Using Urea in Liquid Soap at pH 4-5

Yes, Urea can be used in liquid soap formulations with a pH between 4 and 5. However, it is important to note that Urea can decompose over time, especially at temperatures above 35°C, which leads to an increase in pH.

To maintain the stability of Urea and the desired pH range of 4-5, stabilization is necessary, particularly for products requiring a shelf life of more than 3 months or stored above 30°C. Ingredients like Gluconolactone or Triacetin can be used for this purpose, as suggested in the product descriptions.

Regarding effectiveness, the moisturizing properties of Urea should be maintained at this pH range, provided the Urea remains stable and does not decompose. The primary concern at lower pH is ensuring the stability of the Urea itself.

For use in a cleansing formula like liquid soap, the recommended usage rate for moisturizing typically ranges from 3% to 10%. The product description for Urea powder suggests 3-20% for moisturizing, with 5% being suitable for very dry skin. The liquid form, HYDRO-UREA® Liquid, recommends 1-10%, with 5% being a common recommendation. A starting point of 3-5% is often used for general moisturizing benefits in cleansing products.

Summary:

• Urea can be used in liquid soap at pH 4-5.
• Stabilization with ingredients like Gluconolactone or Triacetin is crucial to maintain pH and Urea stability.
• Effectiveness is maintained if stability is ensured.
• Recommended usage for moisturizing in cleansing formulas is typically 3-10%, with 3-5% being a common range.