TLV-CS Under Study

Chemical Substances and Other Issues Under Study (TLV-CS)

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 indicates 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 2023)

Chemical Substances

Acetylsalicylic acid
Bensulide
Buprofezin
Captafol
Carbon monoxide
Diacetyl
Diazinon
Dicamba
Dimethenamid-P
Endotoxins
Epichlorohydrin
Ethylene glycol dimethyl ether (1,2-Dimethoxyethane)
Fenoxycarb

Formic Acid
Halothane
Malathion
Methyl ethyl ketone (2-butanone)
Molybdenum
Parathion
Pentaborane
Phenyl ethyl alcohol
Sevoflurane
Sodium hydroxide
Sodium silicates
Tertiary butyl hydroperoxide
Triclopyr
Triclosan

Tier 2 (will not move forward with an NIC proposal in 2023)

Chemical Substances

Acrolein
Alkyl acrylates
Anisidine
Benzidine
Bifenazate
1,3-Butadiene
Cadmium
Cadmium carbonate
Cadmium hydroxide
Cadmium nitrate
Carbon dioxide
Carbon nanotubes
Chlorodiphenyl, 42%
Chlorodiphenyl, 54%
Chloromethyl methyl ether
Cobalt carbonyl, as Co
Cobalt hydrocarbonyl
Copper
Desflurane
3,3´-Dichlorobenzidine
Diesel exhaust
Difluorodibromomethane
Diiodomethyl p-tolyl sulfone
Diisopropyl ether
Dimethyl carbamoyl chloride
1,4-Dioxane
Enflurane
Epichlorohydrin
Ethyl acrylate
Ethyl ether
Ethylene oxide
Fentanyl
Fluorides
Furan
Furfural
Furfuryl alcohol
Germanium tetrahydride
Hafnium and compounds
Hexane isomers, other than n-hexane
Hydrogen peroxide
2-Hydroxy-4-methoxybenzo-phenone (oxybenzene)

Imidacloprid
Indium and compounds
4-4´ Isopropylidene diphenol (BPA)
Lead and inorganic compounds, as Pb
Manganese cyclopentadienyl tricarbonyl
Methyl acrylate
2-Methylcyclopentadienyl manganese tricarbonyl
Methylene bisphenyl isocyanate
4, 4´-Methylene bis(2-chloroaniline)
Methyltetrahydrophthalic anhydride isomers
Metribuzin
1-Naphthylamine
2-Naphthylamine (beta)
Nickel and inorganic compounds, including Nickel subsulfide, as Ni
Nitroglycerin
Octachloronaphthalene
m-Phenylenediamine
o-Phenylenediamine
p-Phenylenediamine
Phosphoric acid
Phosphorus (white and yellow)
Phthalic anhydride
Propane sultone
Propylene dichloride (1,2-Dichloropropane )
Sodium hypochlorite
Stoddard solvent
Subtilisins
Talc
Tetraethyl lead
1,2,3,6-Tetrahydrophthalic anhydride
Tetramethyl lead
Tin, organic compounds
Tolclofos-methyl
Trichloronaphthalene
Triethanolamine
Trifloxystrobin
Trimellitic anhydride
Uranium and compounds
Vinylidene chloride
Vinylidene fluoride
Welding fumes

Chemical Substances Removed from Under Study Effective 7-1-2022

Isoprene