| Substance | CAS | 8-Hour TWA | Ceiling or Short-Term TWA | Last Revised | Technical Supporting Documentation |
|---|---|---|---|---|---|
| 2-(dimethylamino)ethanol | 108-01-0 | — | — | — | Contact OEL@AIHA.org |
| Acetone Cyanohydrin | 75-86-5 | 2 ppm (skin) | 5 ppm (15 min, skin) | 1992 | Acetone Cyanohydrin(75-86-5)_DocumentRev2025.pdf |
| Acetophenone | 98-86-2 | 10 ppm | — | 2007 | Acetophenone_(CAS_98-86-2)_Document_Rev-2025 |
| Aldicarb | 116-06-3 | 0.01 mg/m³ (skin) | — | 2009 | Aldicarb_Document_rev_2025 |
| Allyl Isothiocyanate | 57-06-7 | — | 1 ppm (15-min, skin, DSEN) | 1993 | Contact OEL@AIHA.org |
| Aminobenzoic Acid, para- | 150-13-0 | 5 mg/m³ | — | 2001 | Contact OEL@AIHA.org |
| Aminotri (Methylenephosphonic Acid) | 6419-19-8 | 10 mg/m³ | — | 2004 | Aminotri-MethylenephosphonicAcid(CAS6419-19-8)_DocumentRev2025.pdf |
| Amyl Alcohol, n- | 71-41-0 | 100 ppm | — | 2001 | Contact OEL@AIHA.org |
| Benzaldehyde | 100-52-7 | 2 ppm | 4 ppm (15-min, DSEN) | 1998 | Contact OEL@AIHA.org |
| Benzenesulfonic acid, 5-chloro-2((2-Hydroxy-1 napthalenyl)-azo)-4-methyl, barium salt (2:1) | 5160-02-1 | 1 mg/m³ | — | 2008 | Benzenesulfonic-Acid(5160-02-1)_Document_rev_2025.pdf |
| Benzophenone | 119-61-9 | 0.5 mg/m³ | — | 2003 | Benzophenone |
| Benzoyl Chloride | 98-88-4 | — | 5 ppm (ceiling, skin, DSEN) | 2008 | Benzoyl-Chloride(98-88-4)_Document_rev-2025.pdf |
| Benzyl Alcohol | 100-51-6 | 10 ppm | — | 2008 | Benzoyl-Alcohol(100-51-6)_Document_rev-2025.pdf |
| Butylcatechol, 4-tert- | 98-29-3 | — | 2 mg/m³ (ceiling, skin, DSEN) | 2001 | Contact OEL@AIHA.org |
| Chloramphenicol | 56-75-7 | 0.5 mg/m³ | — | 2008 | Chloramphenicol(56-75-7)_Document_rev-2025.pdf |
| Chlorotrifluoroethylene | 79-38-9 | 5 ppm | — | 2010 | Chlorotrifluoroethylene(CAS79–38–9)_OEL_DocumentRev_2025.pdf |
| Cumene Hydroperoxide | 80-15-9 | 1 ppm (skin) | — | 2009 | CumeneHydroperoxide(80-15-9)_Document_rev_2025 |
| Decabromodiphenyl Oxide | 1163-19-5 | 5 mg/m³ | — | 2009 | DecabromodiphenylOxide(1163-19-5)_Document_rev_2025 |
| Decene, 1- | 872-05-9 | 100 ppm | — | 2000 | Decene_1-_ (CAS 872-05-9)_DocumentRev2025.pdf |
| Dehydrolinalool | 29171-20-8 | 2 ppm | — | 2007 | Dehydrolinalool(29171-20-8)_Document_rev_2025.pdf |
| Diallylamine | 124-02-7 | 1 ppm (skin) | — | 2009 | Diallylamine(124-02-7)_Document_rev_2025 |
| Dibromoneopentyl Glycol | 3296-90-0 | 0.2 mg/m³ | — | 2010 | Dibromoneopentyl_glycol_(CAS3296-90-0)_OEL_DocumentRev_2025.pdf |
| Dibutylamine | 111-92-2 | — | 5 ppm (ceiling, skin) | 2003 | Dibutylamine |
| Dichlorophenol, 2,4- | 120-83-2 | 1 ppm (skin*) | — | 2004 | 2-4-Dichlorophenol(CAS120-83-2)_DocumentRev2025.pdf |
| Diethylbenzenes, mixed isomers | 25340-17-4 | 5 ppm | — | 2005 | DowthermJ_(CAS_25340-17-4)_Document_Rev_2025.pdf |
