Formulation Questions

1. Bisdisulizole Disodium (UVA/Water-Soluble) Mixture

You have a mixture containing 22.00% Bisdisulizole Disodium (referred to as DPDT in your composition), 56.70% Water, and 21.30% Triethanolamine.

If you want to add this mixture at a concentration of 10% in your final formula, the amount in grams you need to add depends on the total weight of your final formula.

For example, if your final formula is 100 grams, you would add 10 grams of your Bisdisulizole Disodium mixture (10% of 100 grams).
If your final formula is 500 grams, you would add 50 grams of your Bisdisulizole Disodium mixture (10% of 500 grams).

The amount in grams is calculated as:
Amount of Mixture (grams) = (Desired Percentage of Mixture / 100) * Total Formula Weight (grams)

Using the mixture at 10% in your formula means the final concentration of Bisdisulizole Disodium (DPDT) in your formula will be 10% * 22.00% = 2.2%.

2. Ensulizole (Phenylbenzimidazole Sulfonic Acid) at 8%

Ensulizole (Phenylbenzimidazole Sulfonic Acid) is an effective filter primarily for UVB rays and can be used up to a maximum of 8% according to regulations.

Determining the exact SPF value achieved by using Ensulizole at 8% alone is not straightforward. The final SPF value of a sunscreen formulation is measured on the finished product and depends on several factors, including:

• The concentration and combination of all UV filters used.
• The specific formulation (e.g., emulsion type, presence of film formers, dispersants).
• How the product is applied.

While using 8% Ensulizole will contribute significantly to the UVB protection (SPF), it's not possible to give a precise SPF number without testing the final formula. Ensulizole is less effective against UVA rays, so for broad-spectrum protection, it should be combined with UVA filters.

3. SPF Protect Ultra™ III (UVA+UVB)

SPF Protect Ultra™ III is a broad-spectrum sunscreen blend protecting against both UVA and UVB rays. Based on testing data for this specific product:

• 3.1 To achieve approximately SPF 50: You should use SPF Protect Ultra™ III at a usage rate of approximately 20% in your formula.
• 3.2 To achieve approximately SPF 60: The product description indicates that using 25% provides approximately SPF 70-100. To reach SPF 60, a percentage between 20% and 25% would likely be needed, but based on the provided data points, using 25% is the closest rate provided that exceeds SPF 60. Keep in mind that achieving a precise SPF value requires testing your final formulation.