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

Aluminum hydroxide (ATH), also known as aluminium trihydroxide, is a white powdery inorganic compound with the chemical formula Al(OH)₃. It is an amphoteric hydroxide, exhibiting both weak acidity and alkalinity, reacting with either acid or base under specific conditions. Aluminum hydroxide is a key intermediate in bauxite processing and is widely used in both industrial production and daily life. 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)

Performance Characteristics of Aluminium Hydroxide Al(OH)3

(1) Thermal Stability

ATH powder is chemically stable at room temperature and can withstand processing temperatures of 180-200°C, making it compatible with most polymer processing techniques. It is also resistant to deliquesce and deterioration in environments below 100°C, enhancing the long-term heat deformation resistance of finished products. It is suitable for applications such as wire and cable and automotive interiors.

(2) Flame Retardancy

Aluminum hydroxide exhibits excellent flame retardancy. Its flame retardancy mechanisms include heat absorption and cooling, water vapor dilution, and residual thermal insulation. It also produces no harmful byproducts during combustion, complying with environmental regulations. ATH is an ideal material for “low-smoke, low-toxicity” flame retardant applications and is widely used in polymer flame retardant applications.

(3) Impact on Mechanical Properties

As an inorganic filler flame retardant, ATH aluminum trihydroxide has a bidirectional effect on the mechanical properties of the substrate. A moderate addition (10%-30%) can enhance the material’s rigidity, compression resistance, and dimensional stability. Additions exceeding 40% can lead to a decrease in toughness due to poor compatibility, necessitating the addition of a coupling agent.

(4) Chemical Stability

This chemical exhibits excellent resistance to weak bases, saline solutions, and common organic solvents, in addition to strong acidic solutions. It does not react with polymer substrates at room temperature and is not susceptible to oxidation and deterioration, ensuring long-term material performance stability. It is suitable for products designed for use in complex environments such as outdoor and humid environments.

(5) Other Auxiliary Properties

Cost Advantage: Due to its wide availability of raw materials, production costs are lower than those of phosphorus- and nitrogen-based flame retardants. Flexible dosage allows for flame retardancy while maintaining overall cost control.

Low Smoke Suppression: The water vapor produced by decomposition can reduce smoke density during combustion by 30%-50%, improving visibility and escape safety during fires. Aluminium trihydroxide (ATH) is suitable for products designed for use in crowded places.

Adsorption: ATH aluminium hydroxide has a certain adsorption capacity, capable of absorbing odors, harmful gases, and impurities in liquids. It has applications in environmental protection fields (such as wastewater treatment and air purification).

Applications of Aluminum Hydroxide (ATH)

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, aluminium hydroxide (ATH) 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.