Formulation Questions Answered

Here are the answers to your questions regarding the sunscreen spray formula:

Can Purified Water be replaced with Mineral Water?

Replacing Purified Water with Mineral Water is generally possible in some formulations, but it is not recommended for this specific formula, especially when using Titanium Dioxide 15nm Liquid.

• Mineral water contains minerals (electrolytes) which can affect the stability and texture of cosmetic formulations.
• The product description for Pro Polymer mentions that electrolytes can reduce the viscosity of the gel it forms, potentially requiring a higher concentration of Pro Polymer.
• Crucially, the description for Titanium Dioxide 15nm Liquid explicitly states that it cannot be used in formulas containing electrolytes because its emulsifier is not compatible. Using mineral water will likely cause the formula to destabilize or break.

Therefore, it is best to stick with Purified Water (or de-ionized/distilled water) for this formula to ensure stability and proper emulsification.

Which is better: Titanium Dioxide 200nm EasyDisperse™ or Titanium Dioxide 15nm Liquid?

Neither is inherently "better"; they are designed for different applications.

• Titanium Dioxide 15nm Liquid is a liquid dispersion specifically developed for sunscreen formulations. It is easy to mix, provides broad-spectrum UV protection (especially when combined with Zinc Oxide), is minimally whitening, and is suitable for water-in-oil emulsions.
• Titanium Dioxide 200nm EasyDisperse™ is a powder type primarily intended for make-up products that require coverage and whiteness. Its description explicitly states it is for make-up use only and not for sunscreen products.

For a sunscreen spray formulation, Titanium Dioxide 15nm Liquid is the appropriate choice as it is designed for this purpose and provides effective UV protection without excessive whiteness. Titanium Dioxide 200nm EasyDisperse™ is not suitable for a sunscreen product.