Overview
Butanedione ( CAS 431-03-8 ), commercially recognized as diacetyl, is a diketone compound used as a flavoring agent and functional ingredient across food, fragrance, and industrial applications.
Its characteristic buttery aroma profile makes it a reference material in flavor development and a target compound in quality control testing for various manufacturing sectors.
In food and beverage manufacturing, diacetyl ( FEMA 2370 ) is used to impart butter, cream, and caramel notes in margarines, dairy analogs, and microwave popcorn coatings.
Flavor houses use it as a building block in complex flavor compositions where low-level dosing achieves high aromatic impact in confectionery products and baked goods.
In personal care, it contributes to fragrance blends targeting warm, gourmand, or dairy-inspired scent profiles. Its reactive diketone functionality also supports cross-linking applications.
This material is utilized in certain polymer and resin curing systems. Butanedione is supplied as a liquid, typically in drum and IBC quantities for industrial buyers.
Food-grade material is available to FCC specification, which is the standard grade for flavor and food manufacturing procurement and regulatory compliance.
Technical-grade supply is also available for non-food industrial uses including fragrance compounding and chemical synthesis for specialized laboratory and production needs.
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Physical Properties
| 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 |
Safety & Handling
Danger GHS02 GHS05 GHS06 GHS07 GHS08 Hazard Statements H225 Highly Flammable liquid and vapor H302 Harmful if swallowed H315 Causes skin irritation H317 May cause an allergic skin reaction H318 Causes serious eye damage H331 Toxic if inhaled H332 Harmful if inhaled H335 May cause respiratory irritation H351 Suspected of causing cancer H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure 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. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P242 Use non-sparking tools. P243 Take action to prevent static discharges. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29141990 |
| UN Number | 2346 |
| ADR Class | 3 |
| Packing Group | II |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 2 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 431-03-8
- EC Number
- 207-069-8
- Mol. Weight
- 86.09
- HS Code
- 29141990
- Category
- Flavors & Fragrances