Label abbreviations descriptions

DIACETYL

Chemical Identification
CAS # 431-03-8
Formula

C₄H₆O₂
Synonyms

biacetyl; 2,3-butanedione, 2,3-butadione, 2,3-diketobutane, dimethyl diketone, dimethylglyoxal, glyoxal, dimethyl-

Physical Properties
Physical description Colorless liquid with a strong chlorine-like odor.
Boiling point 190°F Molecular weight 86.09
Freezing point/melting point 27.7°F Vapor pressure
Flash point 80°F Vapor density 3
Specific gravity 0.99 at 59°F Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 2 NFPA fire rating 3
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) D740
Sampling group
Sampler/Sampling media 2 Specially dried silica gel tubes in series; each tube has a single 600 mg section and a GFF, filter faces forward when sampling [SKC 226-183]
Sampling time*

180 min
Sampling volume (TWA)*

9 L
Sampling flow rate (TWA)*

0.05 L/min
Sampling volume (STEL/Peak/C)*

3 L
Sampling flow rate (STEL/Peak/C)*

0.2 L/min
Analytical method instruments GC-FID
Method reference OSHA 1012 (fully validated)
Notes

Use an opaque tube holder or wrap tubes with aluminum foil or other opaque material while sampling.

Separate the two tubes and cap both ends of each tube as soon as possible after sampling. Individually seal the two tubes. Protect tubes from light after sampling.
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)

Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA REL-TWA

5 ppb (0.005 ppm) 8-hr TWA [2.6 ppb (0.0026 ppm) Action Level]

 TLV-TWA

0.01 ppm [2011]

 PEL-TWA
PEL-STEL REL-STEL

25 ppb (0.025 ppm) [15 minutes]

 TLV-STEL

0.02 ppm [2011]

 PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

NA

 Skin notation

NA

 Skin notation

N

 Skin notation

NA
Notes:

Not established

 Notes: Notes: Notes:

Not established
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

Last Updated Date : 12/22/2020