Acetone

CAS RN: 67-64-1

Threshold Limit Values

8 hr Time Weighted Avg (TWA): 500 ppm; 15 min Short Term Exposure Limit (STEL): 750 ppm.
A4; Not classifiable as a human carcinogen.
Biological Exposure Index (BEI): Determinant: acetone in urine; Sampling Time: end of shift; BEI: 50 mg/L; Notation: The determinant is nonspecific, since it is also observed after exposure to other chemicals.
2014 Notice of Intended Changes (NIC): These substances, with their corresponding values and notations, comprise those for which (1) a limit is proposed for the first time, (2) a change in the Adopted value is proposed, (3) retention as an NIC is proposed, or (4) withdrawal of the Documentation and adopted TLV is proposed. In each case, the proposals should be considered trial values during the period they are on the NIC. These proposals were ratified by the ACGIH Board of Directors and will remain on the NIC for approximately one year following this ratification. If the Committee neither finds nor receives any substantive data that changes its scientific opinion regarding an NIC TLV, the Committee may then approve its recommendation to the ACGIH Board of Directors for adoption. If the Committee finds or receives substantive data that change its scientific opinion regarding an NIC TLV, the Committee may change its recommendation to the ACGIH Board of Directors for the matter to be either retained on or withdrawn from the NIC. Substance: Acetone; Time Weighted Avg (TWA): 250 ppm; Short Term Exposure Limit (STEL): 500 ppm; Notations: A4, Not Classifiable as a human carcinogen; BEI; Molecular Weight: 58.05; TLV Basis: Central nervous system impairment; Upper respiratory tract and eye irritation.
2014 Notice of Intended Changes (NIC): These substances, with their corresponding indices, comprise those for which (1) a BEI is proposed for the first time, (2) a change in the Adopted index is proposed, (3) retention as an NIC is proposed, or (4) withdrawal of the Documentation and adopted BEI is proposed. In each case, the proposals should be considered trial indices during the period they are on the NIC. These proposals were ratified by the ACGIH Board of Directors and will remain on the NIC for approximately one year following this ratification. If the Committee neither finds nor receives any substantive data that change its scientific opinion regarding an NIC BEI, the Committee may then approve its recommendation to the ACGIH Board of Directors for adoption. If the Committee finds or receives substantive data that change its scientific opinion regarding an NIC BEI, the Committee may change its recommendation to the ACGIH Board of Directors for the matter to be either retained on or withdrawn from the NIC. Chemical: acetone; Determinant: acetone in urine; Sampling Time: end of shift; BEI: 25 mg/L; Notation: The determinant is nonspecific, since it is also observed after exposure to other chemicals.
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