The Most Common Use of Antimony Trioxide 

Antimony Trioxide Powder

If you haven’t heard of antimony trioxide, then you`re not alone. You’re one among many, and you may be surprised to learn that antimony trioxide is widely used in numerous ways other than glass-making. If you know where to look and how to use it properly, antimony trioxide may do much more than create a beautiful glass product!

Antimony trioxide is a white powder that can be used to produce various chemicals, including antimony halides. It is one of the most important organic compounds in producing other compounds and is used in manufacturing pesticides and pharmaceuticals.

Qualities of Antimony Trioxide


Antimony trioxide is a white powder that has a characteristic odor and taste. It is soluble in water. The chemical formula of antimony trioxide is Sb2O3. It is an alkali metal salt and an acidic salt. Antimony trioxide has the following characteristics:

  • High melting point: 553 °C;
  • Low softening point: ~400 °C;
  • High acidity, soluble in acids;
  • High solubility in water;
  • High relative density (1.57)

Because of these properties, antimony trioxide is widely used as an additive in manufacturing other chemicals.


Most common uses of Antimony Trioxide


The four most common uses of antimony trioxide include:

Manufacturing antimony alloys


Antimony trioxide is used in manufacturing antimony alloys (such as brass). It is also used to produce other alloys used to make batteries, bracelets, and other jewelry. Antimony trioxide has many industrial applications because it can be used as a catalyst and oxidant. For example, it can be used to produce perchlorate salts from carbon dioxide and water vapor.

Additive in Plastics


Antimony trioxide is also used as an additive in plastics such as polyvinyl chloride (PVC) and polystyrene. In these plastics, it acts as a plasticizer to increase their flexibility or softness. For example, PVC can be more flexible by adding antimony trioxide to its formulation.

Cleaning Metal


Antimony trioxide can be used to clean metal parts contaminated with chemicals or rust. You can use it as a cleaning solution or spray it on the surface of the metal to remove dirt, grime, and other substances. This process is especially useful if you have a large amount of dirty metal that needs to be cleaned up quickly.

Removing Rust


Antimony trioxide is a great way to remove rust from metal surfaces because it works quickly and efficiently. You can apply it directly to an affected area or use a rag or brush to apply it evenly across the surface.

Once applied, allow it to sit for at least 24 hours before wiping off the remaining residue with rubbing alcohol or some other degreasing agent. The results should be noticeable within 24 hours!



Antimony Trioxide is a high-temperature reducing agent which can be used to reduce the temperature of metals that are too hot for other methods. It is a general-purpose reducing agent and has the ability to reduce the melting point of alloys and oxides.

This product is also known as STP, although it is not an oxide but a sulfide. It has many applications in the metal industry, such as steel, copper, and aluminum processing industries.

It is important to note that antimony trioxide has been used for over 50 years by various companies in the metal industry because of its ability to “reduce” or “refine” the metals that are too hot for other reducing agents, such as sodium or magnesium. This product also works well with non-ferrous metals such as copper, lead, and zinc.

There are five major advantages of using antimony trioxide in the metal industry:

  • It reduces temperatures faster than other reducing agents
  • It reduces temperatures without methanol or ethanol fumes
  • It does not produce any toxic fumes during use
  • It does not produce acid fumes during use
  • It produces no slag residue



While, clearly, this compound is handy in different industries, it does come with a handful of downsides. The disadvantages of using antimony trioxide as a catalyst in the metal industry include the following:

  • It is carcinogenic with regard to inhalation and ingestion
  • It may be corrosive to some metals
  • It is not easily recyclable



The most common uses of antimony trioxide include its use as an additive in many different products, ranging from cosmetics to glass. In many of these products, it is used primarily as a binding agent. It is also one of the primary components in lead antimonide, which is used in creating infrared detectors and has been used to create temperature sensors for spacecraft.

Hopefully, you`ve learned a lot more about Antimony Trioxide through this write-up. Contact us to get a free quote!

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