Hello there! 🙂
I am back with a new, simple recipe for a shampoo without SLES (sodium laureth sulfate).
Just to make it clear: I am NOT against SLES in general (HERE you find a recipe of a SLES shampoo I posted a while ago). I still believe that the best shampoos include SLES (these shampoos have the best wetting ability, the best spreading ability, they feel great, they wash great: overall they give a satisfactory experience)… However this ingredient is not suitable for everyone, here the reasons why:
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So now we know how to combine (and why to combine) the different surfactants… but how to calculate the Active Surfactant Matter we want in our product? (which also mean: how much surfactant we have to add to our product to have the surfactant concentration we want to obtain?).
As I already explained the Surfactant Matter of a liquid surfactant which we buy is not 100%: the surfactant is made of the Surfactant Matter and Water (and probably other ingredients like glycerin, for example); therefore every surfactant we buy has a “Active Surfactant Matter” percentage which is what we have to consider.
As I wrote in the previous posts about formulation of detergents (shampoo, bubble bath, shower gel, face wash), the amount of the TOTAL Active Matter of surfactants has to vary according to the purpose of our detergent.
Generally this is the scheme:
– face wash: <10%
– detergent for intimate use: <10%
– shampoo: 10%-15%
– shower gel: 15%-20%
– bubble bath: 20%-25% (in case you really use it only to make bubbles in the bath tub and you never use it directly on your skin, you could even reach 35%… but I don’t suggest it).
Now let’s learn how to formulate the detergent.
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