This International Standard specifies three methods for determining the cloud temperature of nonionic surfactants derived from ethylene oxide by condensation on a lipophilic compound lacking oxypropylene groups. The choice of method depends on the temperature at which the aqueous solution of the product studied becomes cloudy.
NBN T 63-115-1980 history
1980NBN T 63-115-1980 Non-ionic surface active agents obtained from ethylene oxide -Determination of cloud temperature(cloud point