Characteristics of quicklime and hydrated lime
Link to this table

Parameter Quicklime Hydrated lime
Formula CaO Ca(OH)2
Molecular weight 56.1 74.1
Physical state White solid White solid
Particulate size Pulverized to lump Powder, 200 to 400 mesh
Bulk density (lb/ft3) 55 to 75 35 to 50
Specific gravity (g/cm3) 3.2 to 3.4 2.3 to 2.4
Affinity for water Reacts quickly to for Ca(OH)2 with heat of formation, 490 Btu/lb Absorbs H2O and CO2 from air to form CaCO3
Solubility Slightly, varies inversely with temperature Slightly, varies inversely with temperature
Stability in bagged storage In multiwalled bags, max 60 days Up to 6 months, in dry tight bags
pH of saturated solution 12.4 12.4

This page was last edited on 2 August 2022, at 17:10.