What is Antimony Trioxide CAS 1309-64-4?

Antimony Trioxide, also called diantimony trioxide or antimony(III) oxide, CAS 1309-64-4, is the inorganic compound Sb2O3. It is a white crystalline powder with high thermal stability, very low water solubility, and a density of about 5.2-5.7 g/cm3.

Why is Antimony Trioxide called a flame-retardant synergist?

Antimony Trioxide generally does not provide sufficient flame retardancy by itself. It is called a synergist because it works with halogenated flame retardants, where the antimony and halogen form flame-inhibiting antimony halide species during combustion and improve self-extinguishing performance.

How is Antimony Trioxide used with halogenated flame retardants?

It is normally combined with brominated or chlorinated flame retardants in PVC, cable compounds, rubber, plastics, textiles and coatings. The ratio and grade depend on the polymer and the halogen source, and the combination is more effective than either component alone.

What are the main applications of Antimony Trioxide?

The main use is as a flame-retardant synergist in PVC, cables, rubber, plastics, textiles and coatings. It is also used in glass and ceramics, and in pigment-related applications where controlled whiteness and dispersion are important.

What grades and forms are available for industrial handling?

Industrial grades commonly specify Sb2O3 content around 99.5% or higher, with particle size and residue limits selected for the end use. Besides standard powder, dust-free wetted grades using DOP, DIDP, DINP or similar wetting agents and pre-dispersed masterbatch forms are available to reduce dust and improve dispersion.

Antimony Trioxide CAS 1309-64-4

Antimony Trioxide, also called diantimony trioxide or antimony(III) oxide, CAS 1309-64-4, is an inorganic flame-retardant synergist supplied for halogenated polymer applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 1309-64-4
Synonyms: Antimony(III) oxide, Diantimony trioxide, ATO, Antimonous oxide, Antimony oxide, Sb2O3
Einecs: 215-175-0
Molecular Formula: Sb₂O₃
Grade: Industrial Grade
Package: 25 kg bag (standard); 500 kg / 1000 kg big bag optional

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Product Description

Antimony Trioxide, also called diantimony trioxide or antimony(III) oxide, CAS 1309-64-4, is the inorganic compound Sb2O3.

Synonyms: Antimony(III) oxide; Diantimony trioxide; ATO; Antimonous oxide; Antimony oxide; Sb2O3.

CAS: 1309-64-4.

It has the molecular formula Sb2O3 and a molecular weight of 291.52 g/mol.

It appears as a white crystalline powder.

It has a density of about 5.2–5.7 g/cm³ and a melting point of about 656°C.

It has very low water solubility and is soluble in acids.

It acts as a flame-retardant synergist with halogenated flame retardants.

During combustion, antimony and halogen form flame-inhibiting antimony halide species.

It is used in PVC, cable compounds, rubber, plastics, textiles and coatings.

It is used in glass and ceramics.

It is used in pigment-related applications where whiteness and dispersion matter.

Dust-free wetted grades and pre-dispersed masterbatch forms are available.

Industrial grades commonly specify Sb2O3 content of about 99.5% or higher.

Confirm appearance, Sb2O3 content, particle size, residue limits, density and melting point.

Store in a cool, dry, well-ventilated place in sealed original packaging, away from moisture and direct sunlight.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Antimony Trioxide CAS 1309-64-4?

A: Antimony Trioxide, also called diantimony trioxide or antimony(III) oxide, CAS 1309-64-4, is the inorganic compound Sb2O3. It is a white crystalline powder with high thermal stability, very low water solubility, and a density of about 5.2-5.7 g/cm3.
Q:
Why is Antimony Trioxide called a flame-retardant synergist?

A: Antimony Trioxide generally does not provide sufficient flame retardancy by itself. It is called a synergist because it works with halogenated flame retardants, where the antimony and halogen form flame-inhibiting antimony halide species during combustion and improve self-extinguishing performance.
Q:
How is Antimony Trioxide used with halogenated flame retardants?

A: It is normally combined with brominated or chlorinated flame retardants in PVC, cable compounds, rubber, plastics, textiles and coatings. The ratio and grade depend on the polymer and the halogen source, and the combination is more effective than either component alone.
Q:
What are the main applications of Antimony Trioxide?

A: The main use is as a flame-retardant synergist in PVC, cables, rubber, plastics, textiles and coatings. It is also used in glass and ceramics, and in pigment-related applications where controlled whiteness and dispersion are important.
Q:
What grades and forms are available for industrial handling?

A: Industrial grades commonly specify Sb2O3 content around 99.5% or higher, with particle size and residue limits selected for the end use. Besides standard powder, dust-free wetted grades using DOP, DIDP, DINP or similar wetting agents and pre-dispersed masterbatch forms are available to reduce dust and improve dispersion.

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