Antimony trioxide

Description

Antimony trioxide is identified by CAS 1309-64-4, molecular formula Sb2O3 and molecular weight 289.79 g/mol. UNII P217481X5E; ChEBI 82289; InChIKey GHPGOEFPKIHBNM-UHFFFAOYSA-N. Boiling Point: 1425 °C; Boiling Point: 1425 °C @760 [mm Hg]; Melting Point: 1211 °F (NTP, 1992).

Identification

CAS Registry Number	1309-64-4
PubChem CID	14794
Molecular formula	Sb2O3
Molecular weight	289.79 g/mol
IUPAC name	bis(antimony(3+));tris(oxygen(2-))
InChIKey	GHPGOEFPKIHBNM-UHFFFAOYSA-N
UNII (FDA)	P217481X5E
ChEBI ID	CHEBI:82289

Computed Descriptors

Molecular Weight	291.52
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	0
Exact Mass	291.79277
Monoisotopic Mass	289.79237
Topological Polar Surface Area	3
Heavy Atom Count	5
Formal Charge	0
Complexity	0

Physical & Chemical Properties

Boiling Point	1425 °C
Boiling Point	1425 °C @760 [mm Hg]
Melting Point	1211 °F (NTP, 1992)
Melting Point	655 °C
Melting Point	656 °C
Density	Density (at 24 °C): 5.9 g/cm³
Density	5.58 @25 °C
Vapor Pressure	1 mmHg at 1065 °F (NTP, 1992)
Vapor Pressure	1 mm Hg at 574 °C
Other Experimental Properties	MP: 650 °C; BP: 1550 °C (sublimes)

Physical description & handling notes

• Antimony trioxide is a white crystalline solid. It is insoluble in water. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used to fireproof fabrics, paper and plastics, as a paint pigment and for many other uses.
• Liquid; Dry Powder; Large Crystals; Large Crystals; Other Solid; CBI
• Crystals; [Merck Index]
• WHITE CRYSTALLINE ODOURLESS POWDER.
• Colorless, cubic form (valentinite); colorless (senarmontite)
• Crystals, polymorphic

Regulatory Status

Regulatory & Food Contact	FDA Cumulative Estimated Daily Intake (CEDI): FCS

GHS Hazard Classification

Reported hazard statements	H351, H373 (10.3%), H350, H401, H411, H302, H371, H372

Documented Uses

• Used to make tartar emetic, paint pigments, stains for iron and copper, enamels, ceramics, glasses, mordants, plastic stabilizers, phosphors, and flame-retardants for canvas, textiles, and plastics; [HSDB] Workers may be exposed manufacturing or using batteries, printing machines, bearings, textiles, and ceramics; [Kanerva, p. 1753]
• Semiconductor Manufacturing [Category: Industry]
• Battery Manufacturing [Category: Industry]
• Textiles (Fiber & Fabric Manufacturing) [Category: Industry]
• Ceramics making [Category: Hobbies]
• Manufacture of tartar emetic; as paint pigment; in enamels and glasses; as mordant; as fire retardant for textiles, canvas, rubber, adhesives, pigments, and paper.

Synonyms

Diantimony trioxide; Antimonious oxide; Antimony sesquioxide; Exitelite; Timonox; Twinkling star; Antimony White; Thermoguard B; Thermoguard L; Thermoguard S; White star; Fireshield H; Dechlorane A-O; Stibiox MS; Amspec-KR; Patox C

Frequently Asked Questions

What are the CAS number and molecular formula of Antimony trioxide?

CAS 1309-64-4; molecular formula Sb2O3; molecular weight 289.79 g/mol.

What other names is Antimony trioxide known by?

Diantimony trioxide, Antimonious oxide, Antimony sesquioxide, Exitelite, Timonox, Twinkling star.

What is the regulatory status of Antimony trioxide?

Documented regulatory listings: FDA Cumulative Estimated Daily Intake (CEDI): FCS.

Is Antimony trioxide classified as hazardous?

Hazard statements reported: H351, H373, H350, H401, H411.

What are the key physical properties of Antimony trioxide?

Boiling Point: 1425 °C; Boiling Point: 1425 °C @760 [mm Hg]; Melting Point: 1211 °F (NTP, 1992); Melting Point: 655 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.