Aluminium Hydroxide - Fengbai Group

Product Name: Aluminium Hydroxide
Synonyms: Aluminium Trihydroxide
Appearance: White powder
CAS No: 21645-51-2
HS Code: 2818300000
EINECS NO: 244-492-7
Molecular Formula: Al(OH)3

Aluminium hydroxide (Al(OH)3), also known as aluminium trihydroxide, is an inorganic compound widely used in many industrial fields due to its unique chemical and physical properties. It occurs naturally as the mineral gibbsite and is also synthesized for various industrial purposes. This white, amorphous aluminium hydroxide powder is amphoteric, meaning it can react with both acids and bases, making it a versatile material in multiple fields. According to the applications, aluminum hydroxide can be divided into industrial grade and medical grade.

Items	Result
AL(OH)3 Content %	99.71
SiO2 %	0.005
Fe2O3 %	0.008
Na2O %	0.18
Whiteness %	97.83
Moisture	0.15
Specific gravity	3.4
PH value of water suspension	8.2
Oil absorption g/100g	29
Average particle size µm	5.03
Refractive index	1.58
Packing	20kg/bag (Craft paper bag with inner polyethylene film bag)

Physical and Chemical Properties of Aluminum hydroxide Al(OH)3

Appearance and Solubility. It is a fine, white, odorless powder that is insoluble in water but soluble in strong acids and bases.

Thermal Stability. When heated above 180℃, aluminium trihydroxide decomposes into aluminum oxide (Al2O3) and water, a property exploited in flame-retardant applications.

Solubility and hygroscopicity. It is almost insoluble in water (solubility ~0.001 g/100 mL, 25°C), but soluble in strong acids (HCl, H2SO4) and strong bases (NaOH). The Al(OH)3 powder has low hygroscopicity, but may absorb small amounts of water in high humidity environments.

Amphoteric Nature. It reacts with acids to form aluminum salts and with bases to produce aluminates, enhancing its utility in chemical processes.

Particle Size and Surface Area. Industrial grade aluminum hydroxide is available in various particle sizes, affecting its reactivity and suitability for different applications.

Applications of Aluminium Hydroxide Powder

1. Flame Retardant

Aluminum hydroxide powder is the inorganic flame retardant additive with the largest amount and widest application. As a flame retardant, aluminum hydroxide can not only retard flames, but also prevent smoke, dripping, and toxic gases. When exposed to heat, it releases water vapor, which cools the material and dilutes flammable gases. Its decomposition also forms a protective alumina layer, further inhibiting combustion. Therefore, it has been widely used and its usage is increasing year by year. It can be used in thermosetting plastics, thermoplastics, synthetic rubber, coatings, building materials and other industries.
2.Filler in Plastics and Composites

Aluminum hydroxide is non-toxic, odorless, has good dispersibility, high whiteness, and low iron content. It is a good filler for producing artificial marble products. Artificial stone products produced with it have high brightness, smooth surface, good stain resistance, wear resistance, impact resistance, and high structural strength. Aluminum hydroxide can also be used as a toothpaste abrasive to improve the detergency and chemical stability of toothpaste. In addition, aluminium trihydroxide can be added to polymers, paints, and adhesives to improve mechanical properties, reduce costs, and enhance fire resistance.
3. An important chemical intermediate

Aluminium trihydroxide powder can be used to make alumina, various aluminum salts (aluminum sulfate, polyaluminum chloride, etc.), sodium aluminate, organic aluminum compounds and other functional materials. Its derivative products are widely used in metallurgy, water treatment, petrochemical, pharmaceutical, building materials and other industries. According to different chemical reactions, aluminum hydroxide chemical can be converted into a variety of high value-added chemicals.
4. Pharmaceutical and Medical Applications

In medicine, aluminium hydroxide is used as an antacid to neutralize stomach acid, treating conditions like heartburn and ulcers. It is also an adjuvant in vaccines, enhancing immune responses.

Aluminium Hydroxide Price

As the world’s largest aluminum hydroxide manufacturer, China has a great price advantage. Aluminum hydroxide is mainly produced from bauxite through the Bayer process. Bauxite price fluctuations directly affect costs. Calcination, drying and other processes rely on natural gas or electricity. Rising energy prices push up production costs. The growing demand for flame retardants (plastics, rubber industry) pushes up prices. In addition, affected by a variety of factors, its price fluctuates greatly. If you need it, please feel free to contact us to get the latest and most competitive aluminum hydroxide price.