Sunscreen Formulation Advice

Regarding your sunscreen formula using Zinc Oxide 35nm Liquid, Titanium Dioxide 15nm Liquid, Light Cream Maker, and water, it is not balanced and cannot be made without heat.

Here's why:

• Emulsifier Limitation: Light Cream Maker can only emulsify up to 20% oil. Your formula contains 15% Zinc Oxide 35nm Liquid and 12% Titanium Dioxide 15nm Liquid, totaling 27% oil phase, which exceeds the capacity of Light Cream Maker.
• Heat Requirement: Both Titanium Dioxide 15nm Liquid and Zinc Oxide 35nm Liquid recommend heating to 70°C for proper dispersion and integration into the formula. Additionally, the recommended alternative emulsifier, Milk Lotion Maker, requires heat during the mixing process.

For a balanced formula suitable for sunscreen, consider using an emulsifier that can handle a higher oil load and follow a process that involves heating. The staff recommended an alternative formula using Milk Lotion Maker, which can emulsify up to 40% oil. Here is an example formula based on their suggestion:

SPF50 Sunscreen Example Formula

1. Water: 66%
2. Milk Lotion Maker: 3%
3. LipidSoft: 5%
4. Phenoxyethanol SA: 1%
5. Titanium Dioxide 15nm Liquid: 25%

In this example, you can replace some of the Titanium Dioxide 15nm Liquid with Zinc Oxide 35nm Liquid to achieve broad-spectrum UVA/UVB protection. Remember that Milk Lotion Maker requires heating to 70°C during the mixing process to properly emulsify the oil phase.

Always perform a challenge test on your final formulation to ensure the effectiveness and suitability of the preservative system.