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 (ATH), 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

Flame retardant. 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, the aluminum hydroxide powder is the inorganic flame retardant additive with the largest amount and widest application. And it can be widely used in thermosetting plastics, thermoplastics, synthetic rubber, coatings, building materials and other industries.
Used as a water purifier. During the water treatment process, aluminum hydroxide can absorb suspended impurities in the water. When aluminium trihydroxide is added to water containing impurities, it will form a colloid, which has a large surface area and can adsorb tiny particle impurities in the water on its surface, causing the impurities to gather together and eventually settle down to achieve the purpose of purifying the water quality.
Catalyst carrier. Many chemical reactions require catalysts to speed up the reaction rate. Aluminum hydroxide has a large specific surface area and a suitable pore structure, which can load various active components and make the catalyst work better. In the field of petrochemicals, some hydrocracking catalysts use aluminium hydroxide as a carrier, which can improve the reaction efficiency in the oil processing process and produce better quality oil products.
In the medical field, aluminium hydroxide is often made into antacids. The main component of gastric acid is hydrochloric acid. When gastric acid is secreted too much, it will cause stomach pain, heartburn and other discomfort symptoms. Aluminum hydroxide can react with gastric acid to neutralize and relieve excessive gastric acid.
In the papermaking industry, aluminum hydroxide can be used as a filler. That’s because it can improve the properties of paper, such as increasing the whiteness and opacity of paper. When producing writing paper and printing paper, adding aluminum hydroxide can make the paper look whiter, the handwriting and patterns clearer, improve the quality of paper and printing effect, and make the colors of printed products more vivid.
As a filler and reinforcing agent in the rubber industry. ATH aluminium trihydroxide can increase the volume of rubber, reduce the cost of rubber products, and improve the strength, hardness and other properties of rubber. For example, in the process of manufacturing tires, adding an appropriate amount of aluminium hydroxide can not only reduce costs, but also make the tires more wear-resistant and durable, thereby extending the service life of the tires.
Cosmetics industry. It can be used as an antiperspirant and thickener. In some antiperspirant products, aluminium hydroxide can react with sweat on the skin surface to form a protective film, reduce sweat secretion, and achieve an antiperspirant effect. At the same time, in skin care products, aluminium trihydroxide can be used as a thickener to adjust the texture of the product, so that the skin care products have a suitable consistency and are easy to use and store.
Ceramic production. As one of the raw materials for ceramics, aluminum hydroxide can improve the performance of ceramic green bodies, and increase the mechanical strength and thermal stability of ceramics. When making high-temperature ceramics, this chemical can react at high temperatures to form a stable structure, allowing the ceramics to maintain good shape and performance in high-temperature environments. Therefore, it is widely used in electronic ceramics and other fields.
One of the abrasive ingredients in toothpaste. During the brushing process, aluminium hydroxide can rub against the dirt on the surface of the teeth, helping to remove stains and dental plaque on the teeth. At the same time, it is relatively mild and will not excessively wear the enamel on the surface of the teeth. It can protect the health of the teeth while cleaning them.
Glass manufacturing industry. Aluminum hydroxide can be used as a clarifier and flux for glass. It can reduce the surface tension of glass liquid, make it easier to discharge bubbles in the glass liquid, and improve the transparency and uniformity of the glass. At the same time, it can also lower the melting point of glass, reduce energy consumption in the glass manufacturing process, and improve production efficiency. Therefore, it is used in the production of various glass products.

About 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.