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Calcium hydroxide

CAS Registry Number (CASRN):

1305-62-0 ,

Units of original limits:

mg/m3 ,

Conc dep:

Y ,


Calcium hydroxide ,


CaH2O2 ,

CAS Registry Number (CASRN):

1305-62-0 ,

SAX Number:

CAT225 ,

Units of original limits:

mg/m3 ,

Conc dep:

Y ,

p to m:

3.02857 ,


2 ,

specific gravity:

2.343 ,

state at 25 °C:

S ,

Molar mass (g/mol):

74.1 ,


Calcium hydroxide|Lime

The Difference between Hydrated Lime & Quicklime

Production of lime is one of humankind's oldest chemical transformations, with roots going back before recorded history. There are two kinds of lime, quicklime and hydrated lime, which differ in their chemical composition and uses. Solid bars of quicklime were once heated in theatrical spotlights to produce an intense white light called the limelight. Hydrated lime once was used in outhouses to sanitize and kill odors. Today, both forms of lime are essential materials in industry, agriculture and construction.

Making lime

Lime is a manufactured alkaline product created from limestone, or calcium carbonate. Limestone is crushed and fed into a huge rotary kiln. It is heated to about 2,000 degrees Fahrenheit by natural gas and combustion air to form lime by a process of controlled burning called calcination in which carbon in the limestone is driven off.

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