NEWS


OARS WEEL documentation. OARS WEEL documentation for 1,1,1,3,3,3-Hexamethyldisilazane (HDMZ) is posted as final.

• OARS WEEL documentation. OARS WEEL documentation for 1,1,2,2-Tetrafluoroethane (HFC-134) is posted as final.

• OARS WEEL documentation. OARS WEEL documentation for trans-1,1,1,4,4,4-Hexafluoro-2-butene (HFO-1336mzz-E) is posted as final.

• OARS WEEL documentation for 1,1,1,3,3,3-Hexamethyldisilazane (HMDZ). The OARS WEEL committee has reviewed the OARS WEEL value for 1,1,1,3,3,3-Hexamethyldisilazane (HMDZ). The document is posted here for a 45-day public comment period. Please submit comments to OARS WEEL at oarsweel@tera.org or fax to 513-488-1990 by May 20, 2018. OARS WEEL documentation for 1,1,2,2-Tetrafluoroethane (HFC-134).

• OARS WEEL documentation for 1,1,2,2-Tetrafluoroethane (HFC-134). The OARS WEEL committee has reviewed the OARS WEEL value for 1,1,2,2-Tetrafluoroethane (HFC-134). The document is posted here for a 45-day public comment period. Please submit comments to Dr. Patricia McGinnis at mcginnis@tera.org or fax to 513-488-1990 by May 17, 2018.

• OARS WEEL documentation. OARS WEEL documentation for Trifluoroiodomethane (CF3I) is posted as final.

• OARS WEEL documentation for trans-1,1,1,4,4,4-Hexafluoro-2-butene (HFO-1336mzz-E). The OARS WEEL committee has reviewed the OARS WEEL value for trans-1,1,1,4,4,4-Hexafluoro-2-butene. The document is posted here for a 45-day public comment period. Please submit comments to Dr. Patricia McGinnis at mcginnis@tera.org or fax to 513-488-1990 by April 7, 2018.

• OARS WEEL documentation for Trifluoroiodomethane (CF3I). The OARS WEEL committee has reviewed the OARS WEEL value for Trifluoroiodomethane. The document is posted here for a 45-day public comment period. Please submit comments to Dr. Patricia McGinnis at mcginnis@tera.org or fax to 513-488-1990 by March 25, 2018.

• The WEEL document for Octamethylcyclotetrasiloxane (D4) and Decamethylcyclopentasiloxane (D5) have been published in the Toxicology and Industrial Health journal. You can find the articles here: http://journals.sagepub.com/toc/tiha/33/1.

• OARS WEEL documentation. OARS WEEL documentation for HCFO-1224yd(Z) is final.

• OARS WEEL documentation. OARS WEEL documentation for Nitroguanidine (NQ) is final.

• OARS WEEL documentation. OARS WEEL documentation for Chlorosulfonic acid, p-Hydroxybenzoic acid, and Sodium Chloroacetate are final.

• OARS WEEL documentation. OARS WEEL documentation for Diisobutylene, Diethylene Glycol (DEG), Tetrachloropyridine, and Trifluoroethanol are final.

• OARS WEEL documentation for Melamine. OARS WEEL documentation for Melamine is final.

• The WEEL committee will hold their Spring meeting at the Royal Saint Charles Hotel in New Orleans on March 17 and 18, 2016 from 8:00 am to 5:00 pm. Please contact oarsweel@tera.org if you are interested in the meeting.

• OARS WEEL documentation for Butyraldehyde. The OARS WEEL value and documentation for Butyraldehyde is final.

• OARS WEEL documentati for Melamine. The OARS WEEL committee has revised the OARS WEEL values for Melamine. The documents are posted here for a 45-day public comment period. Please submit comments to Dr. Patricia McGinnis at mcginnis@tera.org or fax to 513-488-1990 by March 28, 2016.

• OARS WEEL documentation for 2-Chloropropane. The OARS WEEL value and documentation for
2-Chloropropane is final.

• OARS WEEL documentation. The OARS WEEL committee has reviewed the OARS WEEL values for Chlorosulfonic acid, p-Hydroxybenzoic acid, and Sodium Chloroacetate. The documents are posted here for a 45-day public comment period. Please submit comments to Dr. Patricia McGinnnis at mcginnis@tera.org or fax to 513-488-1990 by March 21, 2016.

• OARS WEEL documentation. The OARS WEEL committee has reviewed the OARS WEEL values for Diisobutylene, Diethylene Glycol (DEG), Tetrachloropyridine, and Trifluoroethanol. The documents are posted here for a 45-day public comment period. Please submit comments to Dr. Patricia McGinnis at mcginnis@tera.org or fax to 513-488-1990 by March 10, 2016.

