Hexamethyldisiloxane (HMDSO)

Basic Information of Hexamethyldisiloxane

Hexamethyldisiloxane (HMDSO) is the simplest linear siloxane, with the chemical formula (CH₃)₃Si-O-Si(CH₃)₃. It's a clear, colorless, volatile liquid with a low viscosity and a faint, characteristic odor. Its unique properties, including its low surface tension, excellent spreading ability, and high volatility, make it invaluable in many formulations. Unlike longer-chain silicones, HMDSO is highly volatile, evaporating cleanly without leaving residue.

CAS No.:	107-46-0
EC No.:	203-492-7
Linear Formula:	(CH₃)₃Si-O-Si(CH₃)₃
Molecular Weight:	162.38
Appearance:	Transparent Liquid
Odor:	−59 °C(lit.)
Melting Point:	101 °C(lit.)
Boiling point:	0.764 g/mL at 20 °C(lit.)
Solubility:	0.00037g/l insoluble
Flash Point:	33 °F
RIDADR:	UN 1993 3/PG 2
Chemical Structure:

Key Features and Benefits

• High Purity: Manufactured to stringent quality standards, ensuring consistent performance in sensitive applications.

• High Volatility: Evaporates quickly and completely, making it ideal for products where no residue is desired.

• Low Surface Tension: Provides excellent spreading and wetting properties on various surfaces.

• Non-Greasy Feel: Imparts a smooth, non-oily feel in cosmetic and personal care formulations.

• Chemically Inert: Stable and unreactive under normal conditions, compatible with many organic and inorganic materials.

• Thermal Stability: Maintains its properties over a wide range of temperatures.

Applications of HMDSO

Hexamethyldisiloxane (HMDSO) is a versatile ingredient used across numerous sectors:

• Personal Care Products: Widely used in deodorants, antiperspirants, hair sprays, skin creams, and cosmetics. It acts as a volatile carrier, delivering active ingredients and providing a smooth, silky, non-greasy feel to the skin and hair. Its quick evaporation helps products dry faster.

• Electronics Industry: Employed as a cleaning agent, dielectric fluid, and in chemical vapor deposition (CVD) processes for the fabrication of silicon-based materials and thin films, particularly in the production of low-k dielectrics.

• Textile Industry: Used as a processing aid and in the formulation of textile softeners and water-repellent finishes, improving the feel and performance of fabrics.

• Chemical Intermediate: A crucial starting material for the synthesis of various other organosilicon compounds, including more complex silicones and silylating agents.

• Industrial Lubricants and Fluids: Used in specialized lubricant formulations where volatility and low surface tension are required.

• Antifoaming Agent: Effective in breaking down foam in non-aqueous systems due to its low surface tension.

• Specialty Solvents: Acts as a volatile, non-polar solvent for various organic compounds and polymers.

• Consistent Quality: Our HMDSO meets stringent purity specifications.

• Expert Support: Our technical team provides knowledgeable assistance for your application challenges.

Hazards Classification

• GHS Classification: Flammable Liquid (GHS02), Exclamation Mark (GHS07), Environmental Hazard (GHS09)

• Hazard Statements: Highly flammable liquid and vapor; may cause respiratory irritation; toxic to aquatic life with long lasting effects.

• UN Number: UN 1993

• Hazard Class: 3 (Flammable Liquids)

• Packing Group: II