Sunscreen Formulation: Cold Process, Silicone-Free, Sweat Resistance, SPF/PA

Question

Regarding the following formula, can it be mixed without using heat? I need a sunscreen cream that is not Silicone and is reasonably sweat-resistant. I expect the efficacy to be SPF50 PA++++.

Here is the formula:

น้ำกลั่น ปราศจากเชื้อ: 58%
Bisoctrizole (Compare to Tinosorb M): 10%
Zinc Oxide Neutral: 8%
LipidSoft™ Lite: 8%
PMMA Booster (SPF/Color Booster): 5%
Water-Capsule™ (Water-in-Oil Cream): 4%
WaterGuard™ Lite: 3%
Oil-Fix™ W (Water-Resistant, Oil/Silicone): 2%
Mild Preserved Eco™ (Preservative-Free): 1%
Satin Cream Maker™: 1%

My questions are:

Can this formula be mixed without using heat?
Is this formula Silicone-free?
Will it be reasonably sweat-resistant?
Can it achieve SPF50 PA++++ efficacy?

MySkinRecipes Expert · Accepted Answer

Subject: Analysis of your Sunscreen Formula

Here is an analysis of the sunscreen formula you provided:

Mixing without Heat: While ingredients like the UV filters (Bisoctrizole, Zinc Oxide) and water don't inherently require heat, the need for heat depends on the specific properties of the emulsifiers (Water-Capsule™, Oil-Fix™ W), thickeners/texturizers (Satin Cream Maker™), and film-formers (WaterGuard™ Lite). Many modern ingredients are designed for cold processing, so mixing without heat might be possible, but it is crucial to check the supplier's specific instructions for each of these ingredients to confirm their required processing temperature.
Silicone-Free: Based on the name "Oil-Fix™ W (Water-Resistant, Oil/Silicone)", this ingredient likely contains silicone. Therefore, this formulation is probably not silicone-free.
Sweat Resistance: The formula includes WaterGuard™ Lite (described as water-resistant) and Oil-Fix™ W (also described as water-resistant). These ingredients are specifically added to provide water and sweat resistance, so the formula should offer moderate sweat resistance as you require.
SPF50 PA++++ Efficacy: The combination of Bisoctrizole (Tinosorb M) at 10% and Zinc Oxide at 8%, along with the PMMA Booster, provides a strong base of broad-spectrum UV filters. These concentrations and ingredients are typically capable of achieving high protection levels like SPF50 PA++++. However, the final SPF and PA values depend on the specific formulation, the quality of dispersion of the particulate filters, and actual in-vivo testing.

In summary:

Mixing without heat might be possible, but check supplier instructions for specific ingredients.
The formula likely contains silicone due to Oil-Fix™ W.
It should provide moderate sweat resistance.
It has the potential to achieve SPF50 PA++++, subject to formulation and testing.