Revised Physical Sunscreen with Foundation Formula (Water-Resistant)

Question

I am developing a physical sunscreen that also functions as a foundation and has some water resistance. Could you provide a suitable formula, considering the need for coverage, skin tone adjustment, and water resistance properties? I am particularly interested in using ingredients like Titanium Dioxide 15nm Liquid, Water-in-Oil EZ, Polyethylene Wax, Silk Mica Powder, and Iron Oxides. I also need guidance on the water phase ingredients such as Satin Cream Maker and Mild Preserved Eco, as well as the mixing procedure and important notes regarding stability and ingredient percentages.

MySkinRecipes Expert · Accepted Answer

Okay, I understand. The staff has provided a revised formula for a physical sunscreen with foundation properties and some water resistance, based on your previous attempts and requirements.

Here is a summary of the proposed formula and instructions from the staff:

Revised Formula:

Oil Phase:

Titanium Dioxide 15nm Liquid: 20% (Reduced percentage as wax and powders help boost SPF)
Water-in-Oil EZ: 3%
Polyethylene Wax: 3% (Added to help powders adhere to the skin)
Silk Mica Powder: 10% (Added for coverage and skin tone adjustment)
Iron Oxides EasyMix™ (pre-mixed color): 5% (Note: This percentage should be adjusted based on the desired skin tone. It can be added gradually in the final step until the desired color is achieved, and 5% might be too high unless the skin tone is very dark.)

Water Phase:

Satin Cream Maker: 0.5%
Mild Preserved Eco: 1%
Water: Remaining percentage (Total formula should add up to 100%)

Instructions:

Heat the oil phase to 70 degrees Celsius and mix well.
Mix the water phase and heat it to a temperature close to the oil phase. The water phase will have a liquid gel consistency.
While continuously mixing the oil phase, slowly add the water phase little by little.

Important Notes from Staff:

The staff adjusted the Titanium Dioxide percentage because the addition of Polyethylene Wax and powders in the formula will help increase the overall SPF.
Polyethylene Wax and powders like Silk Mica Powder and Iron Oxides are included to provide coverage, adjust skin tone, and help the powders adhere well to the skin, contributing to water resistance.
The percentage of Iron Oxides should be adjusted based on the desired skin tone, and 5% might be too high for most tones. It's recommended to add it gradually in the final step.
Try to keep the total oil phase percentage from exceeding 40% to maintain formula stability and prevent separation.

This revised formula aims to provide a physical sunscreen with foundation properties and some water resistance, addressing your goal of having a combined product that is water-resistant.