Antimony Trioxide

Antimony Trioxide

CAS Number
1309-64-4
Molecular Formula
O3Sb2
SynergistHalogenated flame retardantPET CatalystStandard Grade: 99.5Extra Pure Grade: 99.8Catalyst Grade: 99.9Purity: 99.5%, 99.8%, 99.9%Buy Antimony Trioxide BulkCAS 1309-64-4 manufacturer

About Antimony Trioxide

Antimony Trioxide, with the chemical formula (Sb₂O₃), is a fine white crystalline powder widely recognized for its flame-retardant properties and catalytic activity in industrial applications. It is primarily used as a flame retardant synergist, catalyst, and opacifier across various U.S. manufacturing industries, incl...

Synonyms

  • ANTIMONY TRIOXIDE
  • Antimony oxide
  • Antimony(III) oxide
  • Flowers of antimony
  • CI Pigment white 11

Antimony Trioxide Specifications

CAS Number
1309-64-4
Molecular Formula
O3Sb2
Molecular Weight
291.52 g/mol
IUPAC NameORBotanical Name
bis(antimony(3+));tris(oxygen(2-))
Canonical SMILES
[O-2].[O-2].[O-2].[Sb+3].[Sb+3]
InChI Key
GHPGOEFPKIHBNM-UHFFFAOYSA-N
InChI
1S/3O.2Sb/q3*-2;2*+3
EINECS Number
215-175-0
MDL Number
MFCD00011214
UNSPSC Code
12352303
eClass
38080202
HSN No
28258010
Molecular Weight
291.52 g/mol
Melting Point
656°C
Solubility
Insoluble in water, soluble in acids
Apperance
White Free Flowing Powder Free Form Visible Contamination
Color
White
Odor
Odorless
Boiling Point
1590°C
Density
5.4 g/cm³
Pb
0.04 Max (ICP-OES)
Stability period
5 years
(H) Statements Code
H302, H315, H319, H335
(P) Statements Code
P264, P270, P301 + P312, P305 + P351 + P338
GHS Classification
Category 2, 2A, 3, 4
Storage Class Code
13 - Non-combustible solids
Hazard Classification
Harmful by ingestion, may cause respiratory irritation, skin, and eye irritation
Water Hazard Class
WGK 2 (Class 2: hazardous to water)

Plastics & Rubber Manufacturing

Antimony trioxide is a key flame retardant synergist in polymers such as PVC, polyethylene (PE), and polypropylene (PP). It is also found in rubber compounds used in the U.S. automotive, electrical, and construction sectors. It enables materials to meet U.S. fire safety standards like UL-94 by forming protective char layers during combustion.

Coatings, paints, and adhesives

Antimony trioxide enhances the fire resistance and thermal stability of finished products. It is used in protective coatings for industrial infrastructure, specialty paints, and high-performance adhesives to meet fire safety and durability requirements.

Textile and fire-resistant fabrics

Antimony trioxide helps produce flame-resistant fabrics and upholstery for safety apparel, furnishings, and industrial environments in the U.S. Its synergistic action with halogenated flame retardants ensures compliance with fire regulations.

Glass and Ceramic manufacturing

Antimony trioxide is used as a fining agent and opacifier. It helps to remove gas bubbles and increase clarity, as well as imparting opacity in ceramics and enamels. U.S.manufacturers use it for high-quality decorative, optical, and architectural glass products.

Temperature

20–25°C (68–77°F)

Environment

Keep in a cool, dry place away from light and moisture

Protection

Use airtight containers to prevent contamination

Packaging

Packaged 50-kilogram HDPE bags

Detail 5

Each pallet is stretch-wrapped in polyethylene to ensure the bags remain secure during transit

Detail 6

Alternative package: 500-kilogram big bags

  1. ANTIMONY TRIOXIDE
  2. Antimony oxide
  3. Antimony(III) oxide
  4. Flowers of antimony
  5. CI Pigment white 11

Antimony Trioxide FAQs

Minimum Order Quantity

25 kg (evaluation) · 1 MT (commercial)

Lead Time

3 – 5 weeks estimated

Delivery Terms

FOB*

Packaging

20 L pails, 200 L HDPE drums, 1000 L IBC

US Availability

US Facility Inventory

Documentation

US SDS · COA · TDS · Specification sheet

US Regulatory & Quality Information

TSCA status*

US SDS / HazCom*

GHS classification*

ISO 9001:2015 site*

DOT shipping classification*

FDA status*

EPA status*

California Prop 65*

Reliable US supply chain

Regulatory compliance

On-time delivery

Technical expert support

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