Decamethylcyclopentasiloxane (D5) is an organosilicon compound with the formula [(CH3)2SiO]5. It is a colorless and odorless liquid that is slightly volatile. The compound is classified as a cyclomethicone. Such fluids are commonly used in cosmetics, such as deodorants, sunblocks, hair sprays and skin care products. It is becoming more common in hair conditioners, as it makes the hair easier to brush without breakage. It is also used as part of silicone based personal lubricants. D5 is considered an emollient. In Canada, among the volume used in consumer products approximately 70% were for antiperspirants and 20% for hair care products.

CAS：541-02-6
中文别名：十甲基环戊硅氧烷;十甲基环五硅氧烷;
英文别名：DecaMethylcyclopentasiloxane;D5 Cyclomethicone;Cyclopentasiloxane, decamethyl-;2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane;
分子式：C10H30O5Si5
分子量：370.77
精确质量：370.094
Psa：46.15
Logp：3.592

MDL号：MFCD00046966

外观与性状：液体
密度：0.958g/mLat 25°C(lit.)
沸点：90°C10mm Hg(lit.)
熔点：-44°C
闪点：162°F
折射率：n20/D 1.396(lit.)
稳定性：Stable. Incompatible with strong oxidizing agents.

RTECS号：GY5945200
安全说明：S23-S24/25
WGK Germany：2
危险类别码：R36/37/38
海关编码：29310095
危险品标志：Xi
危险性描述：H413

生产方法
暂无 广泛使用于化妆品和人体护理产品中，与大部分的醇和其他化妆品溶剂有很好的相容性
用途
广泛使用于化妆品和人体护理产品中，与大部分的醇和其他化妆品溶剂有很好的相容性