Cyclopentasiloxane

Chembox new
Name = Cyclopentasiloxane
ImageFile = Cyclopentasiloxane.jpg
ImageName =
IUPACName = 2,4,6,8,10-pentamethylcyclopentasiloxane
OtherNames = Cyclic pentamer, D5
Section1 = Chembox Identifiers
SMILES = C [SiH] 1O [SiH] (C)O [SiH] (C)O [SiH] (C)O [SiH] (C)O1
CASNo = 541-02-6
RTECS = GY5945200
Section2 = Chembox Properties
Formula = C₅H₂₀O₅Si₅
MolarMass = 370.77 g/mol
Appearance = Clear, nearly odorless liquid
Density = 0.958 g/cm³, liquid
Solubility = Insoluble
MeltingPt = -44°C (229 K)
BoilingPt = 90°C at 10 mmHg (363 K)
Viscosity = 3.74 cP at ?°C
Section7 = Chembox Hazards
ExternalMSDS = [http://www.clearcoproducts.com/pdf/msds/cosmetic/MSDS-Cyclo-2245.pdf External MSDS]
MainHazards = Flammable, irritant
NFPA-H = 1
NFPA-R = 0
NFPA-F = 2
FlashPt = 76°C
RPhrases = 36, 37, 38
SPhrases = 23, 24, 25
Section8 = Chembox Related
Function = Organosilicon compounds
OtherFunctn = silicon carbide, tetramethylsilane, silabenzene

Cyclopentasiloxane is a silicone 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. It can be found in other cosmetics such as sunless tanning lotion. Cyclopentasiloxane is an emollient.