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Registry of Toxic Effects of Chemical Substances (RTECS)

Calcium hydroxide

RTECS #

EW2800000

CAS #

1305-62-0

Updated

September 201

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

Skin and Eye Irritation and References

Route/OrganismDoseEffectReference
eye /rabbit 10 mg severeTXAPA9 55,501,1980

Mutation Data and Reference

System TestRoute/Organism/TissueDoseReference
Cytogenetic AnalysisAscites tumor/rat1200 mg/kgGANNA2 54,155,1963

Acute Toxicity Data and References

Route/OrganismDoseEffectReference
oral/mouse lethal dose (50 percent kill): 7300 mg/kgYKYUA6 32,1477,1981
oral/rat lethal dose (50 percent kill): 7340 mg/kgAIHAAP 30,470,1969

Reviews

OrganizationStandardReference
American Conference of Governmental Industrial Hygienists (ACGIH)Threshold Limit Value-time-weighted average 5 mg/m3DTLVS* TLV/BEI,2013
TOXICOLOGY REVIEWIMEMDT 85,39,2004
TOXICOLOGY REVIEWMUTAEX 19,251,2004
TOXICOLOGY REVIEWCHHSA* 9,6,2002

Standards and Regulations

OrganizationStandardReference
Environmental Protection Agency (EPA) Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) 1988 PESTICIDE SUBJECT TO REGISTRATION OR RE-REGISTRATIONFEREAC 54,7740,1989
Environmental Protection Agency (EPA) Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) 1998 STATUS OF PESTICIDESCancelledRBREV* -,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-AUSTRALIAtime-weighted average 5 mg/m3, JUL2008
Occupational Exposure Limit-AUSTRIAMAK-TMW 2 mg/m3;KZW 4 mg/m3, inhal, 2007
Occupational Exposure Limit-BELGIUMtime-weighted average 5 mg/m3, MAR2002
Occupational Exposure Limit-DENMARKtime-weighted average 5 mg/m3, MAY2011
Occupational Exposure Limit-FINLANDtime-weighted average 5 mg/m3, NOV2011
Occupational Exposure Limit-FRANCEVME 5 mg/m3, FEB2006
Occupational Exposure Limit-HUNGARYtime-weighted average 5 mg/m3, SEP2000
Occupational Exposure Limit-ICELANDtime-weighted average 5 mg/m3, NOV2011
Occupational Exposure Limit-KOREAtime-weighted average 5 mg/m3, 2006
Occupational Exposure Limit-MEXICOtime-weighted average 5 mg/m3, 2004
Occupational Exposure Limit-NEW ZEALANDtime-weighted average 5 mg/m3, JAN2002
Occupational Exposure Limit-NORWAYtime-weighted average 5 mg/m3, JAN1999
Occupational Exposure Limit-PERUtime-weighted average 5 mg/m3, JUL2005
Occupational Exposure Limit-POLANDMAC(time-weighted average) 2 mg/m3, JAN1999
Occupational Exposure Limit-RUSSIAshort term exposure limit 2 mg/m3, Skin, JUN2003
Occupational Exposure Limit-SWEDENtime-weighted average 3 mg/m3;short term exposure limit 6 mg/m3 (inhalable dust), JUN2005
Occupational Exposure Limit-SWITZERLANDMAK-week 5 mg/m3, inhal, JAN2011
Occupational Exposure Limit-THE NETHERLANDSMAC-TGG 5 mg/m3, 2003
Occupational Exposure Limit-UNITED KINGDOMtime-weighted average 5 mg/m3, OCT2007
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction)8H time-weighted average 15 mg/m3, total dustCFRGBR 29,1926.55,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction)8H time-weighted average 5 mg/m3, respirable fractionCFRGBR 29,1926.55,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry)8H time-weighted average 15 mg/m3, total dustCFRGBR 29,1910.1000,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry)8H time-weighted average 5 mg/m3, respirable fractionCFRGBR 29,1910.1000,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards)8H time-weighted average 15 mg/m3, total dustCFRGBR 29,1915.1000,1993
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards)8H time-weighted average 5 mg/m3, respirable fractionCFRGBR 29,1915.1000,1993

NIOSH Documentation and Surveillance

OrganizationStandardReference
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Level TO CALCIUM HYDROXIDE-air10H time-weighted average 5 mg/m3NIOSH* DHHS #95-121,1995
National Occupational Exposure Survey 1983Hazard 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 1974Hazard 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

OrganizationReference
EPA TSCA Section 8(b) CHEMICAL INVENTORY
NIOSH Analytical Method, 1994: Calcium and compounds, 7020

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