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Calcium hydroxide																				Related Pages
Synonyms & Trade Names
			Calcium hydrate, Caustic lime, Hydrated lime, Slaked lime
CAS No.
			1305-62-0
	RTECS No.
			EW2800000
	DOT ID & Guide

FormulaCa(OH)2
	Conversion
	IDLH
			N.D.See: IDLH INDEX

Exposure Limits
			NIOSH RELTWA 5 mg/m3OSHA PEL TWA 15 mg/m3 (total) 5 mg/m3 (resp)
	Measurement Methods
			**NIOSH** 7020;**OSHA** ID121
					
					See: NMAM or OSHA Methods
										
Physical Description
			White, odorless powder.
					[Note: Readily absorbs CO2 from the air to form calcium carbonate.]													
										
Molecular Weight74.1	
	Boiling PointDecomposes
	Melting Point1076°F (Decomposes) (Loses H2O)
	Solubility(32°F): 0.2%
	Vapor Pressure0 mmHg (approx)
	Ionization PotentialNA											
Specific Gravity2.24	
	Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
Noncombustible Solid
Incompatibilities & Reactivities
			Maleic anhydride, phosphorus, nitroethane, nitromethane, nitroparaffins, nitropropane
					[Note: Attacks some metals.]
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, upper respiratory system; eye, skin burns; skin vesiculation; cough, bronchitis, pneumonitis
Target Organs
			Eyes, skin, respiratory system
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated/Daily
							**Remove:**When wet or contaminated
							**Change:**Daily
							**Provide:**Eyewash, Quick drench
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap flush immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			Not available.
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0408

			
							

			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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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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