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DME (Dimethylether = CH3-O-CH3) is a versatile, chemically stable aerosol propellant with a special solvency power for both polar and non-polar ingredients.
DME is an isomer of ethylalcohol and has a low boiling point. It is colourless, virtually odourless, has a low surface tension and a low viscosity.
Owing to its high solubility coefficient, the propellant DME acts also as a solvent in aerosol formulations. This property makes DME a very valuable component in aerosol formulations which contain substances that are difficult to dissolve.
Physical properties Dimethylether (DME)
|Chemical formula||Temperature||:||CH3 - O - CH3||Measurement|
|Vapour Pressure||20° C||:||5.1||bar (abs)|
|50° C||:||11.5||bar (abs)|
|Density liquid||20° C||:||668.3||kg/m³|
|Relative vapour density||20° C||:||1.59||(air = 1)|
|DME in water||20° C/1 bar||:||5.7||% (m/m)|
|20° C/4.8 bar||:||36||% (m/m)|
|Water in DME||20° C/4.8 bar||:||5.5||% (m/m)|
|Net calorific value, liquid||:||28.43||kJ/kg|
|Ignition Point||DIN 51794||:||235||°C|
|Kauri Butanol Number||:||91|
|Surface tension (liquid)||20° C||:||0.0125||N/m|
|Viscosity gaseous||20° C||:||0.0091||mPas|
|Viscosity liquid||20° C||:||0.11||mPas|