Physicochemical properties of antimony trioxide!

Release time:

2024-03-12 08:42

Antimony trioxide is an inorganic compound with the chemical formula Sb2O3. Natural products called antimony, commonly known as antimony white, white crystalline powder. Melting point 655 ℃. Boiling point 1550 ℃. Soluble in sodium hydroxide solution, hot tartaric acid solution, bitartrate solution and sodium sulfide solution, slightly soluble in water 370±37 µg/L, dilute nitric acid and dilute sulfuric acid. There is a carcinogenic possibility. There are two kinds of preparation methods, dry and wet, which are mainly used for white pigments, paints and plastics, and can play the role of pigments and flame retardants.


Used for catalyst, mordant, fabric, paper, plastic flame retardant, glass decolorant. For the preparation of potassium antimony tartrate, glaze, fire retardant. Manufacture of lead softeners.

Antimony trioxide is the earliest flame retardant, suitable for epoxy resin, polyurethane, chloroprene rubber, polystyrene, polyvinyl chloride, polyester, etc., when used alone, the dosage is large, the flame retardant effect is poor (unless the flame retardant contains halogen), when combined with halogen compound (R.HX), it has good synergistic effect, and the flame retardant effect is obviously improved.

Antimony trioxide is an additive flame retardant, often used with other flame retardants and smoke suppressants, which can produce synergistic effects between the components. Antimony trioxide in the early stage of combustion, the first is melting, forming a protective film on the surface of the material to isolate the air, through the internal endothermic reaction, reduce the combustion temperature. Antimony trioxide is gasified at high temperature, which dilutes the oxygen concentration in the air, thus playing a flame retardant role.

Antimony trioxide

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