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Registry of Toxic Effects of Chemical Substances (RTECS)

Silica, amorphous - diatomaceous earth

RTECS #

VV7311000

CAS #

61790-53-2; 12750-99-1; 29847-98-1; 37337-67-0; 54511-18-1; 56748-40-4; 67016-73-3

Updated

July 2013

Molecular Weight

N/R

Molecular Formula

N/R

Synonyms

Celite
Diatomaceous earth, natural
Kieselguhr
Silica, amorphous - diatomaceous earth (uncalcined) (ACGIH)
Silica, amorphous, diatomaceous earth, containing >1 % crystalline silica (OSHA)

Reviews

OrganizationStandardReference
International Agency for Research on Cancer (IARC)Cancer Review:Animal Inadequate EvidenceIMEMDT 42,39,1987
International Agency for Research on Cancer (IARC)Cancer Review:Human Inadequate EvidenceIMEMDT 42,39,1987
International Agency for Research on Cancer (IARC)Cancer Review:Animal Inadeauate EvidenceIMEMDT 68,41,1997
International Agency for Research on Cancer (IARC)Cancer Review:Human Inadequate EvidenceIMEMDT 68,41,1997
International Agency for Research on Cancer (IARC)Cancer Review:Group 3IMEMDT 68,41,1997

Standards and Regulations

OrganizationStandardReference
Mine Safety and Health Administration (MSHA) STANDARD-dust in airtime-weighted average 20 mccpfDTLWS* 3,33,1973
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 10 mg/m3, JUL2008
Occupational Exposure Limit-BELGIUMtime-weighted average 10 mg/m3, MAR2002
Occupational Exposure Limit-BELGIUMtime-weighted average 3 mg/m3 (resp. dust), MAR2002
Occupational Exposure Limit-DENMARKtime-weighted average 1.5 mg/m3 (respirable), MAY2011
Occupational Exposure Limit-GERMANYMAK 4 mg/m3, inhal, 2011
Occupational Exposure Limit-ICELANDtime-weighted average 1.5 mg/m3 (resp. dust), NOV2011
Occupational Exposure Limit-KOREAtime-weighted average 10 mg/m3, 2006
Occupational Exposure Limit-MEXICOtime-weighted average 10 mg/m3 (inhalable), 2004
Occupational Exposure Limit-MEXICOtime-weighted average 3 mg/m3 (respirable), 2004
Occupational Exposure Limit-NEW ZEALANDtime-weighted average 10 mg/m3 (inspirable dust), JAN2002
Occupational Exposure Limit-NORWAYtime-weighted average 1.5 mg/m3 (resp. dust), JAN1999
Occupational Exposure Limit-PERUtime-weighted average 10 mg/m3 (inhal), 3 mg/m3 (resp), JUL2005
Occupational Exposure Limit-SWITZERLANDMAK-week 4 mg/m3, inhal, JAN2011
Occupational Exposure Limit-THAILANDtime-weighted average 80 mg/m3, JAN1993
Occupational Exposure Limit-UNITED KINGDOMtime-weighted average 1.2 mg/m3 (resp. dust), OCT2007
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Construction)8H time-weighted average 80 mg/m3/%SiO2CFRGBR 29,1926.55,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Federal Contractors)8H time-weighted average 20 mppcf/(%SiO2+5)CFRGBR 41,50-204.50,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (General Industry)8H time-weighted average 80 mg/m3/%SiO2CFRGBR 29,1910.1000,1994
Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (Shipyards)8H time-weighted average 20 mppcf/(%SiO2+5)CFRGBR 29,1915.1000,1993

NIOSH Documentation and Surveillance

OrganizationStandardReference
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Level TO SILICA, amorphous,diatomaceous earth-airtime-weighted average 6 mg/m3NIOSH* DHHS #92-100,1992
National Occupational Exposure Survey 1983Hazard Code X3017; Number of Industries 109; Total Number of Facilities 11151; Number of Occupations 97; Total Number of Employees Exposed 169362; Total Number of Female Employees Exposed 24496

Status in Federal Agencies

OrganizationReference
EPA TSCA Section 8(b) CHEMICAL INVENTORY
EPA TSCA TEST SUBMISSION (TSCATS) DATA BASE, JANUARY 2001
NIOSH Analytical Method, 1994: Silica, amorphous, 7501
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