NEWS ARCHIVES (pdf) Click Here

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Workplace Environmental Exposure Levels (WEELs)™


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Workplace Environmental Exposure Levels (WEELs)™ are health-based guide values for chemical stressors. The WEELs provide air concentrations intended to protect most workers from adverse health effects related to occupational chemical exposures.

Click here for the WEEL's table of values

OARS WEEL TABLE


Occupational exposure limits (OELs) are developed for protection of healthy workers; they are not intended for the general public, which includes sensitive populations such as infants, the elderly, or the infirm. OELs are based on repeated daily exposures over a working lifetime. They are normally averaged over an 8-hour workday and serve to protect against acute and chronic health effects.


Click Here to download the PDF version of the table


Substance CAS Source 8-Hour TWA Ceiling or Short-Term TWA Last Revised
Acetone Cyanohydrin 75-86-5 AIHA 2 ppm (skin) 5 ppm (15 min, skin) 1992
Acetophenone 98-86-2 AIHA 10 ppm 2007
Aldicarb 116-06-3 AIHA 0.01 mg/m3 (skin) 2009
Allyl Isothiocyanate 57-06-7 AIHA 1 ppm (15-min, skin, DSEN) 1993
Aminobenzoic Acid, para- 150-13-0 AIHA 5 mg/m3 2001
Aminotri (Methylenephosphonic Acid) 6419-19-8 AIHA 10 mg/m3 2004
Amyl Alcohol, n- 71-41-0 AIHA 100 ppm 2001
Benzaldehyde 100-52-7 AIHA 2 ppm 4 ppm (15-min, DSEN) 1998
Benzenesulfonic acid, 5-chloro-2((2-Hydroxy-1-napthalenyl)-azo)-4-methyl, barium salt (2:1) 5160-02-1 AIHA 1 mg/m3 2008
Benzophenone 119-61-9 AIHA 0.5 mg/m3 2003
Benzoyl Chloride 98-88-4 AIHA 5 ppm (ceiling, skin, DSEN) 2008
Benzyl Alcohol 100-51-6 AIHA 10 ppm 2008
Butylcatechol, 4-tert- 98-29-3 AIHA 2 mg/m3 (ceiling, skin, DSEN) 2001
Butyraldehyde 123-72-8 OARS 25 ppm (75 mg/m3) 2016
Chloramphenicol 56-75-7 AIHA 0.5 mg/m3 2008
Chloroisopropyl)Ether, bis-(2- 39638-92-9 AIHA 3 ppm 2009
Chloropropane, 2- 75-29-6 OARS 50 ppm (161 mg/m3) 2016
Chlorosulfonic Acid 7790-94-5 OARS 2016*
Chlorotrifluoroethylene 79-38-9 AIHA 5 ppm 2010
Cumene Hydroperoxide 80-15-9 AIHA 1 ppm (skin) 2009
Decabromodiphenyl Oxide 1163-19-5 AIHA 5 mg/m3 2009
Decamethylcyclopentasiloxane (D5) 541-02-6 OARS 10 ppm 2015
Decene, 1- 872-05-9 AIHA 100 ppm 2000
Dehydrolinalool 29171-20-8 AIHA 2 ppm 2007
Diallylamine 124-02-7 AIHA 1 ppm (skin) 2009
Dibromoneopentyl Glycol 3296-90-0 AIHA 0.2 mg/m3 2010
Dibutylamine 111-92-2 AIHA 5 ppm (ceiling, skin) 2003
Dichlorophenol, 2,4- 120-83-2 AIHA 1 ppm (skin*) 2004
Diethylbenzenes, mixed isomers 25340-17-4 AIHA 5 ppm 2005
Diethylene Glycol 111-46-6 OARS 10 mg/m3 2016
Diethylene Glycol Monoethyl Ether 111-90-0 AIHA 25 ppm 1991
Difluoroethane, 1,1- 75-37-6 AIHA 1000 ppm 2005
Difluoroethane, 1-Chloro-1,1- 75-68-3 AIHA 1000 ppm 1994
Difluoromethane 75-10-5 AIHA 1000 ppm 1997
Diisobutylene 25167-70-8 OARS 75 ppm (344 mg/m3 ) 2016
Dimethyl Ether 115-10-6 AIHA 1000 ppm 2010
Dimethyl Sulfoxide 67-68-5 AIHA 250 ppm 2003
Dimethyl Terephthalate 120-61-6 AIHA 5 mg/m3 (total) 2000
Dimethyldichlorosilane 75-78-5 AIHA 2 ppm (ceiling) 2001
Dimethylethylamine 598-56-1 AIHA 1 ppm 3 ppm 2011
Dimethyl-para-toluidine, n,n- 99-97-8 AIHA 0.5 ppm 2009
Dinitroanisole, 2,4- (DNAN) 119-27-7 OARS 0.1 mg/m3 (0.01 ppm) 2014
Dowtherm Q 612-00-0, 68987-42-8 AIHA 7.8 mg/m3 2002
Epoxybutane, 1,2- 106-88-7 AIHA 2 ppm 2003
Erythromycin 114-07-8 AIHA 3 mg/m3 2007
Fluoroethane, 1,1-dichloro-1- 1717-00-6 AIHA 500 ppm 3000 ppm (5-min STEL) 2008
Furan 110-00-9 AIHA Worker exposure by all routes should be minimalized to the fullest extent possible. 1993
GlycidylMethacrylate 106-91-2 AIHA 0.5 ppm (skin, DSEN) 2000
Glyoxal 107-22-2 AIHA 0.1 mg/m3 (DSEN) 2000
Hexadiene, 1,4- (mixed cis and trans) 592-45-0 AIHA 10 ppm 2009
Hexafluoro-2-butene, cis-1,1,1,4,4,4- (HFO 1336mzz-Z) 692-49-9 OARS 500 ppm (3350 mg/m3) 2014
Hexafluoro-2-butene, trans-1,1,1,4,4,4- (HFO 1336mzz-E) 66711-86-2 OARS 400 ppm (2680 mg/m3) 2018
Hexafluoropropane, 1,1,1,3,3,3- 690-39-1 AIHA 1000 ppm 1998
Hexamethyldisilazane (HMDZ) 999-97-3 OARS 10 ppm 50 ppm 2018
Hexamethylene Glycol 629-11-8 AIHA 10 mg/m3 2011
Hexanediamine, 1,6- 124-09-4 AIHA 1 ppm 2004
Hexanediol Diacrylate 13048-33-4 AIHA 1 mg/m3 (DSEN) 1998
Hexyl Alcohol, n- 111-27-3 AIHA 40 ppm (eye irritation) 2011
HFE-7100 163702-07-6,

