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239232

Sigma-Aldrich

Calcium hydroxide

ACS reagent, ≥95.0%

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Linear Formula:
Ca(OH)2
CAS Number:
Molecular Weight:
74.09
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NB.24

grade

ACS reagent

Quality Level

Assay

≥95.0%

form

powder

impurities

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

pH

12.4-12.6 (20 °C)

density

2.24 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤0.03%

cation traces

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

SMILES string

O[Ca]O

InChI

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

InChI key

AXCZMVOFGPJBDE-UHFFFAOYSA-L

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This Item
4501461.021191.02047
Calcium hydroxide ACS reagent, ≥95.0%

Sigma-Aldrich

239232

Calcium hydroxide

Essential Grade
Calcium hydroxide 99.995% trace metals basis

Sigma-Aldrich

450146

Calcium hydroxide

-
Calcium hydroxide precipitated (≤ 0.0005% Al), EMPROVE® ESSENTIAL, USP, FCC, E 526

SAFC

1.02119

Calcium hydroxide

-
Calcium hydroxide for analysis EMSURE® ACS,Reag. Ph Eur

Supelco

1.02047

Calcium hydroxide

-
assay

≥95.0%

assay

99.995% trace metals basis

assay

-

assay

≥96.0% (acidimetric)

form

powder

form

powder

form

solid

form

solid

impurities

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

impurities

<3% calcium carbonate

impurities

-

impurities

≤0.03% Substances insoluble in hydrochloric acid

pH

12.4-12.6 (20 °C)

pH

-

pH

12.6 (20 °C in H2O, saturated solution)

pH

12.6 (20 °C in H2O, saturated solution)

density

2.24 g/mL at 25 °C (lit.)

density

2.24 g/mL at 25 °C (lit.)

density

2.24 g/cm3 at 20 °C

density

2.24 g/cm3 at 20 °C

General description

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.

Pictograms

CorrosionExclamation mark

Signal Word

Danger

Hazard Statements

Hazard Classifications

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

Target Organs

Respiratory system

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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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
T J Hilton et al.
Journal of dental research, 92(7 Suppl), 16S-22S (2013-05-22)
This practice-based, randomized clinical trial evaluated and compared the success of direct pulp capping in permanent teeth with MTA (mineral trioxide aggregate) or CaOH (calcium hydroxide). Thirty-five practices in Northwest PRECEDENT were randomized to perform direct pulp caps with either
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
L R Fava et al.
International endodontic journal, 32(4), 257-282 (1999-11-07)
REVIEW ARTICLE: Calcium hydroxide has been used in endodontology for many years. The aim of this paper is to review the various formulations of calcium hydroxide that have been described, with specific reference to the vehicle used to carry the

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