Cyclopentasiloxane, also known as cyclopentadimethylsiloxane or D5 silicone oil, is a type of organic silicon compound that appears as a colorless transparent liquid with a boiling point of 210 ° C. It is volatile and can evaporate the carrier without residue; At the same time, it has good spreading properties and can bring a soft and silky touch to the skin. It has good compatibility with most alcohols and other cosmetic solvents, which makes it widely used in cosmetics and human care products. When used in cosmetics and human care products, cyclopentasiloxane is often used as a softener and drug carrier to increase the softness and comfort of the product, while improving its compatibility and stability. It is also used in antiperspirants and deodorizers as a transient carrier of active salts to enhance product effectiveness. In addition, it can improve the wet combing of hair, making it smoother and leaving no residue. In perfume, cyclopentasiloxane can release fragrance and provide a smooth, non cold feeling to the skin.


Due to its excellent heat resistance, chemical stability, and electrical insulation, D5 is an important chemical raw material used in industrial production to produce various silicone oils and other silicon-based materials.