163702-08-7
AIHA 750 ppm 1999
Hydroxybenzoic Acid, 4- 99-96-7 OARS 5 mg/m3 2016
Isobutyraldehyde 78-84-2 AIHA 25 ppm 2002
Isocyanuric Acid 108-80-5 AIHA 10 mg/m3 (total);
5 mg/m3 (respirable)
2005
Isophthalic Acid 121-91-5 AIHA 10 mg/m3 (total);
5 mg/m3 (respirable)
1991
Isoprene 78-79-5 AIHA 2 ppm 2004
Limonene, d- 5989-27-5 AIHA 30 ppm 1993
Lithium Hydroxide 1310-65-2 AIHA 1 mg/m3 (ceiling) 1999
Lithium Oxide 12057-24-8 AIHA 1 mg/m3 (ceiling) 1999
Mancozeb 8018-01-7 AIHA 1 mg/m3 (total, DSEN) 2008
Melamine 108-78-1 OARS 3 mg/m3 2016
Menthol 1490-04-6 OARS 1 ppm 3 ppm (15 min) 2014
Mercaptobenzothiazole, 2- 149-30-4 AIHA 5 mg/m3 (skin, DSEN) 2010
Mercaptoethanol 60-24-2 AIHA 0.2 ppm (skin) 2002
Methoxypropylamine, 3- 5332-73-0 AIHA 5 ppm 15 ppm (15 min) 2009
Methyl Ethyl Ketoxime 96-29-7 AIHA 10 ppm (DSEN) 1990
Methyl-2-Pyrrolidone, n- 872-50-4 AIHA 10 ppm (skin) 2010
Methyltrichlorosilane 75-79-6 AIHA 1 ppm (ceiling) 2001
Monochloroacetic Acid 79-11-8 AIHA 0.5 ppm (skin) 2004
Nitro-1,2,4-Triazol-5-One, 3- (NTO) 932-64-9 OARS 2 mg/m3 2014
Nitroguanidine, 1- (NQ) 556-88-7 OARS 7 mg/m3 2016
Octamethylcyclotetrasiloxane (D4) 556-67-2 OARS 10 ppm 2014
Octanol, 1- 111-87-5 AIHA 50 ppm 2005
Octene, 1- 111-66-0 AIHA 75 ppm 2000
Pentaerythritol Triacrylate 3524-68-3 AIHA 1 mg/m3 (DSEN) 1999
Pentafluoroethane, 1,1,1,2,2- 354-33-6 AIHA 1000 ppm 2009
Pentafluoropropane, 1,1,1,3,3- 460-73-1 AIHA 300 ppm 2001
Phosphono-1,2,4 butanetricarboxylic, 2-acid 37971-36-1 AIHA 10 mg/m3 2006
Picolines 109-06-8, 108-99-6, 108-89-4 AIHA 2 ppm (skin) 5 ppm (15-min, skin) 1988
Piperidine 110-89-4 AIHA 1 ppm (skin) 1996
Polyethylene Glycols (MW > 200) 25322-68-3 AIHA 10 mg/m3 2009
Polypropylene Glycols 25322-69-4 AIHA 10 mg/m3 1997
Potassium Bromate 7758-01-2 AIHA 0.1 mg/m3 2004
Propargyl Bromide 106-96-7 AIHA 0.1 ppm (skin) 1997
Propenoic Acid, isooctyl ester, 2- 29590-42-9 AIHA 5 ppm 2010
Propionaldehyde 123-38-6 AIHA 20 ppm 2002
Propylene Glycol 57-55-6 AIHA 10 mg/m3 2004
Propylene Glycol Monomethyl Ether Acetate 108-65-6 AIHA 50 ppm 2005
Quinoline 91-22-5 AIHA 0.001 ppm (skin) 2006
Sodium Chloroacetate 3926-62-3 OARS 0.5 ppm (2.5 mg/m3 ) 2016
Sodium Hypochlorite 7681-52-9 AIHA 2 mg/m3 (15 min) 2010
