bis(antimony(3+));tris(oxygen(2-))
InChIKey
GHPGOEFPKIHBNM-UHFFFAOYSA-N
SMILES
[O-2].[O-2].[O-2].[Sb+3].[Sb+3]
Synonyms (64)
- LS-FR
- A 1582
- A 1588LP
- AN 800
- ANTIMONIUM OXYDATUM
- ANTIMONY TRIOXIDE
- AP 50
- AP 50 (metal oxide)
- AT 3 (fireproofing agent)
- AT 3B
- Amspec-KR
- Antimonious oxide
- Antimony Bloom 100A
- Antimony Bloom 500A
- Antimony White
- Antimony oxide (SB203)
- Antimony oxide (Sb2O3)
- Antimony sesquioxide
- Antimony(3+) oxide
- Antox
- Atox B
- Atox F
- Atox R
- Atox S
- CI 77052
- Chemetron fire shield
- Dechlorane A-O
- Diantimony trioxide
- Exitelite
- FireShield LS-FR
- Fireshield FSPO 405
- Fireshield H
- Flame Cut 610
- Flame Cut 610R
- Flameguard VF 59
- HM 203P
- LSB 80
- MIC 3
- Microfine A 05
- Nyacol A 1510LP
- Nyacol A 1530
- Octoguard FR 10
- Patox C
- Patox H
- Patox L
- Patox M
- Patox S
- Sb2O3,
- Senarmontite
- Stibiox MS
- Thermoguard B
- Thermoguard L
- Thermoguard S
- Timonox
- Timonox White Star
- Twinkling star
- Valentinite
- Weisspiessglanz
- Weisspiessglanz [German]
- White star
- antimony(3+);oxygen(2-)
- oxostibanyl stibinate
- oxygen(-2) anion
- trioxoantimony