Antimony Trioxide

Uses of antimony trioxide
Antimony trioxide has a wide range of applications, with its primary use being as a flame retardant in plastic materials. Plastics are widely used in automobiles, home appliances, industrial machinery, and housing, but they are generally flammable. By adding antimony trioxide along with halogen-based flame retardants to these plastics, we can impart high flame retardancy, which reduces the risk of fires caused by electrical shorts or deterioration of electrical equipment. This helps prevent personal injury and economic loss from fires.
When combined with halogen-based flame retardants, our antimony trioxide exhibits excellent flame-retardant effects that meet the UL94 standards for flammability and the JIS flammability criteria (OI, Oxygen Index for Plastics). These are required in various fields.
We also offer special products that improve handling during your processes, such as wet products and slurries (specially processed antimony trioxide) as well as special packaging products.
Why Our Products Are Chosen
Wide range of particle sizes: We offer optimal products with particle sizes ranging from 20 nm to 10 µm, tailored to your specific application and requirements.
Optimized color development in plastics: Our products perform exceptionally well in plastics where pigment color development is crucial.
Our antimony trioxide is also highly regarded in the following applications:
- Polyester polymerization catalyst
- Varistor (electronic circuit protection component) material
- Glass clarifying agent
- White pigment applications
Using our accumulated knowledge, various evaluation methods, and diverse manufacturing processes, we can respond to our customers' diverse needs quickly and accurately. We contribute to improving the safety, durability, and environmental compatibility of products used in automobiles, building materials, and electronic components.

PATOX-L 10μm

PATOX-U 20nm (nanometers)
Grade Introductions
PATOX-M
A standard grade of antimony trioxide for flame retardancy with an average particle size of 0.5 µm. Its controlled and managed color tone and impurities contribute to stable flame retardancy, physical properties, and a uniform color tone in resins.
Technical Data
PATOX-MK
A standard grade for flame retardancy produced in our OEM factories in multiple countries under our quality assurance process. All products undergo a quality inspection at our facility.
Technical Data
PATOX-K
A flame retardant grade with an average particle size of 1.2 µm. It is characterized by its low opacity, making it suitable for plastics that require pigment adjustments. It helps with pigment colorability in plastics used for automotive interiors and appliance casings.
Technical Data
PATOX-KF
A flame retardant grade with an average particle size of 0.8 µm. The opacity can be adjusted, allowing for flexible selection based on the application.
Technical Data
PATOX-C
A high-purity grade optimized as a polyester (PET) polymerization catalyst. This product has few impurities and excellent polymerization activity, resulting in a stable, colorless polymer and contributing to the production of high-quality PET resin.
Application in Other Fields
Catalyst Use
With an average particle size of about 1 µm, this is an option for flame-retardant applications in plastics with a focus on opacity.
Pigment Use
This product has a proven track record as a component in inorganic yellow pigments (titanium yellow).
Varistor Use
It is added to varistors to control their performance and improve durability and lifespan.
Technical Data
PATOX-CF
A high-purity, fine-particle grade for catalysts with an average particle size of 0.3 µm. It has excellent solubility in ethylene glycol (EG) and suppresses the generation of byproducts that can degrade plastic quality.
Technical Data
PATOX-P
A flame retardant grade with an average particle size of 3 µm. It has low opacity in resins, which doesn't hinder pigment color development, resulting in stable color tones and colorability.
Technical Data
PATOX-L
A heat-resistant, high-grade product with an average particle size of 8 µm. Its small specific surface area improves the thermal decomposition inhibition and hydrolysis resistance of engineering plastics processed at high temperatures. Its low opacity also ensures stable color tones and color development.
Technical Data
PATOX-U
A nano-sized antimony trioxide with an average particle size of 20 nm, used in fields that require ultrafine particles. It has a large specific surface area and high catalytic activity.
- Catalyst Use: High catalytic activity per weight, achieving performance with a small amount of addition.
- Flame Retardant Use: Optimal for paints, adhesives, and semiconductor materials that require stable liquid properties with low separation.
Technical Data
PATOX-H
A reduced-impurity grade designed for varistors. It provides stable performance for varistors.
Technical Data
PATOX-MZ / PATOX-CZ
These grades are designed for electronic devices, with a precisely adjusted particle size distribution through a classification process. By eliminating coarse particles, they provide stable electrical properties for fine structures. They are particularly suitable for precision electronic components.
Technical Data
PATOX-HS
A high-grade product with low alpha-ray emissions and few ionic impurities, intended for electronic materials like IC sealing compounds.