SLES, short for Sodium Lauryl Ether Sulfate, is a widely used anionic surfactant found in personal care products, household detergents, industrial cleaners, and other formulations.
It is also commonly known as Sodium Laureth Sulfate. SLES is valued for its strong cleansing ability, rich foam, good water solubility, and relatively flexible formulation performance. Commercial SLES is commonly supplied as an aqueous solution or paste at different active-matter concentrations, with 70% active grades widely used for industrial and personal care formulations.
What Does SLES Stand For?
SLES = Sodium Lauryl Ether Sulfate
The name describes the basic structure of the surfactant:
- Sodium – the counter-ion
- Lauryl – refers to the C12 alkyl chain
- Ether – indicates the presence of ethoxy groups
- Sulfate – provides the anionic sulfate group
SLES belongs to the family of alkyl ether sulfates. Compared with Sodium Lauryl Sulfate (SLS), SLES contains ethoxy groups between the hydrophobic alkyl chain and sulfate group. The number of ethoxy units can vary depending on the commercial grade and manufacturing process.
How Does SLES Work?
SLES is a surfactant, which means it can reduce surface tension and help water interact with oils, dirt, and other substances that do not readily mix with water.
A surfactant molecule has two important parts:
- Hydrophobic part – attracted to oils and grease
- Hydrophilic part – attracted to water
When SLES is added to water, its molecules can organize into structures called micelles. These structures help surround and disperse oily substances and dirt in water, making them easier to remove during washing.
This is why SLES is widely used as a cleansing and foaming ingredient in shampoos, liquid soaps, shower gels, detergents, and cleaning products.
What Are the Main Properties of SLES?
SLES is widely used because it provides several useful formulation properties.
1. Strong Cleansing Performance
SLES can effectively help remove oils, grease, dirt, and other contaminants from surfaces, hair, and skin.
This makes it suitable for both personal care and household cleaning formulations.
2. Excellent Foaming
One of the most recognizable characteristics of SLES is its ability to generate abundant foam.
This is particularly useful in:
- Shampoo
- Body wash
- Hand soap
- Facial cleanser
- Liquid detergent
- Dishwashing products
Foam can also improve the consumer perception of cleaning performance, although foam level itself does not necessarily determine actual cleaning efficiency.
3. Good Water Solubility
SLES can be formulated into aqueous systems and is commonly supplied as a concentrated liquid or paste.
This makes it convenient for manufacturers producing liquid detergents and personal care products.
4. Formulation Flexibility
SLES can be combined with other surfactants, including amphoteric and nonionic surfactants, to adjust foam, viscosity, mildness, cleansing performance, and other formulation properties.
5. Cost-Effective Surfactant
SLES is widely used commercially because it provides a combination of cleansing, foaming, and formulation performance at a relatively economical cost.
What Is SLES Used For?
1. Personal Care Products
Personal care is one of the most important application areas for SLES.
It can be found in formulations such as:
- Shampoo
- Body wash
- Liquid hand soap
- Facial cleanser
- Bubble bath
- Shower gel
- Liquid soap
- Toothpaste
- Other rinse-off cleansing products
Its main functions are cleansing, foaming, and helping disperse oily materials.
PubChem lists household detergents, shampoos, and bubble baths among established use categories for SLES.
2. Household Detergents
SLES is also used in household cleaning formulations.
Typical applications include:
- Dishwashing liquid
- Laundry detergents
- Multi-purpose cleaners
- Floor cleaners
- Bathroom cleaners
- Surface cleaning products
In these formulations, SLES can provide detergency and foam while helping disperse oils and dirt.
3. Industrial Cleaning
SLES can also be used in selected industrial cleaning formulations where an anionic surfactant is required.
Potential applications include:
- General-purpose industrial cleaners
- Equipment cleaning formulations
- Surface cleaners
- Detergent concentrates
- Cleaning products for institutional and commercial use
The exact application depends on the formulation requirements, surfactant system, concentration, pH, and compatibility with other ingredients.
What Is SLES 70%?
SLES 70% is a concentrated commercial grade containing approximately 70% active SLES, with the balance consisting primarily of water and formulation-related components depending on the specification.
SLES 70% is widely used by manufacturers because its high active content reduces the amount of water transported compared with lower-active grades.
A typical SLES 70% product may be described by parameters such as:
- Active matter
- Sodium sulfate
- Unsulfated matter
- pH
- Color
- Moisture or water content
- Appearance
- 1,4-dioxane content, where applicable
- Viscosity
Actual specifications can vary between manufacturers, so buyers should always request the supplier’s current TDS and COA before placing an order.
Is SLES Safe?
SLES is widely used in rinse-off personal care products and cleaning formulations.
However, like many surfactants, concentrated SLES can cause skin or eye irritation, particularly when handled as a raw material or used at high concentrations. Appropriate handling procedures, personal protective equipment, and supplier safety documentation should therefore be followed.
For finished personal care products, safety depends on the complete formulation, concentration, exposure conditions, intended use, and applicable regulatory requirements.
Manufacturers should evaluate the specific grade and obtain the relevant SDS, TDS, COA, and regulatory documentation before using SLES in a finished product.
Conclusion
SLES, or Sodium Lauryl Ether Sulfate, is one of the widely used anionic surfactants in modern detergent and personal care formulations. Its combination of cleansing performance, foaming ability, water compatibility, and formulation flexibility makes it suitable for shampoos, shower gels, liquid soaps, detergents, and industrial cleaning products.
When sourcing SLES, manufacturers should look beyond the active-matter percentage and evaluate key parameters such as active content, pH, color, sodium sulfate, unsulfated matter, packaging, and batch consistency.
For industrial procurement, requesting a current TDS, COA, SDS, specification sheet, and sample is a practical way to confirm whether a particular SLES grade meets the formulation and production requirements.
