Calcium Hydroxide

Specifications & Grades of Commercial Pure Hydrated Lime or Slaked Lime or Calcium Hydroxide:

Grades	A1++	A1+
% of available lime as Ca(OH)2	96±1	+94
Active CaO(%)	+72.5	+71
Acid insolubles (max.)%	0.1	0.2
Iron	150 PPM	200 PPM
Alumina	In traces	In traces
Magnesia as MgO (max.)%	0.5	0.55
Mesh (BSS)	500	400

We also offer synthetic Calcium Hydroxide good for precise applications like Aramid Fiber.

Calcium Hydroxide BP British Pharmacopoeia

Calcium Hydroxide BP Ca(OH)2
Ca(OH)2 -- 74.1

Preparation
Calcium Hydroxide Solution

DEFINITION
Content
95.0 per cent to 100.5 per cent.

CHARACTERS
Appearance
White or almost white, fine powder.
Solubility
Practically insoluble in water.

IDENTIFICATION
A. To 0.80 g in a mortar, add 10 ml of water R and 0.5 ml of phenolphthalein solution and mix. The suspension turns red. On addition of 17.5 ml of 1 M hydrochloric acid , the suspension becomes colourless without effervescing. The red colour occurs again when the mixture is triturated for 1 min. On addition of a further 6 ml of 1 M hydrochloric acid and triturating, the solution becomes colourless.
B. Dissolve about 0.1 g in dilute hydrochloric acid and dilute to 10 ml with water . 5 ml of the solution give reaction of calcium.

TESTS
Matter insoluble in hydrochloric acid
Maximum 0.5 per cent.
Dissolve 2.0 g in 30 ml of hydrochloric acid. Boil the solution and filter. Wash the residue with hot water. The residue weighs a maximum of 10 mg.
Carbonates
Maximum 5.0 per cent of CaCO3.
Chlorides
Maximum 330 ppm.
Sulphates
Maximum 0.4 per cent.
Arsenic
Maximum 4 ppm.
Magnesium and alkali metals
Maximum 4.0 per cent calculated as sulphates.
Heavy metals
Maximum 20 ppm.

ASSAY
To 1.500 g in a mortar, add 20-30 ml of water R and 0.5 ml of phenolphthalein solution. Titrate with 1 M hydrochloric acid by triturating the substance until the red colour disappears. The final solution is used in the tests for carbonates.
1 ml of 1 M hydrochloric acid is equivalent to 37.05 mg of Ca(OH)2.

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Calcium Hydroxide USP Ca(OH)2
Calcium Hydroxide; Lime
Ca(OH)2 -- 74.09
Calcium hydroxide CAS 1305-62-0
Calcium Hydroxide contains not less than 95.0 percent and not more than 100.5 percent of Ca(OH)2.
Packaging and storage- Preserve in tight containers.

Identification
A: When mixed with from three to four times its weight of water, it forms a smooth magma. The clear, supernatant from the magma is alkaline to litmus.
B: Mix 1 g with 20 mL of water, and add sufficient 6 N acetic acid to effect solution: the resulting solution responds to the tests for Calcium.
Limit of acid-insoluble substances— Dissolve 2.0 g in 30 mL of 4 N hydrochloric acid, and heat to boiling. Filter the mixture, wash the residue with hot water, and ignite: the weight of the residue does not exceed 10 mg (0.5%).
Carbonate— Mix 2 g with 50 mL of water: the addition of an excess of 3 N hydrochloric acid to the mixture does not cause more than a slight effervescence.
Heavy metals— Dissolve 2.0 g in 20 mL of 3 N hydrochloric acid, and evaporate on a steam bath to dryness. Dissolve the residue in 20 mL of water, and filter. Dilute the filtrate with water to 40 mL, and to 20 mL of the resulting solution add 1 mL of 0.1 N hydrochloric acid, then add water to make 25 mL: the limit is 20 6g per g.
Limit of magnesium and alkali salts— Dissolve 0.50 g in a mixture of 30 mL of water and 10 mL of 3 N hydrochloric acid, and proceed as directed in the test for Magnesium and alkali salts under Calcium Carbonate, beginning with “heat the solution, and boil for 1 minute.” The weight of the residue does not exceed 12 mg (4.8%).
Assay— Transfer about 1.5 g of Calcium Hydroxide, accurately weighed, to a beaker, and gradually add 30 mL of 3 N hydrochloric acid. When the solution is dissolved, transfer it to a 500-mL volumetric flask, rinse the beaker thoroughly, adding the rinsing to the flask, dilute with water to volume, and mix. Pipette 50 mL of the solution into a suitable container, add 100 mL of water, 15 mL of 1 N sodium hydroxide, and 300 mg of hydroxy naphthol blue, and titrate with 0.05 M edentate disodium VS to a blue endpoint. Each mL of 0.05 M edetate disodium is equivalent to 3.705 mg of Ca(OH)2.

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Calcium Hydroxide FCC Food Grade Slaked Lime
Calcium Hydroxide
Ca(OH)2 Formula weight 74.10
INS: 526 CAS 1305-62-0

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Calcium Hydroxide Hexahydrate BP Specifications:
Calcium Hydroxide BP Hexahydrate
CaCl2-6H2O

DEFINITION
Content
97.0 per cent to 103.0 per cent of CaCl2,6H2O.

