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1.01093

Sigma-Aldrich

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
MDL number:
MFCD00003420
UNSPSC Code:
12352305
NACRES:
NA.21

vapor pressure

<0.1 hPa ( 20 °C)

Quality Level

100

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

SMILES string

O[Al](O)O

InChI

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

InChI key

WNROFYMDJYEPJX-UHFFFAOYSA-K

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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.

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.

Legal Information

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

Storage Class Code

13 - Non Combustible Solids

WGK

nwg

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Regulatory Information

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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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