White Granule Emulsifier Steareth-21 CAS NO 9005 00 9 Steareth-21 is a non-ionic surfactant that appears as white granules with an average degree of ethoxylation of 21. Its INCI name is Stealeth-21 and its CAS number is 9005-00-9. Due to its high HLB value (about 15-16), it is widely used in oil in water (O/W) systems and can provide reliable emulsification effects even in complex formulation environments. The packaging specification is adopted as 10kg/box, which is convenient for batch use.
From a chemical perspective
This ingredient is prepared by ethoxylation of stearyl alcohol, and contains 21 ethylene oxide units in the molecule, which gives it strong hydrophilicity. Therefore, it is very suitable for use as the main emulsifier or in combination with low HLB value emulsifiers such as Stealeth-2 as an auxiliary emulsifier. By adjusting Steareth-21, the balance of hydrophilic phase and lipophilic phase can be precisely adjusted, allowing the formulator to better control the stability and texture of lotion.
Functional role in the formula
In cosmetics, Stealeth-21 is an efficient non-ionic emulsifier, particularly suitable for formulations that require long-term maintenance of viscosity stability and resistance to electrolyte effects. It is commonly used in face cream, lotion and sunscreens to improve the dispersion of active ingredients and help prevent oil-water separation. Its ability to dissolve and stabilize oil droplets in the aqueous phase can make the lotion smooth and even, extend the product shelf life and improve the appearance texture.
Application
In the oil in water lotion, the addition amount of Steareth-21 is usually 1 – 5%, depending on the oil phase content and formula requirements. When in use, it needs to be added to the oil phase, heated to 70-80 ° C, and then emulsified. It has good compatibility with vegetable oil, silicone, sunscreen, and functional active ingredients, and has a wide range of applications. When mixed with other oil in water emulsifiers, it can enhance the resistance of lotion to pH fluctuations and electrolytes, and is very suitable for the formula for sensitive muscles or sensitive skin.