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Limestone																				Related Pages
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

FormulaCaCO3
	Conversion
	IDLH
			N.D.See: IDLH INDEX

Exposure Limits
			NIOSH RELTWA 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 Weight100.1	
	Boiling PointDecomposes
	Melting Point1517-2442°F (Decomposes)
	Solubility0.001%
	Vapor Pressure0 mmHg (approx)
	Ionization PotentialNA											
Specific Gravity2.7-2.9	
	Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
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 NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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