ISO 4320:1977 Preview
Non-ionic surface active agents -- Determination of cloud point index -- Volumetric method
This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
The determination is carried out by adding, at 30 degree Celsius, of distilled water to a propanol solution to the surface active agent until the appearance of cloudiness. The determination of the cloud point index provided a way of characterizing weakly alkoxylated derivates and their hydrocarbon hydrophobic groups. This simple and rapid measurement is a valuable means for checking the level of alkoxylation of non-ionic derivatives intended, for example, for sulphonation.
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