TLV^®/BEI^® Resources

ACGIH^® has a procedure that provides the public with an indication of where those chemical substances and physical agents under study fall in the development process. Tier 1 entries indicate which chemical substances and physical agents may move forward as an NIC or NIE in the upcoming year, based on their status in the development process. Tier 2 consists of those chemical substances and physical agents that will not move forward, but will either remain on or be removed from the Under Study list for the next year. For more information, please see the ACGIH^® TLV^®/BEI^® Development Process.

Tier 1 (may move forward with an NIC proposal in 2014)

Chemical Substances

Acetamide Acetylene Acrylonitrile Benzidine Borate compounds, inorganic Boron tribromide Boron trifluoride Bromodichloromethane Butyl acetate, all isomers (added 7/9/13) n-Butyl acetate (see Butyl acetate,     all isomers) sec-Butyl acetate (see Butyl acetate,     all isomers) tert-Butyl acetate (see Butyl acetate,     all isomers) tert-Butyl hydroperoxide Calcium silicate, naturally occurring     as wollastonite Calcium silicate, synthetic nonfibrous Cobalt and inorganic compounds,     as Co Cumene (added 3/11/13) Cyanazine (added 6/13/13) Cyanogen (added 5/9/13) Cyanogen bromide (added 5/9/13) Cyanogen chloride (added 5/9/13) Dibutyl phthalate 1,3-Dichloro-5,5-dimethyl hydantoin Diethyl phthalate Di(2-ethylhexyl)phthalate Dimethyl carbamoyl chloride Dimethyl phthalate Ethyl acrylate Ethylene glycol Formaldehyde Formamide Furan (added 6/13/13) Furfural (added 6/13/13) Furfuryl alcohol Germanium tetrahydride

Gluteraldehyde Glyoxal Hard metals, Cobalt and Tungsten     carbide Hexamethylene diisocyanate Hexylene glycol Hydroquinone Iodoform Isobutyl acetate (see Butyl acetate,     all isomers) (added 3/11/13) Isophorone diisocyanate Lead and inorganic compounds,     as Pb Lithium hydride Methyl acrylate Methyl mercaptan Methyl vinyl ketone Methylene bis(4-cyclohexylisocyanate) Methylene bisphenyl isocyanate Oxalic acid Paraquat Phosphine o-Phthalaldehyde Phthalic anhydride Polymeric MDI Propoxur Silicone tetrahydride Stearates Stoddard solvent Styrene Tetramethyl succinonitrile Thiacloprid Thioglycolic acid Triethanolamine Trimetacresyl phosphate (added 6/13/13) Triorthocresyl phosphate (added 6/13/13) Triparacresyl phosphate (added 6/13/13) Tungsten and compounds, as W Vinyl acetate Warfarin

Chemical Substances as Vapor and Aerosol (V) – Review for Update to Inhalable Fraction and Vapor (IFV)

Iodine and iodides Phenyl ether, vapor Phosphorous (yellow) Tetramethyl lead, as Pb Trichloronaphthalene

Turpentine and selected     monoterpenes Warfarin m-Xylene α,α'-diamine

Chemical Substances for Review of Inhalable Fraction and Vapor (IFV) Notation Update

Ammonium perfluorooctanoate o-Anisidine Benzoyl peroxide Chlordane Chlorinated camphene o-Chlorinated diphenyl oxide o-Chlorobenzylidene malononitrile Chlorodiphenyl (42% Chlorine) Chlorodiphenyl (54% Chlorine) Coumaphos Cyclohexanol Diacetone alcohol Dibutyl phenyl phosphate o-Dichlorobenzene p-Dichlorobenzene Dichloroethyl ether Dinitrobenzene Dinitro-o-cresol Dinitrotoluene Diquat-I Diquat-R Divinyl benzene Endosulfan EPN Ethanol Ethanolamine Ethyl silicate Heptachlor Hexachlorobenzene Hexachloronaphthalene Hexafluoroacetone sec-Hexyl acetate 2-Hydroxypropyl acrylate Isoamyl alcohol Isobutyl nitrite 2-Isopropoxyethanol N-Isopropylaniline Lindane

Methacrylic acid o-Methylcyclohexanone 4,4'-Methylene bis(2-chloroaniline) 4,4'-Methylene dianiline Methyl parathion Nicotine Nitrapyrin p-Nitroaniline Nitroglycerin Nitrotoluene, all isomers 5-Nitro-o-toluidine Octachloronaphthalene Pentachloronaphthalene Pentachloronitrobenzene Pentachlorophenol Pentyl acetate, all isomers m-Phenylenediamine o-Phenylenediamine p-Phenylenediamine Phosphoric acid m-Phthalodinitrile Resorcinol Sesone Sulfometuron methyl Sulfuric acid Sulprofos Temephos 1,1,2,2-Tetrabromomethane Tetrachloronaphthalene Tetraethyl lead, as Pb 1,2,4-Trichlorobenzene Triethanolamine Trimethyl benzene 2,4,6-Trinitrotoluene Triorthocresyl phosphate Triphenyl phosphate Vinyl toluene Xylene, all isomers

Other Issues Under Study Appendix H: Reciprocal Calculation Method for Certain Refined Hydrocarbon Solvent Vapor Mixtures Excursion limits Explosion hazard endnote Sensitization definition Simple asphyxiants and endnote (D) Vapor and aerosol endnote (V)

Tier 2 (will not move forward with an NIC proposal in 2014)

Chemical Substances

Antimony and compounds, as Sb Antimony hydride Antimony trioxide Benz[a]anthracene Benzaldehyde (added 6/13/13) Benzene Benzo[b]fluoranthene Benzo[a]pyrene n-Butyl isocyanate Catechol Chlorine Chlorine dioxide Chromite ore processing (Chromate),     as Cr Chromium and inorganic compounds,     as Cr Chromyl chloride Chrysene Coal tar pitch volatiles, as benzene     soluble aerosol Cobalt carbonyl Cobalt hydrocarbonyl Creosote 3,3'-Dichlorobenzidine Dicyclopentadiene N,N-Dimethyl acetamide Dimethylformamide Dimethyl mercury (added 6/13/13)

Dipropyl ketone 1-Ethoxy-2-propylene Ethyl cyanoacrylate Ethylene oxide (added 6/13/13) Fluorides, as F Fluorine Indium tin oxide (added 6/13/13) Isooctyl alcohol Mercury, alkyl compounds 2-Methoxymethylethoxy propanol Methyl acetylene N-Methylpyrrolidone Methyl tert-butyl ether (added 6/13/13) Monomethylacetamide (added 6/13/13) Monomethylformamide (added 6/13/13) 1-Naphthylamine 2-Naphthylamine Nickel and inorganic compounds,     including Nickel subsulfide,     as Ni Nitric acid Nonylphenol Phosgene Polycyclic aromatic hydrocarbons Propionic acid Terephthalic acid Wood dusts (added 6/13/13)

Chemical Substances Removed from Under Study Effective 3/11/13

Performic acid

5-Vinyl-2-norbornene

Chemical Substances Removed from Under Study Effective 6/13/13

Maleic anhydride

Tungsten carbide