Calcium Hydroxide

Calcium Hydroxide is an inorganic compound with the chemical formula Ca(OH)2. It is a colorless crystal or white powder; when calcium oxide (called lime or quicklime) is slaked with water it reacts to Calcium Hydroxide in an exothermic reaction. It can also be created by mixing an aqueous solution of calcium chloride and an aqueous solution of sodium hydroxide.

An alternative name for Calcium Hydroxide is caustic lime, or Hydrated Lime. If heated, Calcium Hydroxide decomposes into calcium oxide and water.


Because of its low toxicity and mild basic properties, Calcium Hydroxide has various uses, such as:

As reagent

  • in the tanning industry for neutralization of extra acid,
  • in the petroleum refining industry for the manufacture of additives to oils,
  • in water/sewage treatment as flocculant,
  • in the chemical industry for manufacture of calcium stearate,
  • in the food industry for processing water (for alcoholic and soft drinks) and
  • for clearing a brine of carbonates of calcium and magnesium in the manufacture of salt for food and pharmacopoeia.

As filler

  • in the petrochemical industry for manufacturing solid oil of various types,
  • in the production of brake pads,
  • in the manufacture of ebonite,
  • for preparation of dry mixes for painting and decorating,
  • in manufacturing mixes for pesticides, and as
  • a dressing in paste form used for anti-microbial effect during a dental root canal procedure.