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Antimony Trioxide
SINOBIO
2825800000
Antimony Trioxide (ATO), with the chemical formula Sb₂O₃ and CAS No. 1309-64-4, is an inorganic industrial chemical widely used as a flame-retardant synergist, pigment and chemical intermediate. Sinobio supplies Antimony Trioxide in high-purity grades including 99.5%, 99.8% and 99.9%, with a typical particle size of 1–3 μm that can be customized according to customer requirements.
The product is supplied as a white powder with good thermal stability and is suitable for a variety of industrial manufacturing processes. Antimony Trioxide is commonly used together with other flame-retardant systems in plastics, rubber, textiles and electronic materials. It is also used in paints, white glass, enamel and other material production applications.
With consistent purity, controlled particle size and flexible packaging options, Sinobio Antimony Trioxide is suitable for both industrial bulk supply and smaller-scale testing requirements.
For product specifications, COA, sample availability, packaging, MOQ and quotation, please contact Sinobio Chemistry.
Antimony Trioxide is widely used as a flame-retardant synergist in plastics, rubber, textiles and electronic materials. It is commonly formulated with other flame-retardant systems to improve fire-resistance performance.
The fine particle size and high purity make Sb₂O₃ suitable for incorporation into selected plastic and rubber formulations requiring flame-retardant systems.
Antimony Trioxide can be used as a synergistic additive in flame-retardant textile formulations.
With a listed whiteness of ≥95.3%, Antimony Trioxide can be used in selected pigment and material-production applications, including paints, white glass and enamel.
Antimony Trioxide is also used as an intermediate or catalyst-related raw material in the production of antimony-containing compounds.

A1: Antimony Trioxide is an inorganic compound with the chemical formula Sb₂O₃ and CAS No. 1309-64-4, widely used as a flame-retardant synergist and industrial chemical.
A2: The CAS number of Antimony Trioxide is 1309-64-4.
A3: The product specification lists 99% min, with 99.5%, 99.8% and 99.9% grades available.
A4: Antimony Trioxide is supplied as a white powder.
A5: The standard particle size is 1–3 μm, and customized particle sizes can be supplied according to customer requirements.
A6: Antimony Trioxide is mainly used as a flame-retardant synergist in plastics, rubber, textiles and electronic materials. It is also used in pigments, glass, enamel and chemical applications.
A7: Yes. Antimony Trioxide is widely used as a synergistic additive in flame-retardant plastic formulations.
A8: Yes. Sb₂O₃ can be used in selected flame-retardant rubber formulations.
A9: Yes. Antimony Trioxide can be used as a synergist in selected flame-retardant textile systems.
A10: Standard packaging includes 25 kg kraft bags, while bulk orders can use 500 kg or 1000 kg super sacks. Customized 1 kg, 5 kg and 10 kg packaging is also available.
A11: Yes. Samples are available for customer testing and evaluation.
A12: Yes. Sinobio lists 99.5%, 99.8% and 99.9% Antimony Trioxide grades.
A13: Yes. The standard particle size is 1–3 μm, and particle size can be customized according to customer requirements.
A14: Sinobio Chemistry supplies Antimony Trioxide for industrial applications and offers bulk supply, samples and customized packaging according to customer requirements.
A15: Please provide your required purity, particle size, order quantity, packaging requirements and destination port so we can prepare a suitable quotation.
Item | Specification |
|---|---|
Product Name | Antimony Trioxide / ATO |
Chemical Name | Antimony Trioxide |
CAS No. | 1309-64-4 |
Molecular Formula | Sb₂O₃ / O₃Sb₂ |
Molecular Weight | 291.52 g/mol |
Purity | 99% min |
Available Grades | 99.5%, 99.8%, 99.9% |
Appearance | White Powder |
Particle Size | 1–3 μm |
Particle Size Customization | Available |
Melting Point | Approx. 656°C |
Boiling Point | Approx. 1456°C |
Sb₂O₃ Content | ≥99.58% |
As₂O₃ Content | ≤0.020% |
PbO Content | ≤0.055% |
Fe₂O₃ Content | ≤0.0038% |
CuO Content | ≤0.0012% |
Se Content | ≤0.0010% |
Whiteness | ≥95.3% |
Net Weight per Batch | 20 MT |
Sample | Available |
Standard Packaging | 25 kg Kraft Bag |
Pallet Packaging | 1 MT / Pallet |
Bulk Packaging | 500 kg / 1000 kg Super Sack |
Custom Packaging | 1 kg / 5 kg / 10 kg Available |
Main Application | Flame Retardant |
Other Applications | Pigment, Glass, Enamel, Chemical Intermediate |
Supply Type | Industrial Bulk Supply |
1. High-Purity Grades
Available in 99.5%, 99.8% and 99.9% purity grades, meeting different industrial formulation and application requirements.
2. Fine & Uniform Particle Size
Standard particle size is 1–3 μm, supporting good dispersion and consistent performance in industrial formulations. Customized particle sizes are also available.
3. Excellent Flame-Retardant Synergy
Antimony Trioxide (Sb₂O₃) is widely used as a flame-retardant synergist in plastics, rubber, textiles and other polymer materials.
4. Wide Industrial Applications
Suitable for flame-retardant systems, plastics, rubber, textiles, paints, glass, enamel and other industrial applications.
5. Stable White Powder
Supplied as a white powder with listed whiteness of ≥95.3%, suitable for applications where appearance and material consistency are important.
6. Flexible Packaging Options
Available in 25 kg kraft bags, 500 kg and 1000 kg super sacks, with smaller customized packages such as 1 kg, 5 kg and 10 kg available according to requirements.
7. Bulk Supply Capability
Suitable for both sample testing and large-volume industrial procurement, supporting different purchasing requirements.
8. Customized Specifications
Particle size and packaging can be adjusted according to the customer's application, production process and purchasing requirements.
9. Quality-Controlled Raw Material
Controlled specifications for Sb₂O₃ content, As₂O₃, PbO, Fe₂O₃, CuO, Se and whiteness help customers evaluate product consistency for industrial use.
10. Professional B2B Supply Service
Samples, technical specifications, customized packaging and bulk orders can be arranged according to customer requirements.
Sinobio Antimony Trioxide is available in flexible packaging options for both industrial bulk orders and small-volume testing.
*Standard Packaging
25 kg kraft bags
Shrink-wrapped and palletized
1 metric ton per pallet
*Bulk Packaging
500 kg super sacks
1000 kg super sacks
*Custom Packaging
1 kg
5 kg
10 kg
Samples are available upon request. Packaging and shipping arrangements can be confirmed according to order quantity, packaging requirements and destination.
For a shipping quotation, please provide the required purity, particle size, quantity and destination port.