Silicones & Silicates
REACH
Decamethylcyclopentasiloxane
CAS Number
541-02-6
EC Number
208-764-9
Abbreviation
D5
What is Decamethylcyclopentasiloxane?
Decamethylcyclopentasiloxane (CAS 541-02-6), commonly known as D5 or Cyclomethicone 5, is a cyclic silicone fluid.
Where is Decamethylcyclopentasiloxane used?
- Personal care: volatile carrier for active ingredients in antiperspirants, hair serums and skin-conditioning products
- Coatings and release agents: solvent that disperses silicone resins and active components for uniform film formation
- Adhesives and sealants: aids cross-linking by facilitating distribution of curing agents in silicone elastomer matrices
- Automotive detailing and surface treatment: delivers silicone-based protective agents onto paintwork and gives rubber components controlled, even coverage
- It also functions as a surface modifier and emulsification aid, evaporating cleanly without residue.
Commercial specifications
- Drum and IBC quantities
- Cosmetic-grade material meeting purity requirements for personal care use is the most commonly traded specification
Other Names (Synonyms)
Cyclomethicone 5|Dimethylsiloxane pentamer|Dow corning 345|Cyclic dimethylsiloxane pentamer|NUC silicone VS 7158|Silicon SF 1202|Cyclomethicone D5|Cyclopentasiloxane, 2,2,4,4,6,6,8,8,10,10-decamethyl-|D5
What are the physical properties of Decamethylcyclopentasiloxane?
Melting Point -38 °C
Boiling Point 210 °C
Density 0.9593 g/cm³ @ Temp: 20 °C
Flash Point 162 °F
Appearance liquid
Color Colorless
Form Liquid
Water Solubility Immiscible with water.
Vapor Pressure 33.2Pa at 25℃
Refractive Index n 20/D 1.396(lit.)
Log P 8.07 at 24.6℃
How is Decamethylcyclopentasiloxane classified and handled safely? Learn More
Warning
GHS08· Health Hazard
Hazard Statements
H227 Combustible liquid
H373 May causes damage to organs through prolonged or repeated exposure
H413 May cause long lasting harmful effects to aquatic life
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P273 Avoid release to the environment.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
Which trade and regulatory codes apply to Decamethylcyclopentasiloxane?
HS Code 29310095
Packing Group III
Storage Class 10 - Combustible liquids
WGK (Germany) 2