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Skeletal formula of decamethylcyclopentasiloxane
CAS number 541-02-6 YesY
PubChem 10913
ChemSpider 10451 YesY
EC number 208-764-9
MeSH Decamethylcyclopentasiloxane
RTECS number GY5945200
Jmol-3D images Image 1
Image 2
Molecular formula C10H30O5Si5
Molar mass 370.77 g mol−1
Appearance Colourless liquid
Density 0.958 g cm-3
Melting point −47 °C; −53 °F; 226 K
Boiling point 210 °C (410 °F; 483 K)
Viscosity 3.74 cP
MSDS External MSDS
EU classification Irritant Xi
R-phrases R36/37/38
S-phrases S23, S24/25
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 73 °C (163 °F; 346 K)
Related compounds
Related Organosilicon compounds tetramethylsilane, silabenzene
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Decamethylcyclopentasiloxane (D5) is a cyclomethicone fluid 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.

See also[edit]

External links[edit]

  • Record in the Household Products Database of NLM