Chemical Substances and Other Issues Under Study (BEI®)

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 2018) 

Chemical Substances

Ethylene oxide
N-Ethylpyrrolidone
n-Hexane
Methyl n-butyl ketone

Methyl chloroform
Nickel
Parathion (added 6-13-17)

Tier 2 (will not move forward with an NIC proposal in 2018) 

Chemical Substances

Acrylamide
Adipates (added 6-13-17)
Aniline
Arsenic
Benzene
Bisphenol A
1-Bromopropane
Chromium (added 6-13-17)

3,3ʹ-Dichlorobenzidine
Di(2-ethylhexyl)phthalate (added 6-13-17)
Ethylene glycol
Furfural
Indium
Iodine (added 6-13-17)
Manganese
Phthalates


Feasibility Assessments

For the substances listed below, the BEI® Committee has determined that developing a BEI® is not currently feasible owing to inadequate scientific data. However, the Committee believes that these substances may pose important risks to the health of workers, and therefore, it encourages the submission of new data. Field or experimental studies on the relationship between biological indicators and either health risk or environmental exposure are needed for these agents. A brief summary of the current negative feasibility assessment, including data needs, for each of the listed substances is available from the ACGIH® Science Group.

Substance

Acrylonitrile
Alachlor
Aluminum
Antimony
Beryllium
Chlorpyrifos
1,4-Dichlorobenzene
2,4-Dichlorophenoxyacetic acid
Diethanolamine
2-Ethyl hexanoic acid 
Hydrazines
Inorganic borates
Manganese
Methyl tert-butyl ether
Methyl n-butyl ketone
Methyl formate
α-Methylstyrene
Nickel
Nitrobenzene
Perfluorooctanoic acid
Selenium
Thallium
Trimethylbenzene
Vanadium pentoxide
Vinyl chloride

Date of Feasibility Assessment

March 1994
September 2009
September 2007
November 1996
November 2010
October 1996
March 1994
March 1994
September 2013
September 2001
March 1994
October 1995
April 1995
October 1993
October 1995
September 2005
November 2010
November 1996
September 2013
April 2007
October 1995
November 2010
August 1999
September 2009
August 2002