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Merck
CN

1.01093

Aluminum hydroxide

(fine powder pure, hydrargillite), Technipur®

Synonym(s):

Aluminic acid, Aluminium trihydroxide, Aluminium(III) hydroxide, Hydrargillite, Hydrated alumina, Orthoaluminic acid

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About This Item

Linear Formula:
Al(OH)3
CAS Number:
21645-51-2
Molecular Weight:
78.00
UNSPSC Code:
12352305
NACRES:
NA.21
MDL number:
MFCD00003420

Key Documents

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Product Name

Aluminum hydroxide, (fine powder pure, hydrargillite), Technipur®

InChI

1S/Al.3H2O/h;3*1H2/q+3;;;/p-3

SMILES string

O[Al](O)O

InChI key

WNROFYMDJYEPJX-UHFFFAOYSA-K

vapor pressure

<0.1 hPa ( 20 °C)

pH

8-9 (20 °C, 100 g/L in H2O, slurry)

bp

>2900 °C/1013 hPa

mp

300 °C (Elimination of water of crystallisation)

density

2.42 g/cm3 at 20 °C

Quality Level

100

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Application

Aluminum hydroxide can be used as an inorganic filler in polymeric industries to produce high-voltage outdoor insulation materials (silicone rubber composites) to improve flame retardancy and tracking resistance properties. In the fabrication of glass fiber reinforced polymer (GFRP)- hybrid composites, aluminum hydroxide is used as a modifier to enhance the mechanical and fire-retardant properties of the composites.

Aluminum hydroxide also finds application in ceramic and glass industries to prepare heat resistance materials due to its non-flammability and high melting point characteristics.

General description

Aluminum hydroxide is an inorganic compound widely used as an additive in electronic and polymeric applications due to its wide availability, corrosion resistance, light weightlessness, high melting point, good fire-retardant properties, and also its ability to release water of hydration at high temperatures (about 220 °C) to resist chemical bond breaking.

Legal Information

Technipur is a registered trademark of Merck KGaA, Darmstadt, Germany

Storage Class

13 - Non Combustible Solids

wgk

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

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Certificates of Analysis (COA)

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Human health risk assessment for aluminium, aluminium oxide, and aluminium hydroxide
Krewski D, et al.
Journal of Toxicology and Environmental Health. Part B, Critical Reviews, 10(Suppl 1) (2007)
Dielectric spectroscopy of aluminium hydroxide particles filled silicone rubber and dielectric model analysis with modified numerical solutions
Lin Y, et al.
Journal of Physics D: Applied Physics, 53(27) (2020)
Preparation of glasses and ceramics from metal-organic compounds
Yoldas BE
J. Mater. Sci., 12, 1203-1208 (1977)
The Effect of Micro-Eggshells and Aluminium Hydroxide on Tracking Resistance of Silicone Rubber Composite
Khaigunha P, et al.
IOP Conference Series: Materials Science and Engineering, 859 (012009) (2020)
Investigation on Effect of Aluminium Hydroxide on Mechanical and Fire Retardant Properties of GFRP- Hybrid Composites
Hiremath P, et al.
Materials Today: Proceedings, 4(10), 10952-10956 (2017)

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