Tetrachloropyridine, 2,3,5,6- 2402-79-1 OARS 5 mg/m3 2016
Tetrachlorosilane 10026-04-7 AIHA 1 ppm (ceiling) 1999
Tetraethylene Glycol Diacrylate 17831-71-9 AIHA 1 mg/m3 (skin, DSEN) 1981
TetraethylenePentamine 112-57-2 AIHA 5 mg/m3 (skin, DSEN) 2004
Tetrafluoroethane, 1,1,1,2- (HFC-134a) 811-97-2 AIHA 1000 ppm 2003
Tetrafluoroethane, 1,1,2,2- (HFC-134) 359-35-3 OARS 1000 ppm 2018
Tetrafluoroethane, 2-Chloro-1,1,1,2- 2837-89-0 AIHA 1000 ppm 2005
Tetrafluoropropene, (Z)-1-Chloro-2,3,3,3- (HCFO-1224yd(Z)) 111512-60-8 OARS 1000 ppm 2017
Tetrafluoropropene, 2,3,3,3,- (HFO-1234yf) 754-12-1 AIHA 500 ppm 2009
Tetrafluoropropylene, 1,3,3,3- 1645-83-6 AIHA 800 ppm 2011
Tetrahydrofurfuryl Alcohol 97-99-4 AIHA 0.5 ppm (skin) 1993
Titanium Tetrachloride 7550-45-0 AIHA 0.5 mg/m3 2009
Toluene Diamine, 2,4- and mixed isomers 95-80-7; 25376-45-8 AIHA 0.005 ppm (skin) 2010
Toluenesulfonyl Chloride, para- 98-59-9 AIHA 5 mg/m3 (ceiling) 2009
trans-1-Chloro-3,3,3-trifluoropropylene (HCFO-1233zd(E)) 102687-65-0 OARS 800 ppm 2013
Trichlorosilane 10025-78-2 AIHA 0.5 ppm (ceiling) 1998
Triethoxysilane 998-30-1 AIHA 0.05 ppm 2000
Triethylene Glycol Diacrylate 1680-21-3 AIHA 1 mg/m3 (skin) 1981
Triethylenetetramine 112-24-3 AIHA 1 ppm (skin) 2009
Triethylphosphate 78-40-0 AIHA 7.45 mg/m3 2010
Trifluoro-2,2-Dichloroethane, 1,1,1- 306-83-2 AIHA 50 ppm 2001
Trifluoroethane, 1,1,1- 420-46-2 AIHA 1000 ppm 1996
Trifluoroethanol, 2,2,2- 75-89-8 OARS 0.3 ppm 2016
Trifluoroiodomethane (CF3I) 2314-97-8 OARS 500 ppm 1500 ppm 2018
Trimethoxysilane 2487-90-3 AIHA 0.05 ppm 2010
Trimethylamine 75-50-3 AIHA 1 ppm 2005
Trimethylchlorosilane 75-77-4 AIHA 5 ppm (ceiling) 2001
Trimethylolpropane Triacrylate 15625-89-5 AIHA 1 mg/m3 (skin) 1981
Trimethylolpropane Trimethacrylate 3290-92-4 AIHA 1 mg/m3 (skin) 1981
Trisodium Phosphate 7601-54-9 AIHA 5 mg/m3 (15 min) 2009
Urea 57-13-6 AIHA 10 mg/m3 2007
Vanillin 121-33-5 AIHA 10 mg/m3 2009
Vinylcyclohexene 100-40-3 AIHA 1 ppm 2009
Vinyltrichlorosilane 75-94-5 AIHA 1 ppm (ceiling) 2002

 


*Value withdrawn

Substances Considered But Determined to Have an Inadequate Minimum Data Set:

Chlorine Monoxide
Methylene Butanedioic Acid
1,3-Pentadiene

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