NIOSH Pocket Guide to Chemical Hazards

Limestone CAS 1317-65-3
CaCO3 RTECS EV9580000
Synonyms & Trade Names
Calcium carbonate, Natural calcium carbonate [Note: Calcite & aragonite are commercially important natural calcium carbonates.]
DOT ID & Guide
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)
IDLH N.D. Conversion
Physical Description
Odorless, white to tan powder.
MW: 100.1
BP: Decomposes
MLT: 1517-2442°F (Decomposes)
Sol: 0.001%
VP: 0 mmHg (approx)
IP: NA

Sp.Gr: 2.7-2.9
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Solid
Incompatibilities & Reactivities
Fluorine, magnesium, acids, alum, ammonium salts
Measurement Methods
NIOSH 0500, 0600
Personal Protection & Sanitation
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 To be added later
Exposure Routes inhalation, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; cough, sneezing, rhinorrhea (discharge of thin mucus); lacrimation (discharge of tears)
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION