Diantimony trioxide CAS#1309-64-4

Dual Crystal Forms:Available in orthorhombic (valentinite) and cubic (senarmontite) structures, offering stable physical properties for diverse industrial applications.


High Thermal Stability:Melts at 656 °C and sublimes at elevated temperatures, ensuring reliable performance in high-temperature processing and refining operations.


Excellent Chemical Resistance:Practically insoluble in water and organic solvents, while readily soluble in acids and alkalis, enabling controlled reactivity in chemical formulations.


High Purity Optical Properties:High refractive index (2.087) and well-defined molecular structure (Sb₂O₆ dimers) support use in specialty glass, ceramics, and catalyst systems.



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Product Description

Product Description of ‌Diantimony trioxide CAS#1309-64-4

Antimony trioxide: orthorhombic (valentinite, 5.67 g/cm³) or cubic (senarmontite, 5.20 g/cm³, dimeric Sb₂O₆). Refractive index 2.087; mp 656 °C (O₂-free); bp 1550 °C (sublimes); sublimes at 400 °C (vacuum). Very slightly soluble in water, insoluble in organics; soluble in HCl, caustic alkalis and tartaric acid.


Product Application of Diantimony trioxide CAS#1309-64-4

Diantimony trioxide is a key flame-retardant additive for plastics. Industrial grades (99.0–99.9% purity) are produced by oxidizing antimony metal/sulfide ores at 600–800 °C, with particle size controlled via processing. Also used as a white pigment; fine particles maximize whiteness/opacity, coarse grades for translucent plastics. Insoluble in water, low moisture loss.


Product Information

Parameters


Melting point655 °C (lit.)
Boiling point1550 °C (lit.)
bulk density800-1300kg/m3
density5.2
vapor pressure13.3 hPa (660 °C)
Fp1550°C subl.
storage temp.Store below +30°C.
solubility2.70mg/l
formpowder
colorWhite
Specific Gravity5.67
Odorwh. cubic or orthorhombic cryst., odorless
biological sourcerabbit
Water SolubilitySlightly soluble. <0.1 g/100 mL at 20 ºC
crystal systemCube
Merck14,711
Space groupFd3m
Lattice constanta/nmb/nmc/nmα/oβ/oγ/oV/nm31.1141.1141.1149090901.3825
Exposure limitsACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
Stability:Stable.
InChIKeyMUBFITUCTVFSOJ-UHFFFAOYSA-L
CAS DataBase Reference1309-64-4(CAS DataBase Reference)
IARC2B (Vol. 47) 1989
NIST Chemistry ReferenceAntimony trioxide(1309-64-4)
EPA Substance Registry SystemAntimony trioxide (1309-64-4)


Safety Information
Hazard CodesXn,Xi,T
Risk Statements40-61
Safety Statements22-36/37-45-53
RIDADR1549
WGK Germany2
RTECSCC5650000
Hazard NoteIrritant
TSCAYes
HazardClass6.1
PackingGroupIII
HS Code28258000
Hazardous Substances Data1309-64-4(Hazardous Substances Data)
ToxicityLD50 orally in rats: >20 g/kg (Smyth)


Safety Information


Hazard CodesXn,Xi,T
Risk Statements40-61
Safety Statements22-36/37-45-53
RIDADR1549
WGK Germany2
RTECSCC5650000
Hazard NoteIrritant
TSCAYes
HazardClass6.1
PackingGroupIII
HS Code28258000
Hazardous Substances Data1309-64-4(Hazardous Substances Data)
ToxicityLD50 orally in rats: >20 g/kg (Smyth)


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