DECAMETHYLCYCLOPENTASILOXANE

541-02-6

Cyclopentasiloxane, decamethyl-

Cyclomethicone 5

2,2,4,4,6,6,8,8,10,10-Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane

CYCLOPENTASILOXANE

Dimethylsiloxane pentamer

Dekamethylcyklopentasiloxan

Dow corning 345

NUC silicone VS 7158

Silicon SF 1202

Ciclopentasiloxane

Cyclic dimethylsiloxane pentamer

Cyclomethicone D5

D5-sil

KF 995

CCRIS 1328

VS 7158

HSDB 5683

UNII-0THT5PCI0R

0THT5PCI0R

Ddecamethylcyclopentasiloxane

EINECS 208-764-9

SF 1202

BRN 1800166

DTXSID1027184

JEESILC CPS-211

XIAMETER PMX-0245

DTXCID907184

CYCLOPENTASILOXANE (D5)

D5

EC 208-764-9

4-04-00-04128 (Beilstein Handbook Reference)

KF-995

DOW CORNING ST CYCLOMETHICONE 5

OCTAMETHYLCYCLOTETRASILOXANE (D5)

KP-545 COMPONENT CYCLOMETHICONE 5

2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentoxapentasilecane

Cyclopentasiloxane, 2,2,4,4,6,6,8,8,10,10-decamethyl-

CYCLOMETHICONE 5 (USP-RS)

CYCLOMETHICONE 5 [USP-RS]

MFCD00046966

Dekamethylcyklopentasiloxan [Czech]

decamethyl cyclopentasiloxane

C10H30O5Si5

Lightening Serum

D5 Cyclomethicone

dimethylcyclopentasiloxane

Decamethylcylopentasiloxane

UNII: 0THT5PCI0R

SCHEMBL28497

N-Propylheptamethyltrisiloxane

CHEMBL1885178

CYCLOPENTASILOXANE [INCI]

3CE PINK IM GOOD MASCARA

CHEBI:191092

Decamethylcyclopentasiloxane, 97%

CYCLOMETHICONE 5 [WHO-DD]

BCP15826

Tox21_303170

CD3770

CYCLOPENTASILOXANE, DECAMETHYL

AKOS008901199

CS-W009767

DB11244

HY-W009051

MCULE-6274880347

DECAMETHYLCYCLOPENTASILOXANE [MI]

NCGC00163981-01

NCGC00257224-01

AS-59731

CAS-541-02-6

DECAMETHYLCYCLOPENTASILOXANE [HSDB]

D1890

D3770

Decamethylcyclopentasiloxane (cyclic monomer)

NS00043162

D78203

S05475

Decamethylcyclopentasiloxane, analytical standard

Q414350

decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane

Cyclomethicone 5, United States Pharmacopeia (USP) Reference Standard

2,2,4,4,6,6,8,8,10,10-Decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane #

D5 Cyclomethicone, Pharmaceutical Secondary Standard; Certified Reference Material

The Henry's Law constant for decamethylcyclopentasiloxane is 33.0 atm-cu m/mole(1). This Henry's Law constant indicates that decamethylcyclopentasiloxane is expected to volatilize rapidly from water surfaces(2). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(2) is estimated as 5.6 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(2) is estimated as 7.6 days(SRC). However, volatilization from water surfaces is expected to be attenuated by adsorption to suspended solids and sediment in the water column. The estimated volatilization half-life from a model pond is 3.8 years if adsorption is considered(3). Decamethylcyclopentasiloxane's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). However, adsorption to soil is expected to attenuate volatilization(SRC). Decamethylcyclopentasiloxane is a volatile methylsiloxane that favors partitioning into the atmosphere(4); therefore, decamethylcyclopentasiloxane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 0.3 mm Hg(5). Evaporation of decamethylcyclopentasiloxane was measured in soil studies and found to occur with rates varying with moisture content, soil type and relative humidity(6). 14C-labeled decamethylcyclopentasiloxane was removed from municipal waste by both adsorption to sludge and volatilization(7); the majority of the material was removed via volatilization; after 3 days, 40% of the material in the aeration/secondary clarifier was removed by volatilization(7). From its use in cosmetic products, decamethylcyclopentasiloxane is reported to evaporate from skin or hair within 4-12 hours after application(8).

Adsorption studies using three soils from the United Kingdom (silt loam, sandy loam and sandy clay loam) determined decamethylcyclopentasiloxane log Koc values of 4.98-5.29 with an average log Koc of 5.17 (Koc of 1.48X10+5)(1). According to a classification scheme(2), these Koc values suggest that decamethylcyclopentasiloxane is expected to be immobile in soil.