Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Registry of Toxic Effects of Chemical Substances (RTECS)

Barium oxide

RTECS #

CQ9800000

CAS #

1304-28-5

Updated

April 2013

Molecular Weight

153.34

Molecular Formula

BaO

Synonyms

Barium monoxide
Barium protoxide
Baryta
Calcined baryta
Oxyde de baryum (French)

Acute Toxicity Data and References

Route/OrganismDoseEffectReference
intraperitoneal/mouse lethal dose (50 percent kill): 146 mg/kgCUTOEX 1,39,1993
intraperitoneal/mouse lethal dose (50 percent kill): 300 mg/kgBehavioral: Somnolence (general depressed activity)

Behavioral: Tetany
VCVN1* -,136,1988
subcutaneous/mouse lethal dose (50 percent kill): 50 mg/kgZVKOA6 19,186,1974

Standards and Regulations

OrganizationStandardReference
Mine Safety and Health Administration (MSHA) STANDARD-airtime-weighted average 0.5 mg(Ba)/m3DTLVS* 3,21,1971
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 0.5 mg(Ba)/m3, JUL2008
Occupational Exposure Limit-BELGIUMtime-weighted average 0.5 mg(Ba)/m3, MAR2002
Occupational Exposure Limit-DENMARKtime-weighted average 0.5 mg(Ba)/m3, MAY2011
Occupational Exposure Limit-FINLANDtime-weighted average 0.5 mg(Ba)/m3, NOV2011
Occupational Exposure Limit-GERMANYMAK 0.5 mg(Ba)/m3, inhal, 2011
Occupational Exposure Limit-HUNGARYtime-weighted average 0.5 mg(Ba)/m3, short term exposure limit 2 mg(Ba)/m3, SEP2000
Occupational Exposure Limit-KOREAtime-weighted average 0.5 mg(Ba)/m3, 2006
Occupational Exposure Limit-MEXICOtime-weighted average 0.5 mg(Ba)/m3, 2004
Occupational Exposure Limit-NEW ZEALANDtime-weighted average 0.5 mg(Ba)/m3, JAN2002
Occupational Exposure Limit-RUSSIAshort term exposure limit 6 mg/m3, JUN2003
Occupational Exposure Limit-SWEDENtime-weighted average 0.5 mg(Ba)/m3, JUN2005
Occupational Exposure Limit-THE NETHERLANDSMAC-TGG 0.5 mg(Ba)/m3, 2003
Occupational Exposure Limit-THE PHILIPPINEStime-weighted average 0.5 mg(Ba)/m3, JAN1993
Occupational Exposure Limit-TURKEYtime-weighted average 0.5 mg(Ba)/m3, JAN1993
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction)8H time-weighted average 0.5 mg(Ba)/m3CFRGBR 29,1926.55,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Federal Contractors)8H time-weighted average 0.5 mg(Ba)/m3CFRGBR 41,50-204.50,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry)8H time-weighted average 0.5 mg(Ba)/m3CFRGBR 29,1910.1000,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards)8H time-weighted average 0.5 mg(Ba)/m3CFRGBR 29,1915.1000,1993

NIOSH Documentation and Surveillance

OrganizationStandardReference
National Occupational Exposure Survey 1983Hazard Code 80341; Number of Industries 22; Total Number of Facilities 913; Number of Occupations 28; Total Number of Employees Exposed 34535; Total Number of Female Employees Exposed 14944
National Occupational Hazard Survey 1974Hazard Code 80341; Number of Industries 13; Total Number of Facilities 218; Number of Occupations 16; Total Number of Employees Exposed 2983

Status in Federal Agencies

OrganizationReference
EPA TSCA Section 8(b) CHEMICAL INVENTORY
TOP