| Diethylene Glycol Monoethyl Ether | 111-90-0 | 25 ppm | — | 1991 | Contact OEL@AIHA.org |
| Difluoroethane, 1,1- | 75-37-6 | 1000 ppm | — | 2005 | 1_1_Difluoroethane |
| Difluoroethane, 1-Chloro-1,1- | 75-68-3 | 1000 ppm | — | 1994 | Contact OEL@AIHA.org |
| Difluoromethane | 75-10-5 | 1000 ppm | — | 1997 | Contact OEL@AIHA.org |
| Dimethyl Sulfoxide | 67-68-5 | 250 ppm | — | 2003 | Dimethyl sulfoxide |
| Dimethyl Terephthalate | 120-61-6 | 5 mg/m³ (total) | — | 2000 | Contact OEL@AIHA.org |
| Dimethyldichlorosilane | 75-78-5 | — | 2 ppm (ceiling) | 2001 | Contact OEL@AIHA.org |
| Dimethyl-para-toluidine, n,n- | 99-97-8 | 0.5 ppm | — | 2009 | N,N-Dimethyl-para-toluidine(99-97-8)_Document_rev-2025.pdf |
| Dowtherm Q | 612-00-0 68987-42-8 | 7.8 mg/m³ | — | 2002 | DowthermQ |
| Epoxybutane, 1,2- | 106-88-7 | 2 ppm | — | 2003 | 1,2-Epoxybutane |
| Erythromycin | 114-07-8 | 3 mg/m³ | — | 2007 | Erythromycin(114-07-8)_Document_rev_2025.pdf |
| Fluoroethane, 1,1-dichloro-1- | 1717-00-6 | 500 ppm | 3000 ppm (5-min STEL) | 2008 | 1,1-Dichloro-1-fluroroethan(1717-00-6)_Document_rev-2025.pdf |
| Furan | 110-00-9 | Worker exposure by all routes should be minimalized to the fullest extent possible. | — | 1993 | Contact OEL@AIHA.org |
| Glycidyl Methacrylate | 106-91-2 | 0.5 ppm (skin, DSEN) | — | 2000 | Contact OEL@AIHA.org |
| Glyoxal | 107-22-2 | 0.1 mg/m³ (DSEN) | — | 2000 | Contact OEL@AIHA.org |
| Hexadiene, 1,4- (mixed cis and trans) | 592-45-0 | 10 ppm | — | 2009 | 1,4-Hexadiene(592-45-0)_Document_rev-2025.pdf |
| Hexafluoropropane, 1,1,1,3,3,3- | 690-39-1 | 1000 ppm | — | 1998 | Contact OEL@AIHA.org |
| Hexanediamine, 1,6- | 124-09-4 | 1 ppm | — | 2004 | 1-6-HexanediamineCAS124-09-4)_DocumentRev2025.pdf |
| Hexanediol Diacrylate | 13048-33-4 | 1 mg/m³ (DSEN) | — | 1998 | Contact OEL@AIHA.org |
| HFE-7100 | 163702-07-6 163702-08-7 | 750 ppm | — | 1999 | Contact OEL@AIHA.org |
| Isobutyraldehyde | 78-84-2 | 25 ppm | — | 2002 | Isobutyraldehyde |
| Isocyanuric Acid | 108-80-5 | 10 mg/m³ (total); 5 mg/m³ (respirable) | — | 2005 | IsocyanuricAcid_(CAS_108-80-5)_Document_Rev_2025.pdf |
| Isophthalic Acid | 121-91-5 | 10 mg/m³ (total); 5 mg/m³ (respirable) | — | 1991 | Contact OEL@AIHA.org |
| Isoprene | 78-79-5 | 2 ppm | — | 2004 | Isoprene(CAS78-79-5)_DocumentRev2025.pdf |
| Limonene, d- | 5989-27-5 | 30 ppm | — | 1993 | Contact OEL@AIHA.org |
| Lithium Hydroxide | 1310-65-2 | — | 1 mg/m³ (ceiling) | 1999 | Contact OEL@AIHA.org |
| Lithium Oxide | 12057-24-8 | — | 1 mg/m³ (ceiling) | 1999 | Contact OEL@AIHA.org |
| Mancozeb | 8018-01-7 | 1 mg/m³ (total, DSEN) | — | 2008 | Mancozeb (8018-01-7) Rev 2025 |
