Functional Roles
Industries Served
Physical Properties
physical_description
Colorless volatile liquid; [Merck Index]
color/form
Colorless volatile liquid
boiling_point
210 u00b0C
melting_point
-38 u00b0C
flash_point
73 u00b0C (163 u00b0F) - closed cup
solubility
In water, 1.7X10-2 mg/L at 25 u00b0C
density
0.9593 g/cu cm at 20 u00b0C
vapor_pressure
0.3 mm Hg at 25 u00b0C (OECD Guideline 104, Static Method Ebuliometer)
logp
log Kow = 8.06 (average of 8.03, 8.07 and 8.09 measurements)
henry's_law_constant
Henry's Law constant = 33.0 atm-cu m/mole at 25 u00b0C
stability/shelf_life
Stable under recommended storage conditions.
decomposition
When heated to decomposition it emits acrid smoke and irritating vapors.
viscosity
3.9 cSt at 25 u00b0C
heat_of_vaporization
Enthalpy of vaporization: 60 kJ/mol
surface_tension
18.5 dyne/cm at 25 u00b0C
refractive_index
Index of refraction = 1.3982 at 20 u00b0C/D
kovats_retention_index
1215.1
other_experimental_properties
An approach was used to measure chemical evaporation rates from leave-on cosmetics and personal care products under realistic consumer exposure conditions, The release of D5 from exposed surfaces of aluminum was very fast with mean rates of 0.029 mg cm(-2)min(-1) and 0.060 mg cm(-2)min(-1) at 23u00b0C and 32u00b0C, respectively. There was a significant effect of cosmetic formulations on the evaporation of D5, with the largest effect being a 2-fold decrease of the evaporation rate for the neat face cream pair at 32u00b0C.
GHS / SDS Safety
Warning
Health Hazard
- H373: May causes damage to organs through prolonged or repeated exposure [Warning Specific target organ toxicity, repeated exposure]
- Not Classified
- H413: May cause long lasting harmful effects to aquatic life [Hazardous to the aquatic environment, long-term hazard]
- Reported as not meeting GHS hazard criteria by 4427 of 4565 companies (only 3% companies provided GHS information). For more detailed information, please visit ECHA C&L website.
- H227: Combustible liquid [Warning Flammable liquids]
Chemical Identity
| CAS Number | 541-02-6 |
| IUPAC Name | 2,2,4,4,6,6,8,8,10,10-decamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane |
| InChI Key | XMSXQFUHVRWGNA-UHFFFAOYSA-N |
| PubChem CID | 10913 |
| INCI Name | CYCLOPENTASILOXANE |
Synonyms & Trade Names
Full Description
Cyclopentasiloxane (D5) is a cyclic silicone fluid that provides emolliency, lubrication, and slip & leveling properties in industrial formulations. This versatile silicone compound serves critical functional roles across beauty & personal care, coatings & construction, HI&I cleaning, industrial manufacturing, plastics & polymers, textiles, and water treatment applications. With a molecular weight of 370.77 and boiling point of 210°C, D5 offers reliable performance characteristics for demanding industrial processes.