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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

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

13 - Non Combustible Solids

wgk_germany

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

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)

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