| Mercaptobenzothiazole, 2- | 149-30-4 | 5 mg/m³ (skin, DSEN) | — | 2010 | 2-Mercaptobenzothiazole(CAS149-30-4)_OEL_Document_Rev_2025.pdf |
| Mercaptoethanol | 60-24-2 | 0.2 ppm (skin) | — | 2002 | Mercaptoethanol |
| Methoxypropylamine, 3- | 5332-73-0 | 5 ppm | 15 ppm (15 min) | 2009 | 3-Methoxypropylamine(5332-73-0)_Document_rev-2025.pdf |
| Methyl Ethyl Ketoxime | 96-29-7 | 10 ppm (DSEN) | — | 1990 | Contact OEL@AIHA.org |
| Methyltrichlorosilane | 75-79-6 | — | 1 ppm (ceiling) | 2001 | Contact OEL@AIHA.org |
| Monochloroacetic Acid | 79-11-8 | 0.5 ppm (skin) | — | 2004 | MonochloroaceticAcid(CAS79-11-8)_DocumentRev2025.pdf |
| Octanol, 1- | 111-87-5 | 50 ppm | — | 2005 | 1-Octanol_(CAS_111-87-5)_Document_Rev_2025.pdf |
| Octene, 1- | 111-66-0 | 75 ppm | — | 2000 | Octene, 1-(CAS111-66-0)_DocumentRev2025 |
| Pentaerythritol Triacrylate | 3524-68-3 | 1 mg/m³ (DSEN) | — | 1999 | Contact OEL@AIHA.org |
| Pentafluoroethane, 1,1,1,2,2- | 354-33-6 | 1000 ppm | — | 2009 | Contact OEL@AIHA.org |
| Pentafluoropropane, 1,1,1,3,3- | 460-73-1 | 300 ppm | — | 2001 | Contact OEL@AIHA.org |
| Phosphono-1,2,4 butanetricarboxylic, 2-acid | 37971-36-1 | 10 mg/m³ | — | 2006 | 2-Phosphono-1-2-4-butanetricarboxylic-acid_(CAS_37971-36-1)_Document_Rev_2025.pdf |
| Picolines | 109-06-8 108-99-6 108-89-4 | 2 ppm (skin) | 5 ppm (15-min, skin) | 1988 | Contact OEL@AIHA.org |
| Piperidine | 110-89-4 | 1 ppm (skin) | — | 1996 | Contact OEL@AIHA.org |
| Polyethylene Glycols (MW > 200) | 25322-68-3 | 10 mg/m³ | — | 2009 | PolyethyleneGlycol(CAS25322-68-3)_OEL_DocumentRev_2025.pdf |
| Polypropylene Glycols | 25322-69-4 | 10 mg/m³ | — | 1997 | Contact OEL@AIHA.org |
| Potassium Bromate | 7758-01-2 | 0.1 mg/m³ | — | 2004 | Potassium-Bromate(CAS7758-01-2)_DocumentRev2025.pdf |
| Propargyl Bromide | 106-96-7 | 0.1 ppm (skin) | — | 1997 | Contact OEL@AIHA.org |
| Propenoic Acid, isooctyl ester, 2- | 29590-42-9 | 5 ppm | — | 2010 | 2-propenoic_acid_isooctyl_ester(CAS29590-42-9)_OEL_DocumentRev_2025.pdf |
| Propionaldehyde | 123-38-6 | 20 ppm | — | 2002 | Propionaldehyde |
| Propylene Glycol | 57-55-6 | 10 mg/m³ | — | 2004 | PropyleneGlycol(CAS57-55-6)_DocumentRev2025.pdf |
| Propylene Glycol Monomethyl Ether Acetate | 108-65-6 | 50 ppm | — | 2005 | PGMEA_(CAS_108-65-6)_Docuemnt_Rev_2025.pdf |
| Quinoline | 91-22-5 | 0.001 ppm (skin) | — | 2006 | Quinoline_(CAS_91-22-5)_Document_Rev_2025.pdf |
| Sodium Hypochlorite | 7681-52-9 | — | 2 mg/m³ (15 min) | 2010 | Sodium_hypochlorite(CAS7681-52-9)_OEL_DocumentRev_2025.pdf |
| Tetrachlorosilane | 10026-04-7 | — | 1 ppm (ceiling) | 1999 | Contact OEL@AIHA.org |
| Tetraethylene Glycol Diacrylate | 17831-71-9 | 1 mg/m³ (skin, DSEN) | — | 1981 | Tetraethylene_Glycol_Diacrylate(17831-71-9)_Document_rev-2025.pdf |
