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Sodium Laureth Sulphate (SLES) – Grades & Specifications

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Sodium Laureth Sulphate (SLES) is a versatile surfactant widely used in various industries, including personal care, household cleaning, and pharmaceuticals. It is available in  below mentioned grades and concentrations to meet diverse application requirements.

Industrial Grade

Analytical Grade

Some manufacturers also offer  “ultra-pure grades” of SLES. These grades exhibit higher levels of purity and lower levels of impurities, making them suitable for specific applications in the pharmaceutical industry. Ultra-pure SLES ensures compliance with stringent quality standards required for pharmaceutical formulations.

Concentrations of SLES

SLES concentration can be tailored by manufacturers according to customer requirements. However, it is commercially available in two primary concentrations:

SLES 28% Concentration Grade

This is a lower concentration typically used in formulations requiring a milder surfactant effect.

 

SpecificationStatus
Appearance at 25°CPale straw pourable paste
Freezing point10°C
Active Matter28.0 ± 2.0 %
Unsulphated Matter (max)3.50%
Chloride ion (max)0.30%
Sodium Sulphate (max)1.50%
pH (2% solution)7.0~9.0
1,4-Dioxane (max)20 ppm
Active Matter70.00%
Unsulphated Matter2.00%
Sodium Sulphate1.00%
Chloride ion0.10%

SLES 70% Concentration Grade

This higher concentration is favored for its potent surfactant properties, making it ideal for concentrated cleaning and personal care products.

SpecificationStatus
Appearance at 25°CPale straw pourable paste
Freezing point10°C
Active Matter70.0 ± 2.0 %
Unsulphated Matter (max)3.50%
Chloride ion (max)0.30%
Sodium Sulphate (max)1.50%
pH (2% solution)7.0~9.0
1,4-Dioxane (max)20 ppm
Active Matter70.00%
Unsulphated Matter2.00%
Sodium Sulphate1.00%
Chloride ion0.10%

The specifications of SLES also vary depending on the ethoxylation level. Ethoxylation refers to the number of ethoxy (EO) groups attached to the SLES molecule. The most commercially traded SLES typically has an ethoxylation level of 2 (SLES-2). This level balances performance and cost, making it widely accepted in the market.

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