The primary purpose of a shampoo is to clean the hair and scalp; all other attributes such as styling, conditioning split ends, adding shine and improving combability are accomplished by grooming tasks and used for claim purposes to differentiate a product from the competition. Shampoos are different from other cleansing products in that they must function at relatively low, mild temperature conditions; provide instant foam; and leave no residue after rinsing. With regard to their delivery to hair, shampoos must have a viscosity and rheology (usually around 2,000-7,000 cps) that allows them to stay on the palm of a consumer’s hand for efficient transfer. Lastly, surfactants and other additives must be mild to the skin and eyes.
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