Hexamethyldisiloxane (MM)
| Chemical Name: | Hexamethyldisiloxane |
| Product Category: | Silicone Intermediate – Product |
| Structural Formula: |  |
| CAS No.: | 107-46-0 |
| EINECS: | 203-492-7 |
| Molecular Formula: | C6H18OSi2 |
| Molecular Weight: | 162.378 |
Hexamethyldisiloxane Description
Hexamethyldisiloxane (CAS 107-46-0) is a high-purity organosilicon compound with the chemical formula C₆H₁₈OSi₂. This colorless, transparent liquid is insoluble in water but exhibits excellent solubility in most organic solvents. It is widely utilized as a capping agent, cleaning agent, film release agent, and key intermediate in organic synthesis.
As a crucial MM Silicone Intermediate, hexamethyldisiloxane functions as both a solvent and an organic synthesis reagent. Structurally, it serves as the fundamental prototype of silicone ethers and closely resembles the monomeric unit of polydimethylsiloxane, making it essential in various industrial applications, including coatings, electronics, and advanced material processing.
| Density | 0.764g/cm3 |
| Melting point | -59°C |
| Boiling point | 101°C |
| Flash point | -2°C |
| Refractive index | 1.377 (20°C) |
| Appearance | colorless transparent liquid |
| Critical pressure | 1.91MPa |
| Ignition temperature | 341°C |
| Saturated vapor pressure | 5.6kPa (25°C) |
| Uses | The most popular precursor chemical is hexamethyldisiloxane (HMDS) Mainly used as head-sealing agent, cleaning agent, release agent, organic synthesis intermediate, etc. |
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Hexamethyldisiloxane: Guide
Hexamethyldisiloxane is an important silicone raw material used as a capping agent in silicone oil production, and in applications like silicone rubber, pharmaceuticals, gas chromatography fixatives, analytical reagents, water-repellent agents, and cleaning agents for medical electronics.
It has a high chemical bonding energy (460.5 kJ/mol), providing thermal and chemical stability to polysiloxanes. This makes it valuable for durable, high-performance silicone products.
The compound is a colorless, transparent liquid, flammable, and dangerous when exposed to heat, open flames, or strong oxidizers. Its boiling point is 99.5°C, flash point -1.1°C, with a relative density of 0.7606. It is insoluble in water but dissolves in many organic solvents.
