In the SI, the. angle of optical rotation is expressed in radians (rad). The optical rotation is measured on a layer of suitable thickness (optical path length. l. ) at the wavelength Î». and temperature T specified in the monograph. A typical optical path length is 100 mm, the most common. wavelength is 589 nm (Sodium D-Line), while the reference temperature is usually between 20-25 Â°C.
Cetearyl, Cetyl, Myristyl and Behenyl Alcohols are straight-chain alcohols. Isostearyl Alcohol is a branched chain alcohol. Cetearyl Alcohol is a mixture of mostly of Cetyl and Stearyl Alcohols, which are fatty alcohols that occur naturally in small quantities in plants and animals. Myristyl Alcohol is a 14 carbon chain. Cetyl Alcohol has 16 carbons, while Stearyl and Isostearyl Alcohols have 18 carbons.
So here is the tenuous connection: synthetic cetearyl ethylhexanoate (PurCellin Oil) is an ester and it repels water, duck preening oil contains other different esters and it also repels water! In fact all (ester) waxes repel water.sters are a very common class of compound in nature â all oils and waxes are esters. An ester is a combination of an alcohol and an acid. Cetearyl ethylhexanoate (PurCellin Oil) is a synthetic ester, it is a combination of cetyl and stearyl alcohols with 2-ethylhexanoic acid.