Description
Sodium Lauryl Sulfate (SLS) – Liquid Form
What is SLS Liquid?
Sodium Lauryl Sulfate (SLS) in liquid form is a high-foaming anionic surfactant commonly used in cleansing and detergent formulations. Derived from coconut or palm kernel oil, it is a clear to slightly yellow, viscous liquid and functions primarily as a cleanser, foaming agent, and emulsifier.
💡 SLS is different from SLES (Sodium Laureth Sulfate), which is milder due to ethoxylation.
Key Benefits:
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Excellent Foaming: Produces rich, dense lather, even in hard water.
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Strong Cleansing Power: Removes oils, dirt, and product buildup effectively.
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Low Cost: Very economical and effective at low concentrations.
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Versatile: Works in a wide range of pH and temperature conditions.
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Easy to Use: Already in liquid form, easier to blend into water-based formulations.
Common Uses:
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Shampoos and hair cleansers
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Body washes and shower gels
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Facial cleansers (non-sensitive formulas)
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Liquid soaps and hand washes
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Household cleaning products
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Car wash soaps and industrial cleaners
Usage Rates:
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Shampoos & Body Washes: 10% – 20% (usually combined with milder surfactants)
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Facial Cleansers: 5% – 10% (only in products not intended for sensitive skin)
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Hand Soaps & Liquid Detergents: 10% – 30%
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Industrial/Household Cleaners: Up to 50% or more, depending on use
✅ Always dilute before use and combine with other surfactants (e.g., Cocamidopropyl Betaine) to reduce potential irritation.
Formulation Tips:
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Works best in a pH range of 5.5 – 8.5.
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Can be thickened with salt (NaCl) or thickening agents like xanthan gum or carbomer.
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To reduce harshness, pair with soothing agents (e.g., aloe vera, panthenol) or mild co-surfactants.
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Do not heat excessively; add during the cool-down phase if formulating from scratch.
Safety & Precautions:
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SLS can be irritating to skin and eyes, especially in high concentrations or in leave-on products.
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Avoid in formulations for babies, very dry/sensitive skin, or intimate areas.
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Use with gloves during handling and formulation.
Storage:
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Store in a cool, dry area, tightly sealed.
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Protect from direct sunlight and freezing.
Summary Table:
Application Usage Rate
Shampoo10% – 20%
Body Wash10% – 20%
Hand Wash10% – 30%
Household Cleaners20% – 50%
