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Acetoin

General Description

Synonyms: Acetyl methyl carbinol; 1-Hydroxyethyl methyl ketone; gamma-Hydroxy-beta-oxobutane; 3-hydroxy-2-butanone; 2,3-butanolone; Dimethylketol

OSHA IMIS code: A624 (Acetylmethycarbinol prior to 1/28/09)

CAS number: 513-86-0

Chemical description and physical properties:

  • light yellow liquid
  • molecular formula: C4H8O2
  • molecular weight: 88.10
  • boiling point: 148°C
  • melting point: 15°C
  • flash point: 50°C

Exposure Limits and Health Effects (Updated September 6, 2012)

Standard Set By Exposure Limit Health Effect Codes -- Health Effects and Target Organs
OSHA PEL Not established
NIOSH REL Not established
ACGIH TLV® Not established  
CAL/OSHA PELs Not established

Carcinogenic classification:

  • NTP: Not listed
  • IARC: Not listed
  • EPA: Not listed

EPA Inhalation Reference Concentration (RfC): Not established

ATSDR Inhalation Minimal Risk Levels (MRLs): Not established

NIOSH IDLH concentration: Not established

Notes on other potential health effects and hazards:

  1. Occupational lung diseases have been reported in workers in the microwave popcorn production industry. Several volatile organic compounds, including acetoin, are released from the butter flavoring (NTP 2007).

Partial reference list:

Chemical Sampling Information

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