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 | Description |
| Chemical Name | Sodium Lauryl Sulfate (SLS) |
| Chemical Formula | C₁₂H₂₅SO₄Na |
| Appearance | White needle-like crystals |
| Odor | Slightly soapy / fatty |
| Molar Mass | 288.38 g/mol |
| Density | ~1.01 g/cm³ |
| Melting Point | 204–207 °C (decomposes) |
| Solubility | Highly soluble in water; insoluble in alcohol and oils |
| pH (1% solution) | 6–8 |
| Hygroscopicity | Absorbs moisture from air |
| Ionic Nature | Anionic surfactant |
| Foaming Property | High-foaming |
Uses
Personal Care Products
SLS needles are widely used in shampoos, body washes, facial cleansers, and soaps as a foaming and cleansing agent. The needle form allows for accurate weighing and formulation, especially in cosmetic and pharmaceutical production. It helps create stable lather and effectively removes oils and dirt from hair and skin.
Household Cleaning Products
In detergents, dishwashing liquids, and liquid soaps, SLS needles serve as a detergent and surfactant. Their solid crystalline form makes it easier to measure precise quantities for industrial-scale cleaning product formulations. They help emulsify and remove grease, stains, and other contaminants efficiently.
Pharmaceutical and Laboratory Applications
SLS needles are used in medicated creams, gels, and foaming products as an emulsifier and solubilizer. In laboratories, they are used in protein denaturation (SDS-PAGE) and as a surfactant in various chemical reactions. The crystalline form ensures longer shelf life and easier handling in precise experimental setups.
Industrial Uses
In textile, paint, and paper industries, SLS needles act as wetting agents, dispersants, and emulsifiers. The needle form allows for controlled dissolution, which is useful in industrial formulations requiring consistent surfactant concentrations.
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