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239186

Sigma-Aldrich

Aluminum hydroxide

reagent grade

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About This Item

Fórmula lineal:
Al(OH)3
Número de CAS:
21645-51-2
Peso molecular:
78.00
EC Number:
244-492-7
MDL number:
MFCD00003420
UNSPSC Code:
12352305
PubChem Substance ID:
329752517
NACRES:
NA.55
concentration:
50.0-57.5% (Al (as Al2O3), EDTA titration)
grade:
reagent grade
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grade

reagent grade

Quality Level

100

form

powder

composition

Al2O3, 50-57%

concentration

50.0-57.5% (Al (as Al2O3), EDTA titration)

solubility

water: insoluble

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 (Al (OH)3) is an amphoteric compound, soluble in both base and acids. It is used as a precursor for alumina catalysts and flame-retardant materials. Aluminum hydroxide is primarily used as a feedstock to produce other aluminum compounds, including sodium aluminate, activated alumina, aluminum nitrate, zeolites, polyaluminum chloride, aluminum chloride, and specialty calcined aluminas.

Application

Aluminum hydroxide may be used:
  • In the preparation of Li2O–Al2O3–SiO2 (LAS) glass-ceramic systems.
  • As a aluminum precursor in the preparation of alumina.

Other Notes

may contain aluminum carbonate species

Storage Class

13 - Non Combustible Solids

wgk_germany

nwg

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificados de análisis (COA)

Lot/Batch Number
0000325964
0000325965
0000363962
MKCW2481
MKCV5819

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Property enhancement of kenaf fiber reinforced composites by in situ aluminum hydroxide impregnation.
Xia C, et al.
Industrial Crops and Products, 79, 131-136 (2016)
Hydrothermal extraction of potassium from potassic quartz syenite and preparation of aluminum hydroxide.
Ma X, et al.
International Journal of Mineral Processing, 147, 10-17 (2016)
Arsenate adsorption on amorphous aluminum hydroxide.
Anderson MA, et al.
Journal of Colloid and Interface Science, 54(3), 391-399 (1976)
Biosorption of fluoride from drinking water using spent mushroom compost biochar coated with aluminum hydroxide.
Chen GJ, et al.
Desalination and Water Treatment, 1-11 (2015)
Utilization of alum sludge for producing aluminum hydroxide and layered double hydroxide.
Wang LY, et al.
Ceramics International, 40(10), 15503-15514 (2014)
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Questions

1–3 of 3 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

      Helpful?

  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

  3. What is the solubility of aluminum hydroxide product 239186 (CAS 21645-51-2)?

    1 answer

    1. The product is insoluble in water but is soluble in alkaline aqueous solution, HCl, and H2SO4 solution.

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