In sunscreen formulas, silicone film formers (such as polydimethylsiloxane cross-linked polymers) significantly improve the product's water resistance and sun protection factor (SPF) by forming a continuous protective film. Research by Dow Corning in the United States shows that adding 4% silicone elastomer can increase the SPF value of water-in-oil sunscreen from 5.7 to 18, while enhancing water resistance and reducing the amount of sunscreen to reduce irritation2. Silicone resins are widely used in long-lasting sunscreen coatings due to their weather resistance and low surface tension. Their stable Si-O bond structure can resist ultraviolet degradation and extend the product's service life.
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