Sunscreen Formulation with Water-in-Oil EZ™: Water Ratio and Stability

Based on the ingredients you've listed, yes, you can formulate a sunscreen. The formula includes key UV filters like SPF Protect Ultra II and Zinc Oxide 35nm Liquid, along with PMMA Booster which helps enhance SPF values. Water-in-Oil EZ™ is a suitable emulsifier for creating a water-in-oil sunscreen, which is known for being water-resistant and providing good coverage.

Regarding your question about Water-in-Oil EZ™ and the amount of water, it is not true that you can use any amount of water. Water-in-Oil EZ™ is designed to emulsify water into an oil or silicone phase within certain ratios to maintain stability.

According to the product description for Water-in-Oil EZ™:

• For sunscreen formulations, it's typically recommended that the oil/silicone/sunscreen phase is around 30-35%, with the water phase making up the remaining 65-70%.
• For creams/serums for dry skin, the oil/silicone phase is usually 20-35%, with the water phase being 65-80%.
• The thickness of the final formula is influenced by the amount of water; more water generally results in a thicker formula.
• It is recommended that the total proportion of oil + silicone is at the level of 20-35% for stability. If the oil content exceeds 35%, an additional stabilizer like Oil-Fix™ might be needed.
• The mixing method is crucial: water must be added gradually to the oil phase while blending continuously.

Therefore, while you have flexibility within recommended ranges, Water-in-Oil EZ™ cannot effectively emulsify any arbitrary amount of water; the ratio of oil/silicone to water needs to be within specific limits for a stable emulsion.

The ingredients in your formula are:

• Alumina
• SelectSorb™ (PMMA)
• QuikBlur™ (Polymethylsilsesquioxane Solution)
• Polyethylene Wax
• Water-in-Oil EZ™
• LipidSoft™ Disperse
• Allantoin
• Calcium Pantothenate
• Poly-Protect (Hydrolyzed Sclerotium Gum)
• Mild Preserved Eco™
• SPF Protect Ultra II
• Zinc Oxide 35nm Liquid
• PMMA Booster (SPF/Color Booster)

These components are appropriate for creating a water-in-oil sunscreen formulation with added benefits like oil absorption, texture enhancement, soothing properties, and preservation.