Description
SLS stands for Sodium Lauryl Sulfate, also known as Sodium Dodecyl Sulfate (SDS) when referring to the pure chemical form. It is a widely used anionic surfactant found in cleaning products, cosmetics, pharmaceuticals, and laboratories.
Chemical properties
| Property | Details |
| Chemical Name | Sodium Lauryl Sulfate |
| IUPAC Name | Sodium dodecyl sulfate |
| Molecular Formula | C₁₂H₂₅NaO₄S |
| Molecular Weight | 288.38 g/mol |
| CAS Number | 151-21-3 |
| EC Number | 205-788-1 |
| Appearance | White or off-white powder |
| Odor | Mild, detergent-like |
| Solubility | Soluble in water |
| pH (1% solution) | ~7 to 9 |
| Melting Point | ~204 °C |
| Boiling Point | Decomposes |
Uses
1. Personal Care and Cosmetic Products
SLS powder is a key ingredient in shampoos, body washes, facial cleansers, and soaps. In these applications, it acts as a foaming agent, helping to create rich lather that enhances the cleaning effect. It also reduces the surface tension of water, allowing it to remove oils, dirt, and impurities from skin and hair. In toothpastes, SLS improves dispersion and cleaning and contributes to the foaming action during brushing.
2.Household Cleaning Products
In household detergents, SLS powder is used in laundry detergents, dishwashing liquids, and liquid soaps. It functions as a detergent and surfactant, helping to emulsify and remove grease, stains, and other contaminants from fabrics, dishes, and surfaces. Its strong wetting and foaming abilities make cleaning more effective and efficient.
3.Industrial Applications
SLS powder is widely used in industrial processes as a wetting agent, emulsifier, and dispersant. In the textile industry, it helps in wetting fibers and ensuring uniform dyeing. In the paint and coatings industry, it disperses pigments and stabilizes formulations. In paper and leather processing, it aids in cleaning, emulsifying, and surface treatment.
4.Pharmaceutical and Laboratory Uses
SLS powder is used in pharmaceutical formulations such as creams, gels, and foaming medicated products, where it helps in emulsifying active ingredients and enhancing solubility. In laboratories, it serves as a protein denaturant in techniques like SDS-PAGE and is used as a surfactant in chemical reactions, formulation studies, and analytical procedures.
5.Miscellaneous Uses
SLS is also employed in the oil and gas industry for enhancing the wetting of drilling fluids, in the food industry in trace amounts as an emulsifier, and in some agricultural formulations to improve wetting and spread of sprays.
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