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Registry of Toxic Effects of Chemical Substances (RTECS)

Silicon

RTECS #

VW0400000

CAS #

7440-21-3

Updated

July 2013

Molecular Weight

28.09

Molecular Formula

Si

Synonyms

Defoamer S-10
Polyeristalline silicon powder
Silicon (ACGIH:OSHA)

Skin and Eye Irritation and References

Route/OrganismDoseEffectReference
eye /rabbit 3 mg mildFAONAU 53A,21,1974

Acute Toxicity Data and References

Route/OrganismDoseEffectReference
intraperitoneal/rat lowest published lethal dose: 500 mg/kgOlfaction: Other olfaction effects

Eye: Other eye effects

Lung, Thorax, or Respiration: Respiratory stimulation		NTIS** OTS0536164
oral/rat lethal dose (50 percent kill): 3160 mg/kgFAONAU 53A,21,1974

Standards and Regulations

OrganizationStandardReference
Mine Safety and Health Administration (MSHA) STANDARD-airtime-weighted average 10 mg/m3DTLWS* 3,27,1973
Occupational Exposure Limit IN ARGENTINA, BULGARIA, COLOMBIA, JORDAN check ACGIH TLV;
Occupational Exposure Limit IN SINGAPORE, VIETNAM check ACGIH TLV
Occupational Exposure Limit-BELGIUMtime-weighted average 10 mg/m3, MAR2002
Occupational Exposure Limit-DENMARKtime-weighted average 10 mg/m3, MAY2011
Occupational Exposure Limit-FRANCEVME 10 mg/m3, FEB2006
Occupational Exposure Limit-ICELANDtime-weighted average 0.5 ppm (0.7 mg/m3), NOV2011
Occupational Exposure Limit-KOREAtime-weighted average 10 mg/m3, 2006
Occupational Exposure Limit-MEXICOtime-weighted average 10 mg/m3;short term exposure limit 20 mg/m3 (inhalable), 2004
Occupational Exposure Limit-NEW ZEALANDtime-weighted average 10 mg/m3 (inspirable dust), JAN2002
Occupational Exposure Limit-NORWAYtime-weighted average 10 mg/m3, JAN1999
Occupational Exposure Limit-PERUtime-weighted average 10 mg/m3 (inhal), 4 mg/m3 (resp), JUL2005
Occupational Exposure Limit-SWITZERLANDMAK-week 3 mg/m3, resp, JAN2011
Occupational Exposure Limit-THE NETHERLANDSMAC-TGG 10 mg/m3, 2003
Occupational Exposure Limit-UNITED KINGDOMtime-weighted average 10 mg/m3 (inhal. dust), OCT2007
Occupational Exposure Limit-UNITED KINGDOMtime-weighted average 4 mg/m3 (resp. dust), 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 SILICON, respirable fraction-air10H time-weighted average 5 mg/m3NIOSH* DHHS #92-100,1992
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Level TO SILICON, total dust-air10H time-weighted average 10 mg/m3NIOSH* DHHS #92-100,1992
National Occupational Exposure Survey 1983Hazard Code X4229; Number of Industries 1; Total Number of Facilities 12; Number of Occupations 5; Total Number of Employees Exposed 1740; Total Number of Female Employees Exposed 503
National Occupational Exposure Survey 1983Hazard Code X4230; Number of Industries 6; Total Number of Facilities 118; Number of Occupations 6; Total Number of Employees Exposed 1962; Total Number of Female Employees Exposed 112
National Occupational Exposure Survey 1983Hazard Code X6495; Number of Industries 1; Total Number of Facilities 19; Number of Occupations 2; Total Number of Employees Exposed 2379
National Occupational Exposure Survey 1983Hazard Code 68695; Number of Industries 296; Total Number of Facilities 59062; Number of Occupations 129; Total Number of Employees Exposed 693583; Total Number of Female Employees Exposed 28164
National Occupational Hazard Survey 1974Hazard Code 68695; Number of Industries 48; Total Number of Facilities 3856; Number of Occupations 66; Total Number of Employees Exposed 99138

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

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