Product name: diketene; diketen; Ketenedimer, 99 %; Ketene Dimer; DK; Acetyl ketene; 4-Methylene-2-oxetanone; But-3-en-3-olide 
CAS No .: 674-82-8 
EINECS number: 211-617-1 
Molecular formula:C4H4O2

Basic information  Product Name: diketen; Ketenedimer, 99%; Ketene Dimer; DK; Acetyl ketene; 4-Methylene-2-oxetanone; But-3-en-3-olide; 4-methylideneoxetan-2-one; but -1-ene-1, 3-dione 
Molecular weight 84.0744

Main quality index:

Physical and chemical properties  nature: colorless, flammable liquid odor stimuli. The relative density of 1.0897 (20/20 ℃). Melting point of -7.5 ℃.  boiling point 127.4 ℃. Refractive index nD (20 °C) 1.4379. Specific heat capacity 0.1990kJ/(kg • ℃). Flash point 34 ℃. Soluble in ordinary organic solvents. Chemical nature of lively. Layered in water.

Packaging and Storage: flammable materials, glass-lined or should be stored in an aluminum container, a low temperature (0 ~ 5 ℃) storage. Transport and fire, inorganic acid and water contact, is strictly prohibited to prevent explosion. According to the provisions of storage of flammable chemicals.

The main uses: as drug intermediates, food preservatives, pigments and modifiers