Aluminum hydroxide Properties
CAS No.21645-51-2
Chemical Name:Aluminum hydroxide
Molecular Formula:AlH3O3 Lewis structure
Molecular Weight:78
Melting point 300℃
Boiling point 2980℃[at 101 325 Pa]
Density 2.42 g/cm3 at 20 °C
vapor pressure <0.1 hPa (20 °C)
refractive index Average refractive index: 1.57-1.59
storage temp. Store at +5°C to +30°C.
solubility 0.0015g/l
Color White
Specific Gravity 2.42
Odor Odorless
PH Range >7
PH 8-9 (100g/l, H2O, 20℃)(slurry)
Water Solubility insoluble
Chemical properties
white crystalline powder; Insoluble in water and alcohol; soluble in inorganic acid and sodium hydroxide solution.
Uses
1. Chemical raw materials
Aluminum hydroxide has many advantages including large-scale production, adequate raw materials, high product purity and good solubility in acid. Therefore, aluminum hydroxide can be used as an important raw material for the preparation of aluminum salts, such as barium aluminate, aluminum sulfate and so on.
2. Flame retardants
Aluminum hydroxide powder is commonly regarded as an ideal flame retardant filler for plastics, unsaturated polyester, rubber and other organic polymers because of its filling, flame retardant and smoke-eliminating functions and non-toxic property. Flame retardant mechanism of aluminum hydroxide is as follows: when the temperature exceeds 200 ℃, the aluminum hydroxide begin to perform endothermic decomposition and release three crystal water, and its decomposition rate reaches the largest at 250℃.
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