Micro Emulsion (MEs) are water based formulations with a very small emulsified droplet size; this makes the formulation transparent. They are thermodynamically
stable over a wide temperature range due to this very fine droplet size, usually between 0.01 and 0.05 μm. Therefore in contrast to other emulsion systems, where
the oil droplets can slowly coalesce causing phase separation, in ME formulations this does not occur.