Calcium hydroxide
RTECS #
EW2800000
CAS #
Updated
October 2017
Molecular Weight
74.10
Molecular Formula
CaH2O2
Synonyms
Bell mine
Biocalc
Calcium dihydroxide
Calcium hydrate
Calcium hydroxide (ACGIH:OSHA)
Calvit
Carboxide
Hydrated lime
Kalkhydrate
Kemikal
Limbux
Lime milk
Lime water
Milk of lime
Slaked lime
Biocalc
Calcium dihydroxide
Calcium hydrate
Calcium hydroxide (ACGIH:OSHA)
Calvit
Carboxide
Hydrated lime
Kalkhydrate
Kemikal
Limbux
Lime milk
Lime water
Milk of lime
Slaked lime
Skin and Eye Irritation and References
| Route/Organism | Dose | Effect | Reference |
|---|---|---|---|
| eye /rabbit | 10 mg | severe | TXAPA9 55,501,1980 |
Mutation Data and Reference
| System Test | Route/Organism/Tissue | Dose | Reference |
|---|---|---|---|
| Cytogenetic Analysis | Ascites tumor/rat | 1200 mg/kg | GANNA2 54,155,1963 |
Acute Toxicity Data and References
| Route/Organism | Dose | Effect | Reference |
|---|---|---|---|
| oral/mouse | lethal dose (50 percent kill): 7300 mg/kg | YKYUA6 32,1477,1981 | |
| oral/rat | lethal dose (50 percent kill): 7340 mg/kg | AIHAAP 30,470,1969 |
Reviews
| Organization | Standard | Reference |
|---|---|---|
| American Conference of Governmental Industrial Hygienists (ACGIH) | Threshold Limit Value-time-weighted average 5 mg/m3 | DTLVS* TLV/BEI,2013 |
| TOXICOLOGY REVIEW | IMEMDT 85,39,2004 | |
| TOXICOLOGY REVIEW | MUTAEX 19,251,2004 | |
| TOXICOLOGY REVIEW | CHHSA* 9,6,2002 | |
| TOXICOLOGY REVIEW | AJIMD8 345681998 |
Standards and Regulations
| Organization | Standard | Reference |
|---|---|---|
| Environmental Protection Agency (EPA) Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) 1988 PESTICIDE SUBJECT TO REGISTRATION OR RE-REGISTRATION | FEREAC 54,7740,1989 | |
| Environmental Protection Agency (EPA) Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) 1998 STATUS OF PESTICIDES | Cancelled | RBREV* -,326,1998 |
| Occupational Exposure Limit IN ARGENTINA, BULGARIA, COLOMBIA, JORDAN check ACGIH TLV; | ||
| Occupational Exposure Limit IN SINGAPORE, VIETNAM check ACGIH TLV | ||
| Occupational Exposure Limit-AUSTRALIA | time-weighted average 5 mg/m3, JUL2008 | |
| Occupational Exposure Limit-AUSTRIA | MAK-TMW 2 mg/m3;KZW 4 mg/m3, inhal, 2007 | |
| Occupational Exposure Limit-BELGIUM | time-weighted average 5 mg/m3, MAR2002 | |
| Occupational Exposure Limit-DENMARK | time-weighted average 5 mg/m3, MAY2011 | |
| Occupational Exposure Limit-FINLAND | time-weighted average 5 mg/m3, NOV2011 | |
| Occupational Exposure Limit-FRANCE | VME 5 mg/m3, FEB2006 | |
| Occupational Exposure Limit-HUNGARY | time-weighted average 5 mg/m3, SEP2000 | |
| Occupational Exposure Limit-ICELAND | time-weighted average 5 mg/m3, NOV2011 | |
| Occupational Exposure Limit-KOREA | time-weighted average 5 mg/m3, 2006 | |
| Occupational Exposure Limit-MEXICO | time-weighted average 5 mg/m3, 2004 | |
| Occupational Exposure Limit-NEW ZEALAND | time-weighted average 5 mg/m3, JAN2002 | |
| Occupational Exposure Limit-NORWAY | time-weighted average 5 mg/m3, JAN1999 | |
| Occupational Exposure Limit-PERU | time-weighted average 5 mg/m3, JUL2005 | |
| Occupational Exposure Limit-POLAND | MAC(time-weighted average) 2 mg/m3, JAN1999 | |
| Occupational Exposure Limit-RUSSIA | short term exposure limit 2 mg/m3, Skin, JUN2003 | |
| Occupational Exposure Limit-SWEDEN | time-weighted average 3 mg/m3;short term exposure limit 6 mg/m3 (inhalable dust), JUN2005 | |
| Occupational Exposure Limit-SWITZERLAND | MAK-week 5 mg/m3, inhal, JAN2011 | |
| Occupational Exposure Limit-THE NETHERLANDS | MAC-TGG 5 mg/m3, 2003 | |
| Occupational Exposure Limit-UNITED KINGDOM | time-weighted average 5 mg/m3, OCT2007 | |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction) | 8H time-weighted average 15 mg/m3, total dust | CFRGBR 29,1926.55,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction) | 8H time-weighted average 5 mg/m3, respirable fraction | CFRGBR 29,1926.55,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry) | 8H time-weighted average 15 mg/m3, total dust | CFRGBR 29,1910.1000,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry) | 8H time-weighted average 5 mg/m3, respirable fraction | CFRGBR 29,1910.1000,1994 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards) | 8H time-weighted average 15 mg/m3, total dust | CFRGBR 29,1915.1000,1993 |
| Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards) | 8H time-weighted average 5 mg/m3, respirable fraction | CFRGBR 29,1915.1000,1993 |
NIOSH Documentation and Surveillance
| Organization | Standard | Reference |
|---|---|---|
| National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Level TO CALCIUM HYDROXIDE-air | 10H time-weighted average 5 mg/m3 | NIOSH* DHHS #95-121,1995 |
| National Occupational Exposure Survey 1983 | Hazard Code 15743; Number of Industries 167; Total Number of Facilities 20988; Number of Occupations 131; Total Number of Employees Exposed 360007; Total Number of Female Employees Exposed 39330 | |
| National Occupational Hazard Survey 1974 | Hazard Code 15743; Number of Industries 187; Total Number of Facilities 15315; Number of Occupations 115; Total Number of Employees Exposed 226292 |
Status in Federal Agencies
| Organization | Reference |
|---|---|
| EPA TSCA Section 8(b) CHEMICAL INVENTORY | |
| NIOSH Analytical Method, 1994: Calcium and compounds, 7020 |
Page last reviewed: November 16, 2018
Content
source: National Institute for Occupational Safety and Health