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Silicone generally refers to polysiloxane derivatives. One important property is the exchangeability of silicon-oxygen bonds; the second important property lies in its extremely low glass transition temperature. Also due to relatively weak intermolecular interactions, silicone usually has extremely low surface energy, so that liquid silicone can wet most surfaces, while solid silicone rubber surfaces are not easily wetted by high surface energy liquids such as water. Because of these two characteristics, silicone is often used in waterproof coatings, release paper on the back of stickers and baking paper.