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Limestone

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Synonyms & Trade Names
Calcium carbonate [Limestone], Natural calcium carbonate [Limestone] [Note: Calcite & aragonite are commercially important natural calcium carbonates.]
CAS No.
1317-65-3
RTECS No.
EV9580000
DOT ID & Guide
Formula
CaCO₃
Conversion
IDLH
N.D.
See: IDLH INDEX
Exposure Limits
NIOSH REL
TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
OSHA PEL
TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
Measurement Methods
NIOSH 0500 , 0600
See: NMAM or OSHA Methods
Physical Description
Odorless, white to tan powder.
Molecular Weight
100.1
Boiling Point
Decomposes
Melting Point
1517-2442°F (Decomposes)
Solubility
0.001%
Vapor Pressure
0 mmHg (approx)
Ionization Potential
NA
Specific Gravity
2.7-2.9
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Noncombustible Solid
Incompatibilities & Reactivities
Fluorine, magnesium, acids, alum, ammonium salts
Exposure Routes
inhalation, skin and/or eye contact
Symptoms
irritation eyes, skin, mucous membrane; cough, sneezing, rhinorrhea (discharge of thin nasal mucus); lacrimation (discharge of tears)
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin:No recommendation
Eyes:No recommendation
Wash skin:No recommendation
Remove:No recommendation
Change:No recommendation
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash
Breathing:Fresh air
Respirator Recommendations

Not available.

Important additional information about respirator selection

See also
INTRODUCTION
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health