HLB Calculation for Cosmetic Formula

Question

Regarding the following formula:

Perfect-C™ 5%
Tranexamic Acid 3%
Disodium EDTA 0.2%
Allantoin 0.2%
Phenoxyethanol SA 1%
Butylene Glycol 3%
Bisabolol 1%
LipidSoft™ Lite 5%
Butter Cream Maker™ 4%
Glyceryl Stearate SE 5%
Water to 100%

Can the HLB value be determined for this formula? How is the HLB value calculated? Please provide guidance.

MySkinRecipes Expert · Accepted Answer

Understanding HLB in Your Formula

You've asked about the HLB value for your formula and how to calculate it. HLB, or Hydrophile-Lipophile Balance, is a system used to characterize surfactants like emulsifiers based on their affinity for water versus oil. It's a crucial concept for creating stable emulsions (like creams and lotions).

However, HLB is not a single value for the entire formula. Instead, it's used in two main ways for oil-in-water (O/W) emulsions like yours:

Required HLB (RHLB) of the Oil Phase: Each oil or oil-soluble ingredient has a specific "required HLB" value. This is the optimal HLB that an emulsifier blend needs to have to effectively emulsify that particular oil or oil blend. To find the RHLB of your oil phase (which includes Perfect-C™, LipidSoft™ Lite, Bisabolol, and Cetyl Alcohol), you would calculate a weighted average of the RHLB of each oil-soluble ingredient based on its percentage within the total oil phase.
HLB of the Emulsifier Blend: Each individual emulsifier (in your formula, Butter Cream Maker™ and Glyceryl Stearate SE) has its own HLB value. To find the HLB of your emulsifier blend, you calculate a weighted average of the individual HLB values of Butter Cream Maker™ and Glyceryl Stearate SE based on their percentages within the total emulsifier blend.

For a stable emulsion, the HLB of the emulsifier blend should ideally match the required HLB of your oil phase.

Why Calculation Isn't Possible Here

Based on the product information available, the specific HLB values for the ingredients in your formula (such as Perfect-C™, LipidSoft™ Lite, Bisabolol, Cetyl Alcohol, Butter Cream Maker™, and Glyceryl Stearate SE) are not provided. Without these individual values, it is not possible to calculate either the required HLB of your oil phase or the resulting HLB of your emulsifier blend using the standard calculation method.

Formulating stable emulsions often requires knowing these specific HLB values or relying on the manufacturer's recommendations for usage rates and compatibility with specific oil phases.