Description
Kolliphor RH 40 is a nonionic solubilizer and emulsifying agent obtained by reacting 1 mole of hydrogenated castor oil with 40 moles of ethylene oxide.
The main constituent of Kolliphor RH 40 is glycerol polyethylene glycol hydroxy- stearate, which, together with fatty acid glycerol polyglycol esters, forms the hydrophobic part of the product. The hydrophilic part consists of polyethylene glycols and glycerol ethoxylate.
Kolliphor RH 40 is a white to yellowish paste at 20 °C. The HLB value lies between 14 and 16. Particular features are that it has very little odour and in aqueous solutions is almost tasteless.