Hello, thank you for asking MySkinRecipes to help analyze the Eucerin Sun Anti Age SPF50+ PA+++ formula. I have reviewed the ingredient list you provided.

Based on the ingredient list, I will analyze and answer each of your questions as follows:

Analysis of Eucerin Sun Anti Age SPF50+ PA+++ Formula

1. Base Texture Creation: The ingredients you mentioned, including Carbomer, Xanthan Gum, and Glyceryl Stearate, as well as Acrylates/C10-30 Alkyl Acrylate Crosspolymer (which is a type of Acrylate Crosspolymer), are all key components that help create the texture of this product.

   • Carbomer and Acrylates/C10-30 Alkyl Acrylate Crosspolymer are gelling agents that increase viscosity and build the structure of the water phase of the product.
   • Xanthan Gum is a thickener and helps stabilize the formula.
   • Glyceryl Stearate and Cetearyl Alcohol are emulsifiers and thickeners that help bind the water and oil phases together and contribute to the stability and feel of the cream.
   • Additionally, there is Tapioca Starch that helps absorb oil and provides a dry, comfortable feel on the skin, and Dimethicone, a silicone, that helps improve the texture, making it easy to spread and feel smoother. These ingredients work together to create a lightweight, easy-to-spread gel-cream texture.

2. Sunscreen Percentages for SPF50 PA+++: This formula uses a combination of chemical sunscreens: Homosalate, Butyl Methoxydibenzoylmethane (Avobenzone), Ethylhexyl Salicylate, Ethylhexyl Triazone, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine (Tinosorb S), and Phenylbenzimidazole Sulfonic Acid (Ensulizole). Achieving SPF 50+ PA+++ depends on the synergistic effect of all sunscreen actives in the formula; it's not possible to determine the exact percentage of each active directly from the ingredient list alone. Calculating SPF and PA values requires laboratory testing according to international standards. The required percentages vary depending on the specific sunscreen active and other ingredients in the formula that might affect the sunscreen's performance.

3. Creating a Physical Sunscreen with this Texture and SPF50 PA+++: Creating a physical sunscreen (using Zinc Oxide and/or Titanium Dioxide) to have a lightweight gel-like texture and a high SPF of 50+ PA+++ is more challenging than using chemical sunscreens. This is because physical sunscreens are mineral powders that need to be used at relatively high concentrations to achieve the desired SPF/PA values, which often results in a thick, heavy, and potentially whitening product. Although modern technology with coated physical filters and specific formulation techniques can significantly improve the texture, replicating the exact lightweight feel of a chemical sunscreen gel with physical filters at high SPF is a difficult task requiring complex formulation development.

4. Role of Alcohol denat. in the formula: Alcohol denat. (or Denatured Alcohol) in sunscreen formulas is often included to help dissolve certain chemical sunscreen actives, especially Avobenzone and Ensulizole, which might be difficult to dissolve in other solvents. Additionally, Alcohol helps make the product feel lighter, easier to spread, and faster-drying, contributing to a comfortable, non-greasy feel after application. The presence of Alcohol in this formula is therefore important for the texture and the solubility of some sunscreen actives. Whether it is "necessary" depends on whether you want to achieve the same texture and sunscreen solubility properties. Without Alcohol, alternative solvents or dispersing agents might be needed, potentially affecting the texture and stability of the formula.

5. Formulation: Providing a complete, ready-to-use formula with exact percentages is something I cannot do directly, as it requires expertise in formulation development, compatibility testing of ingredients, and testing the performance and stability of the final product. However, if you wish to experiment with developing a similar sunscreen formula using chemical sunscreens like in this Eucerin formula, I can help you search for the main ingredients identified in this formula on the My SkinRecipes website so you can study the information and order them for your formulation experiments. Key ingredients you might need include the various chemical sunscreens mentioned, gelling agents/thickeners (such as Carbomer, Xanthan Gum, Acrylates Copolymer), emulsifiers (such as Glyceryl Stearate, Cetearyl Alcohol, Sodium Stearoyl Glutamate), solvents/texture modifiers (such as Butylene Glycol Dicaprylate/Dicaprate, C12-15 Alkyl Benzoate, Dimethicone, Alcohol denat. if desired), skin conditioning agents (such as Glycerin, Sodium Hyaluronate, Licorice Extract), and preservatives (such as Phenoxyethanol, Ethylhexylglycerin).

If you are interested in any specific ingredient and would like me to help you search for it on the My SkinRecipes website, please let me know.

I hope this information is helpful in understanding this Eucerin sunscreen formula and serves as a guide for your future formulation endeavors.