Cyclopentasiloxane (and) Trimethylsiloxysilicate. X-21-5250 by Shin-Etsu is a medium hardness silicone MQ resin film former. It offers resistance to water and sebum. The resin is dissolved in cyclopentasiloxane (D5), which evaporates to leave behind a film that can improve a preparation's water repellence. X-21-5250 is used in sunscreen and make-up products.
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