What is Antimony Trioxide (Sb₂O₃)?

Antimony Trioxide is a fine, white crystalline powder primarily used as a flame retardant synergist, especially when combined with halogenated compounds. It works by promoting char formation and reducing smoke production during combustion. In addition to its flame-retardant capabilities, ATO also plays an important role in the production of PET plastics, glass, ceramics, and pigments.

Core features include:

• Chemical Formula: Sb₂O₃
• Appearance: White, odorless powder
• Melting Point: ~656°C
• Density: 5.2–5.7 g/cm³
• Solubility: Insoluble in water; soluble in concentrated acids and alkalis
• Particle Sizes: Micronized grades available for high-dispersion applications

Primary Applications

Thanks to its multifunctional properties, Antimony Trioxide is used in a wide range of industrial processes and end-use products. From improving fire resistance in plastics to acting as a catalyst in PET production, ATO continues to be a reliable and essential material across sectors.

Common uses include:

• Flame retardants in polymers such as PVC, PE, PP, PS, ABS, EPDM, and polyesters
• Masterbatch and plastic compounding
• Textile back coatings and upholstery finishes
• Glass and ceramic opacification
• Catalyst in PET resin production
• Paints, pigments, enamels, and specialty coatings

Grades We Offer

California Plastics offers a wide selection of Antimony Trioxide grades tailored to different manufacturing environments and regulatory requirements. Our products are available in various particle sizes and purities to help optimize dispersion, processability, and end-product performance.

Available grades include:

• Low Free Antimony Grades: Environmentally conscious options with reduced toxicity
• Micronized Grades: For high-dispersion systems like coatings, inks, and masterbatches
• General-Purpose Grades: Ideal for plastics, rubber, and textile applications
• High-Purity Grades: Suited for electronics, optics, and specialty materials
• Custom Particle Sizes: Made-to-order to fit your exact technical needs

All grades are available in bags, supersacks, or drums, with inventory stocked and ready to ship across North America. Every shipment includes full documentation, including COAs, SDS, and REACH compliance reports.

Data Sheets and Testing

At California Plastics, we are committed to providing the technical transparency and documentation you need to make confident material choices. Our Antimony Trioxide (ATO) offerings are backed by complete testing data and certifications to support quality, safety, and regulatory compliance across a wide range of industries.

• Technical Data Sheet PDF
• Safety Data Sheet PDF
• ISO14001 Certificate PDF
• ISO9001 Certificate PDF
• SGS Testing Certificate PDF

Why Choose California Plastics as Your ATO Supplier?

At California Plastics, we understand the importance of product consistency, availability, and support. That’s why we’ve partnered with trusted global manufacturers to offer ATO that meets the highest standards for performance and purity. With warehouses located across the U.S., we ensure short lead times and dependable delivery.

What sets us apart:

• Fast lead times and broad inventory coverage
• Competitive pricing with flexible minimum order quantities
• Technical guidance for formulation and process optimization
• Commitment to customer success and quality assurance

Ready to get started?
Contact us today for samples, technical data sheets, or a custom quote. Let California Plastics be your trusted partner for Antimony Trioxide and other advanced materials.