Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. The broadly used term “lime” connotes calcium-containing inorganic materials, in which carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate. By contrast, quicklime specifically applies to the single chemical compound calcium oxide. Calcium oxide that survives processing without reacting in building products such as cement is called free lime.


In B.O.S. (basic oxygen steelmaking) process
In production of aerated concrete blocks
In making of cement
In paper industry
In mining industry

Minimum Assay: >92%
Molecualr Formula: CaO
Molecular Weight: 56.08 g/mol
Melting Point: 2850°C
Density at 25°C (g/cm3): 3.3
Calcium Carbonate: <1.34%
Magnesium Oxide: <0.50%
Iron Oxide: <0.06%
Aluminium Oxide: <0.10%
Silicon Dioxide: <0.90%
Arsenic (As): <1.5ppm
Carbon Dioxide: <0.80%
Fluorine (F): <77ppm
lead (Pb): <3.1ppm
Manganese (Mn): <192ppm
Loss on ignition: <1.20%
Moisture: <0.40%
Sulphur (S): <0.025%

% passing 22.4mm: 100%
% passing 16mm: 99.0%
% passing 6.3mm: 13.0%
% passing 2.0m: 1%

BS6463 Reactivity (2 min): 68.0 deg C
BS6463 Reactivity (5 min): 69.0 deg C

Cas Number: 1305-78-8

Einecs Number: 215-138-9

HS Code / Commodity Code: 2825901900

UN Number: 1910

Hazard Class: 8

Hazard Phrases: H315,H318,H335

Prec Phrases: P261,P280a,P305+P351+P338,P304+P340,P405,P501a