CI 77002 refers to an inorganic white compound predominantly composed of Aluminum Hydroxide with varying amounts of basic Aluminum Sulfate. It is widely used as a white pigment, opacifier, and filler in cosmetics, pharmaceuticals, and industrial products. Its properties make it an excellent base for formulations requiring stability, coverage, and light-reflecting abilities. This compound is particularly valued in products such as makeup, sunscreens, and antacids.

Chemical Composition and Structure
The primary component of CI 77002 is Aluminum Hydroxide (Al(OH)₃), with varying amounts of basic Aluminum Sulfate (Al₂(SO₄)(OH)₄). The presence of both components contributes to the pigment's opacity and stability, making it ideal for applications requiring high whiteness and good coverage. Aluminum Hydroxide also acts as an antacid in pharmaceutical products.

Physical Properties
CI 77002 appears as a fine, white powder that is insoluble in water but disperses well in cosmetic and industrial formulations. It provides excellent opacity and brightness, which is why it is often used as a filler or pigment in various products. It also has excellent stability against light and heat, making it a durable option for cosmetic and industrial use.

Production Process
The production of CI 77002 involves refining bauxite ore to extract aluminum hydroxide. Basic aluminum sulfate is then combined with the aluminum hydroxide to form the compound. The resulting product undergoes processing to achieve the desired particle size and purity for use in cosmetics, pharmaceuticals, and other products.

Chemical Name

Aluminium hydroxide sulphate

Chemical Industrial Synthesis Process

• Preparation of reagents. The main raw materials include aluminum hydroxide and aluminum sulfate.
• Dissolution of aluminum sulfate. The production of CI 77002 begins with the dissolution of aluminum sulfate in water to form an aluminum sulfate solution.
• Precipitation of aluminum hydroxide. Aluminum hydroxide is added to the aluminum sulfate solution. This addition causes the precipitation of aluminum hydroxide and basic aluminum sulfate. The reaction is controlled to maintain a balance between the two compounds.
• Filtration. The resulting mixture is filtered to separate the solid precipitate of aluminum hydroxide and basic aluminum sulfate from the aqueous solution.
• Washing. The precipitate is washed with deionized water to remove any soluble impurities.
• Drying. The washed precipitate is dried at controlled temperatures to remove residual moisture and obtain a fine powder.
• Grinding. The dried material is ground to obtain a fine and uniform powder.
• Stabilization. The CI 77002 powder is stabilized to ensure its stability during transportation and storage, preventing aggregation and degradation.
• Quality control. The CI 77002 undergoes rigorous quality testing to ensure it meets standards for purity and consistency. These tests include chemical analysis and physical tests to determine particle size and rheological properties.

What it is used for and where

CI 77002 is an inorganic white pigment noted for its chemical and thermal stability, making it suitable for use in products requiring prolonged resistance to heat and light degradation. Its aluminium hydroxide base imparts opacifying properties, used to enhance the coverage and texture of cosmetic products such as foundations, powders, and skin protective products. The basic aluminium sulfate adds a slight astringent hue, which can be advantageous in specific skin care formulations.

Cosmetics

Restricted cosmetic ingredient as IV/118 a Relevant Item in the Annexes of the European Cosmetics Regulation 1223/2009. Substance or ingredient reported:

• Aluminium hydroxide sulphate

Cosmetics - INCI Functions

Colorant. This ingredient has the function of colouring the solution in which it is inserted in a temporary, semi-permanent or permanent manner, either alone or in the presence of the complementary components added for colouring.

Safety

The presence of aluminium casts some doubt on whether this ingredient is safe.

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Molecular Formula    AlHO₅S

Molecular Weight   140.05 g/mol

CAS   1332-73-6    21645-51-2    8011-94-7

EC number   215-573-4    244-492-7

RTECS BD0940000

UNII    9QO62ZS7VO

Synonyms: 

Aluminum monohydroxide monosulfate