Gel Sunscreen Formulation and UV Protection Levels

Regarding your request for a gel sunscreen formula (Water, Pro Polymer, Phenoxyethanol SA, Titanium Dioxide 15nm Liquid) for 1 kg using a scale:

Here are estimated percentages and amounts in grams for a 1 kg batch:

Formula 1: Gel Sunscreen (without Zinc Oxide)

• Water: 78% (780 g)
• Pro Polymer: 1% (10 g)
• Phenoxyethanol SA: 1% (10 g)
• Titanium Dioxide 15nm Liquid: 20% (200 g)

This formula primarily provides protection against UVB rays and some UVA. It does not offer broad-spectrum protection covering the full UVA/UVB range. It might be sufficient for daily life with minimal sun exposure but is not recommended for strong sunlight. The resulting texture would likely be a translucent to opaque gel, possibly slightly whitish due to the Titanium Dioxide dispersion.

Formula 2: Gel Sunscreen (with Zinc Oxide for Broad Spectrum)
To achieve broader spectrum protection (covering both UVA and UVB), you can add Zinc Oxide. Here is an example formula including Zinc Oxide:

• Water: 68% (680 g)
• Pro Polymer: 1% (10 g)
• Phenoxyethanol SA: 1% (10 g)
• Titanium Dioxide 15nm Liquid: 20% (200 g)
• Zinc Oxide 200nm easydisperse: 10% (100 g)

Adding Zinc Oxide helps to cover a wider range of UV radiation. The resulting texture would be a more opaque and white gel compared to Formula 1.

Note on SPF/PA Values:
Please note that the exact SPF (Sun Protection Factor) and PA (Protection Grade of UVA) values cannot be determined solely from the percentages of ingredients. Accurate SPF and PA values require laboratory testing of the final product.

We hope this information helps!