Melting point :-4--2 °C
Boiling point :88 °C(lit.)
Density :0.985 g/mL at 20 °C
vapor density :3 (vs air)
vapor pressure :52.2 mm Hg ( 20 °C)
FEMA :2370 | DIACETYL
refractive index :n20/D 1.394(lit.)
Flash point :45 °F
storage temp. :Store at +2°C to +8°C.
solubility :200g/l
form :Liquid
color :Clear yellow
Odor :at 1.00 % in propylene glycol. strong butter sweet creamy pungent caramel
Odor Type :buttery
explosive limit :2.4-13.0%(V)
Odor Threshold :0.00005ppm
Water Solubility :200 g/L (20 ºC)
Merck :14,2966
JECFA Number :408
BRN :605398
Exposure limits :ACGIH: TWA 0.01 ppm; STEL 0.02 ppm
NIOSH: TWA 5 ppb; STEL 25 ppb Stability :Stable. Flammable. Incompatible with acids, strong bases, metals, reducing agents, oxidizing agents. Protect from moisture and water. Note low flashpoint.
InChIKey :QSJXEFYPDANLFS-UHFFFAOYSA-N
LogP :-1.340
CAS DataBase Reference :431-03-8(CAS DataBase Reference)
NIST Chemistry Reference :2,3-Butanedione(431-03-8)
EPA Substance Registry System :2,3-Butanedione (431-03-8)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501 H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501 H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310 H331 Toxic if inhaled Acute toxicity,inhalation Category 3 Danger P261, P271, P304+P340, P311, P321,P403+P233, P405, P501 H373 May cause damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 2 Warning P260, P314, P501
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P314 Get medical advice/attention if you feel unwell.