NIOSH logo and tagline

Calcium oxide

Related Pages
RTECS #
EW3100000
CAS #
1305-78-8
See: NMAM or OSHA Methods
Updated
September 2013
Molecular Weight
56.08
Molecular Formula
CaO
Synonyms
Airlock
BELL cml(E)
Burnt lime
Calcia
Calcium oxide (ACGIH:OSHA)
Caloxol CP2
Caloxol W3
CALX
Calxyl
CML 21
CML 31
Desical P
Lime
Lime, burned
Oxyde de calcium (French)
Quicklime
Rhenosorb C
Rhenosorb F
Wapniowy tlenek (Polish)

Acute Toxicity Data and References

Route/OrganismDoseEffectReference
intraperitoneal/mouse lethal dose (50 percent kill): 3059 mg/kgVCVN1* -,115,1988

Reviews

OrganizationStandardReference
American Conference of Governmental Industrial Hygienists (ACGIH)Threshold Limit Value-time-weighted average 2 mg/m3DTLVS* TLV/BEI,2013
TOXICOLOGY REVIEWCHHSA* 9,6,2002
TOXICOLOGY REVIEWTIHEEC 18,321,2002

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* -,325,1998
Mine Safety and Health Administration (MSHA) STANDARD-airtime-weighted average 3 mg/m3DTLVS* 3,36,1971
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 2 mg/m3, JUL2008
Occupational Exposure Limit-AUSTRIAMAK-TMW 2 mg/m3;KZW 4 mg/m3, inhal, 2007
Occupational Exposure Limit-BELGIUMtime-weighted average 2 mg/m3, MAR2002
Occupational Exposure Limit-DENMARKtime-weighted average 2 mg/m3, MAY2011
Occupational Exposure Limit-FINLANDtime-weighted average 2 mg/m3, NOV2011
Occupational Exposure Limit-FRANCEVME 2 mg/m3, FEB2006
Occupational Exposure Limit-HUNGARYtime-weighted average 5 mg/m3, short term exposure limit 5 mg/m3, SEP2000
Occupational Exposure Limit-ICELANDtime-weighted average 2 mg/m3, NOV2011
Occupational Exposure Limit-INDIAtime-weighted average 2 mg/m3, JAN1993
Occupational Exposure Limit-KOREAtime-weighted average 2 mg/m3, 2006
Occupational Exposure Limit-MEXICOtime-weighted average 2 mg/m3, 2004
Occupational Exposure Limit-NEW ZEALANDtime-weighted average 2 mg/m3, JAN2002
Occupational Exposure Limit-NORWAYtime-weighted average 2 mg/m3, JAN1999
Occupational Exposure Limit-PERUtime-weighted average 2 mg/m3, JUL2005
Occupational Exposure Limit-POLANDMAC(time-weighted average) 2 mg/m3, MAC(short term exposure limit) 6 mg/m3, JAN1999
Occupational Exposure Limit-RUSSIAshort term exposure limit 1 mg/m3, Skin, JUN2003
Occupational Exposure Limit-SWEDENtime-weighted average 1 mg/m3;short term exposure limit 2.5 mg/m3, JUN2005
Occupational Exposure Limit-SWITZERLANDceiling concentration 2 mg/m3, inhal, JAN2011
Occupational Exposure Limit-THE NETHERLANDSMAC-TGG 2 mg/m3, 2003
Occupational Exposure Limit-THE PHILIPPINEStime-weighted average 5 mg/m3, JAN1993
Occupational Exposure Limit-TURKEYtime-weighted average 5 mg/m3, JAN1993
Occupational Exposure Limit-UNITED KINGDOMtime-weighted average 2 mg/m3, OCT2007
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction)8H time-weighted average 5 mg/m3CFRGBR 29,1926.55,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Federal Contractors)8H time-weighted average 5 mg/m3CFRGBR 41,50-204.50,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry)8H time-weighted average 5 mg/m3CFRGBR 29,1910.1000,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards)8H time-weighted average 5 mg/m3CFRGBR 29,1915.1000,1993

NIOSH Documentation and Surveillance

OrganizationStandardReference
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Level TO CALCIUM OXIDE-air10H time-weighted average 2 mg/m3NIOSH* DHHS #95-121,1995
National Occupational Exposure Survey 1983Hazard Code X9892; Number of Industries 1; Total Number of Facilities 9; Number of Occupations 1; Total Number of Employees Exposed 104
National Occupational Exposure Survey 1983Hazard Code 15755; Number of Industries 251; Total Number of Facilities 38096; Number of Occupations 153; Total Number of Employees Exposed 726694; Total Number of Female Employees Exposed 71548
National Occupational Hazard Survey 1974Hazard Code 15755; Number of Industries 158; Total Number of Facilities 16328; Number of Occupations 114; Total Number of Employees Exposed 284781

Status in Federal Agencies

OrganizationReference
EPA TSCA Section 8(b) CHEMICAL INVENTORY
EPA TSCA Section 8(d) unpublished health/safety studies
EPA TSCA TEST SUBMISSION (TSCATS) DATA BASE, JANUARY 2001
NIOSH Analytical Method, 1994: Calcium and compounds, 7020
OSHA ANALYTICAL METHOD #ID-125G
Page last reviewed: November 16, 2018
Content source: National Institute for Occupational Safety and Health