| Tetraethylene Pentamine | 112-57-2 | 5 mg/m³ (skin, DSEN) | — | 2004 | TetraethylenePentamine_(CAS_112-57-2)_Document_Rev_2025.pdf |
| Tetrafluoroethane, 1,1,1,2- (HFC-134a) | 811-97-2 | 1000 ppm | — | 2003 | 1,1,1,2-Tetrafluoroethane(CAS811-97-2)_DocumentRev2025.pdf |
| Tetrafluoroethane, 2-Chloro-1,1,1,2- | 2837-89-0 | 1000 ppm | — | 2005 | 2-Chloro-1,1,1,2-Tetrafluoroethan(2837-89-0)_Document_rev-2025.pdf |
| Tetrafluoropropene, 2,3,3,3,- (HFO-1234yf) | 754-12-1 | 500 ppm | — | 2009 | 2-3-3-3-Tetrafluoropropene(CAS754-12-1)_OEL_DocumentRev_2025.pdf |
| Tetrahydrofurfuryl Alcohol | 97-99-4 | 0.5 ppm (skin) | — | 1993 | Tetrahydrofurfuryl alcohol (CAS97-99-4)_DocumentRev_2025.pdf |
| Titanium Tetrachloride | 7550-45-0 | 0.5 mg/m³ | — | 2009 | Titanium_tetrachloride(CAS7550-45-0)_OEL_DocumentRev_2025.pdf |
| Toluene Diamine, 2,4- and mixed isomers | 95-80-7 25376-45-8 | 0.005 ppm (skin) | — | 2010 | Toluene_diamine(CAS25376-45-8)_OEL_DocumentRev_2025.pdf |
| Toluenesulfonyl Chloride, para- | 98-59-9 | — | 5 mg/m³ (ceiling) | 2009 | para-Toluene_sulfonyl_chloride(CAS98-59-9)_OEL_DocumentRev_2025.pdf |
| Trichlorosilane | 10025-78-2 | — | 0.5 ppm (ceiling) | 1998 | Contact OEL@AIHA.org |
| Triethoxysilane | 998-30-1 | 0.05 ppm | — | 2000 | Contact OEL@AIHA.org |
| Triethylene Glycol Diacrylate | 1680-21-3 | 1 mg/m³ (skin) | — | 1981 | Triethylene Glycol Diacrylate (1680-21-3)_Document_rev_2025 |
| Triethylphosphate | 78-40-0 | 7.45 mg/m³ | — | 2010 | Triethylphosphate(CAS78-40-0)_OEL_DocumentRev_2025.pdf |
| Trifluoro-2,2-Dichloroethane, 1,1,1- | 306-83-2 | 50 ppm | — | 2001 | Contact OEL@AIHA.org |
| Trifluoroethane, 1,1,1- | 420-46-2 | 1000 ppm | — | 1996 | Contact OEL@AIHA.org |
| Trimethoxysilane | 2487-90-3 | 0.05 ppm | — | 2010 | Trimethoxysilane(CAS 2487-90-3)_OEL_DocumentRev_2025.pdf |
| Trimethylamine | 75-50-3 | 1 ppm | — | 2005 | Trimethlyamine_(CAS_75-50-3)_Docuement_Rev_2025.pdf |
| Trimethylchlorosilane | 75-77-4 | — | 5 ppm (ceiling) | 2001 | Contact OEL@AIHA.org |
| Trimethylolpropane Triacrylate | 15625-89-5 | 1 mg/m³ (skin) | — | 1981 | Contact OEL@AIHA.org |
| Trimethylolpropane Trimethacrylate | 3290-92-4 | 1 mg/m³ (skin) | — | 1981 | Contact OEL@AIHA.org |
| Trisodium Phosphate | 7601-54-9 | — | 5 mg/m³ (15 min) | 2009 | Trisodium_phosphate(CAS7601-54-9)_OEL_DocumentRev_2025.pdf |
| Urea | 57-13-6 | 10 mg/m³ | — | 2007 | Urea(57-13-6)_Document_rev_2025.pdf |
| Vanillin | 121-33-5 | 10 mg/m³ | — | 2009 | Vanillin(CAS121-33-5)_OEL_DocumentRev_2025.pdf |
| Vinylcyclohexene | 100-40-3 | 1 ppm | — | 2009 | Vinylcyclohexene(CAS100-40-3)_OEL_DocumentRev_2025.pdf |
| Vinyltrichlorosilane | 75-94-5 | — | 1 ppm (ceiling) | 2002 | Vinyl trichlorosilane |