What is SLS?
SLS, also known as Sodium Lauryl Sulfate, is a super-cleansing, surfactant capable of strong degreasing. It is one of the more irritating surfactant ingredients and is widely used in cleansers, shampoos, and body washes.
Why is SLS in skin care products?
The standard Chinese name for SLS is "Sodium Lauryl Sulfate" (CAS 68585-34-2), also known as SLS or SDS. SLS is a common raw materials for cleaning chemicals with good detergency and foaming ability, and is mainly used as an emulsifier in skin care products such as creams and lotions.
Emulsifiers are also a component of surfactants, and SLS also has an emulsifying effect. Skin care products containing SLS ingredients are usually used with emulsifiers that have a lower HLB value, commonly glyceryl stearate, which can effectively regulate the balance that needs to be achieved in the HLB value between the emulsifier and the emulsification of the oil.
Emulsifiers made using traditional techniques and improper formulations can result in thicker creams. One way to address this issue is by adding a small amount of fatty acid sulfates — less than 0.5% is sufficient. Fatty acid sulfates are the most readily available and cost-effective component in SLS.
What is the HLB value?
The HLB value is the equilibrium value of the surfactant and the genes between the hydrophilic and lipophilic, which is a measure of the size and strength of the surfactant molecule and the hydrophilic and lipophilic genes between the neutralization of the performance of the specifically defined equilibrium value, also known as the water-oil degree.
The larger the HLB value, the greater the hydrophilicity, the smaller the HLB value, the greater the lipophilicity, the general HLB value is between 1-40, the cut-off point between hydrophilicity and lipophilicity is the HLB is 10, greater than this value hydrophilicity, less than this value lipophilicity.
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