CHARACTERS
Appearance
White or almost white, crystalline mass or colorless crystals.
Solubility
Very soluble in water, freely soluble in ethanol (96 per cent).
It solidifies at about 29C.

IDENTIFICATION
Solution S (see Tests) gives reaction of chlorides.
It gives the reactions of calcium.
It complies with the limits of the assay.

TESTS
Solution S
Dissolve 15.0 g in carbon dioxide-free water prepared from distilled water R and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and not more intensely colored than reference solution.
Acidity or alkalinity: To 10 ml of freshly prepared solution S add 0.1 ml of phenolphthalein solution. If the solution is red, not more than 0.2 ml of 0.01 M hydrochloric acid is required to discharge the color and if the solution is colorless, not more than 0.2 ml of 0.01 M sodium hydroxide is required to turn it red.
Sulphates: Maximum 200 ppm.
Aluminium: To 10 ml of solution S add 2 ml of ammonium chloride solution R and 1 ml of dilute ammonia R1 . Heat to boiling. No turbidity or precipitate is formed. If intended for use in the manufacture of dialysis solutions, the above test is replaced by the test for Aluminium : maximum 1 ppm.
Barium: To 10 ml of solution S add 1 ml of calcium Sulphate solution. After at least 15 min, any opalescence in the solution is not more intense than that in a mixture of 1 ml of distilled water and 10 ml of solution S.
Iron: Maximum 7 ppm, determined on solution S.
Magnesium and alkali metals: Maximum 0.3 per cent.
Heavy metals Maximum 15 ppm.

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Calcium Hydroxide Injection as per USP Specifications
Calcium Hydroxide
Calcium Hydroxide Injection is a sterile solution of Calcium Hydroxide in Water for Injection. It contains not less than 95.0 percent and not more than 105.0 percent of the labeled amount of CaCl2·2H2O.
Packaging and storage— Preserve in single-dose containers, preferably of Type I glass.
Identification— It responds to the tests for Calcium and Chloride.
Bacterial end toxins— It contains not more than 0.2 USP End toxin Unit per mg of calcium chloride.
pH: between 5.5 and 7.5 in the undiluted Injection, except where the concentration is greater than 1 in 20, in which case this range applies to the Injection diluted with water to yield a concentration of 1 in 20.
Particulate matter: meets the requirements for small-volume injections.
Other requirements— It meets the requirements under Injections 1.

Calcium Hydroxide FCC US Food Chemical Codex
CaCl2 Formula wt, anhydrous 110.98
CaCl2·2H2O Formula weight, dihydrate 147.01
Calcium Hydroxide

DESCRIPTION
Calcium Hydroxide occurs as white, hard fragments, granules, or powder. It is anhydrous or contains two molecules of water of hydration. It is deliquescent. It is soluble in water and slightly soluble in alcohol. The pH of a 1:20 aqueous solution is between 4.5 and 11.0. Function Firming agent.

REQUIREMENTS
Labeling: Indicate whether it is anhydrous or the dihydrate.
Identification: A 1:10 aqueous solution gives positive tests for Calcium and for Chloride.
Assay: Anhydrous: Not less than 93.0% and not more than 100.5% of CaCl2; Dihydrate: Not less than 99.0% and not more than 107.0% of CaCl2·2H2O.
Acid-Insoluble Matter Anhydrous: Not more than 0.02%; no particles per kilogram of sample greater than 2 mm in any dimension.
Arsenic: Not more than 3 mg/kg.
Fluoride: Not more than 0.004%.
Lead: Not more than 5 mg/kg.
Magnesium and Alkali Salts Anhydrous: Not more than 5.0%; Dihydrate: Not more than 4.0%.

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Calcium Hydroxide Solution FCC Food Grade
Calcium Hydroxide

DESCRIPTION
Calcium Hydroxide Solution occurs as a clear to slightly turbid, colorless or slightly colored liquid at room temperature. It is normally available in a concentration range of about 35% to 45% of CaCl2.
Function: Sequestrant; firming agent.

REQUIREMENTS
Identification: When diluted to a concentration of about 1:10 (CaCl2 basis), a sample gives positive tests for Calcium and for Chloride.
Assay: Not less than 90.0% and not more than 110.0%, by weight, of the labeled amount of calcium chloride, expressed as CaCl2.
Alkalinity [as Ca(OH)2]: Not more than 0.3%.
Fluoride: Not more than 0.004%, calculated on the amount of CaCl2 as determined in the Assay.
Lead: Not more than 4 mg/kg, calculated on the amount of CaCl2 as determined in the Assay.
Magnesium and Alkali Salts: Not more than 5.0%, calculated on the amount of Calcium Hydroxide as determined in the Assay.

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Calcium Hydroxide Dihydrate Analytical Reagent
CaCl2-2H2O
Formula Weight 147.01
CAS Number 10035-04-8
Calcium Hydroxide

REQUIREMENTS
Assay: 99.0-105.0% CaCl2 - 2H2O
pH of a 5% solution: 4.5-8.5 at 25C

MAXIMUM ALLOWABLE
Insoluble matter: 0.01%
Oxidizing substances (as NO3): 0.003%
Sulfate (SO4): 0.01%
Ammonium (NH4): 0.005%
Barium (Ba): 0.005%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 0.001%
Magnesium (Mg): 0.005%
Potassium (K): 0.01%
Sodium (Na): 0.02%
Strontium (Sr): 0.1%

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Certifications :
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