Decamethylcyclopentasiloxane (D5)

Decamethylcyclopentasiloxane (D5), often simply called Cyclopentasiloxane, is a key member of the cyclic silicone family. With the chemical formula [(CH₃)₂SiO]₅, it is composed of five dimethylsiloxane units arranged in a stable ring structure. D5 presents as a clear, colorless, odorless, and highly volatile silicone fluid. Its unique attributes, including superior spreadability, a pleasant non-greasy feel, and residue-free evaporation, make it an indispensable ingredient in a wide array of personal care and industrial formulations.

Basic Information of Decamethylcyclopentasiloxane

CAS No.:	541-02-6
EC No.:	208-764-9
Linear Formula:	[(CH₃)₂SiO]₅
Molecular Weight:	370.77
Appearance:	Transparent Liquid
Melting Point:	-44°C
Boiling point:	90 °C/10 mmHg (lit.)
Density:	0.958 g/mL at 25 °C (lit.)
Volatility:	Highly volatile, evaporates quickly and cleanly without leaving residue.
Sensory Feel:	Imparts a light, smooth, and non-greasy feel.
Solubility:	Miscible with a wide range of organic solvents, but insoluble in water.
Spreadability:	Excellent spreading properties on skin, hair, and other surfaces.
Stability:	Chemically inert and highly stable under various conditions.
RIDADR:	UN 1993 / PGIII
Chemical Structure:

Applications of Decamethylcyclopentasiloxane (D5)

Decamethylcyclopentasiloxane (D5) is prized for its versatility and sensory benefits, leading to its extensive use across numerous applications:

• Personal Care and Cosmetics:

• Deodorants and Antiperspirants: Acts as a volatile carrier for active ingredients, providing a smooth, dry application and a non-tacky feel.

• Hair Care Products: Found in conditioners, styling products, and hair sprays to impart shine, enhance manageability, reduce drying time, and prevent static without buildup.

• Skin Care Products: Used in lotions, creams, sunscreens, and makeup removers for its lightweight texture, excellent spreadability, and ability to leave skin feeling soft and smooth.

• Color Cosmetics: Improves the spread and feel of foundations, mascaras, and lipsticks, contributing to a desirable finish.

• Industrial Applications:

• Solvents and Carriers: Functions as a precise, volatile diluent or carrier for specialized industrial formulations, including coatings and cleaners.

• Lubricants: Utilized in light-duty lubricants where a non-greasy, low-viscosity fluid is required.

• Textile and Fabric Treatment: Improves the feel and drape of fabrics, and can enhance water repellency.

• Polishes and Waxes: Aids in even spreading and provides a non-oily, protective finish.

• Consistent Quality: Our rigorous quality control processes ensure every batch meets the highest standards, delivering reliability you can count on.

Hazards Classification

• GHS Classification: Flammable Liquid (GHS02), Health Hazard (GHS08), Environmental Hazard (GHS09)

• Hazard Statements: Flammable liquid and vapor; suspected of damaging fertility or the unborn child; very toxic to aquatic life with long lasting effects.

• UN Number: UN 1993

• Hazard Class: 3 (Flammable Liquids)

• Packing Group: III