Calcium Hydroxide


💊 Chemical information

Calcii hydroxidum; Calcium Hydrate; Calcium, hydroxyde de; E526; Hidróxido cálcico; Hydroxid vápenatý; Kalcio hidroksidas; Kalcium-hidroxid; Kalciumhydroxid; Kalsiumhydroksidi; Slaked Lime; Wapnia wodorotlenek.
Chemical formula: Ca(OH)2 = 74.09.
CAS — 1305-62-0.


In Eur., Jpn, US, and Viet.

Ph. Eur. 6.2

(Calcium Hydroxide). A fine white or almost white powder. Practically insoluble in water.

USP 31

(Calcium Hydroxide). A white powder with a slightly bitter alkaline taste. Soluble 1 in 630 of water and 1 in 1300 of boiling water; insoluble in alcohol; soluble in glycerol and in syrup. Store in airtight containers.

💊 Profile

Calcium hydroxide is a weak alkali. It is used in the form of Calcium Hydroxide Solution (lime water) in some skin lotions and oily preparations to form calcium soaps of fatty acids which produce water-in-oil emulsions. Calcium hydroxide pastes are used in dentistry. A paste made from a mixture of calcium hydroxide and potassium hydroxide and known as Vienna paste was used as an escharotic. Soda lime is a mixture of calcium hydroxide and potassium hydroxide and/or sodium hydroxide. With sulfur, calcium hydroxide forms sulfurated lime solution.


Calcium hydroxide has been used in homoeopathic medicines under the following names: Calcarea caustica; Cal. caus.

Adverse effects.

A report of ocular alkali burns in children, leading to severe visual loss, caused by packets of calcium hydroxide (‘Chuna’) popularly consumed in India as an additive to chewing tobacco.1 For the use of sodium edetate in the treatment of calcium hydroxide burns of the eye.
1. Agarwal T, Vajpayee RB. A warning about the dangers of chuna packets. Lancet 2003; 361: 2247.

💊 Preparations

BP 2008: Calcium Hydroxide Solution; USP 31: Calcium Hydroxide Topical Solution.

Proprietary Preparations

Ger.: Dermi-cyl; Mex.: Oleoderm. Multi-ingredient: Cz.: Aviril H†; Mex.: Caliderm; Liniderm; Oleoderm Plus; Pol.: Acne Sulf; Spain: Cremsol; Switz.: Sansilla.
Published February 02, 2019.