Limestone
Synonyms & Trade Names Calcium carbonate, Natural calcium carbonate [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 0600
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
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

Limestone