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239232

Sigma-Aldrich

Calcium hydroxide

ACS reagent, ≥95.0%

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About This Item

Formule linéaire :
Ca(OH)2
Numéro CAS:
1305-62-0
Poids moléculaire :
74.09
Numéro CE :
215-137-3
Numéro MDL:
MFCD00010901
Code UNSPSC :
12352305
ID de substance PubChem :
329752521
Nomenclature NACRES :
NB.24

Qualité

ACS reagent

Pureté

≥95.0%

Forme

powder

Impuretés

≤0.03% insol. in HCl
≤0.1% S compounds
≤3.0% calcium carbonate

pH

12.4-12.6 (20 °C)

Densité

2.24 g/mL at 25 °C (lit.)

Traces d'anions

chloride (Cl-): ≤0.03%

Traces de cations

Fe: ≤0.05%
K: ≤0.05%
Mg: ≤0.5%
Na: ≤0.05%
Sr: ≤0.05%
heavy metals: ≤0.003% (by ICP)

Chaîne SMILES 

O[Ca]O

InChI

1S/Ca.2H2O/h;2*1H2/q+2;;/p-2

Clé InChI

AXCZMVOFGPJBDE-UHFFFAOYSA-L

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Description générale

Calcium hydroxide is commonly used in wastewater treatment plants (WWTPs) to adjust pH. Calcium hydroxide has numerous applications due to its strong basic characteristics. Uses include flocculants in water and sewage treatment, a whitewash ingredient, soil improvement, as a lye substitute in non-lye hair relaxers, and in the liming industry to neutralize the acid.

Application

Calcium hydroxide can be used:
  • In the pretreatment of technical lignin during the pyrolysis in a fluidized bed reactor to overcome the agglomeration to produce phenolic-rich bio-oil.
  • As a catalyst in the pyrolysis of pinewood in a fixed bed reactor.

Pictogrammes

CorrosionExclamation mark
GHS05,GHS07

Mention d'avertissement

Danger

Mentions de danger

H315,H318,H335

Classification des risques

Eye Dam. 1 - Skin Irrit. 2 - STOT SE 3

Organes cibles

Respiratory system

Code de la classe de stockage

13 - Non Combustible Solids

Classe de danger pour l'eau (WGK)

WGK 1

Point d'éclair (°F)

Not applicable

Point d'éclair (°C)

Not applicable

Certificats d'analyse (COA)

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The antibacterial effect of camphorated paramonochlorophenol, camphorated phenol and calcium hydroxide in the treatment of infected root canals.
A Bystrom et al.
Endodontics & dental traumatology, 1(5), 170-175 (1985-10-01)
U Schröder
Journal of dental research, 64 Spec No, 541-548 (1985-04-01)
The findings from the recent literature on pulpal cell responses to the application of calcium hydroxide to exposed pulps are described. The effect of calcium hydroxide on healthy and inflamed pulp is discussed. The effect of incorporation of calcium hydroxide
Nikte Gómez-Ortíz et al.
ACS applied materials & interfaces, 5(5), 1556-1565 (2013-01-26)
The presence and deteriorating action of microbial biofilms on historic stone buildings have received considerable attention in the past few years. Among microorganisms, fungi are one of the most damaging groups. In the present work, antimicrobial surfaces were prepared using
Lisbet Mailin López González et al.
Bioresource technology, 131, 250-257 (2013-01-29)
Different pre-treatment severities by thermo-alkaline conditions (100°C, Ca(OH)2) on press mud were evaluated for different pre-treatment time and lime loading. COD solubilization and the methane yield enhancement were assessed. The biochemical methane potential was determined in batch assays under mesophilic
P Sangwan et al.
International endodontic journal, 46(1), 3-19 (2012-08-15)
Calcium hydroxide has been used extensively in dentistry for a century. Despite its widespread use as a pulp-capping agent, its mechanisms of action still remain ambiguous. Understanding its modes of action will lead to a broader understanding of the mechanisms
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