Flavors & Fragrances
REACH
Butanedione
CAS Number
431-03-8
EC Number
207-069-8
What is Butanedione?
Butanedione (CAS 431-03-8), commercially recognized as diacetyl, is a diketone compound used as a flavoring agent and functional ingredient. Also known as FEMA 2370.
Where is Butanedione used?
- Food and beverage: butter, cream and caramel notes in margarines, dairy analogs and microwave popcorn coatings
- Flavor houses: building block in complex flavor compositions for confectionery and baked goods
- Personal care: fragrance blends with warm, gourmand or dairy-inspired profiles
- Cross-linking, polymer and resin curing systems
- It is a reference material in flavor development and a target compound in quality control testing.
Good to know: Food-grade material meets FCC specification, the standard grade for flavor and food manufacturing procurement and regulatory compliance. Technical-grade supply serves non-food industrial uses such as fragrance compounding and chemical synthesis.
Commercial specifications
- Drum and IBC quantities
Other Names (Synonyms)
Dimethyl diketone|diacetyl|Butanedione [UN2346]|Butan-2,3-dione|Butadione|2,3-dioxobutane|2,3-Diketobutane|2,3-butandione
What are the physical properties of Butanedione?
Melting Point -2.4 °C
Boiling Point 88 °C @ Press: 760 Torr
Density 0.990 g/cm³ @ Temp: 15 °C
Flash Point 45 °F
Appearance liquid with a butter-like odour
Color Clear yellow
Odor at 1.00 % in propylene glycol. strong butter sweet creamy pungent caramel
Form Liquid
Water Solubility 200 g/L (20 ºC)
Vapor Pressure 52.2 mm Hg ( 20 °C)
Refractive Index n 20/D 1.394(lit.)
Log P -1.340
How is Butanedione classified and handled safely? Learn More
Danger
GHS02· Flammable GHS05· Corrosive GHS06· Toxic GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H225 Highly Flammable liquid and vapor
H302 Harmful if swallowed
H315 Causes skin irritation
H317 May cause an allergic skin reaction
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
Which trade and regulatory codes apply to Butanedione?
HS Code 29141990
UN Number 2346
ADR Class 3
Packing Group II
Storage Class 3 - Flammable liquids
WGK (Germany) 2