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1,1,3,3-Tetramethyldisiloxane
1. Basic Information
Name: 1,1,3,3-Tetramethyldisiloxane
Alias: TMDS, Bis(dimethylsilyl) ether
CAS No.: 3277-26-7
Molecular Formula: C4H14OSi2
Molecular Weight: 134.32
Category: Silicone synthetic monomer, hydrosilylation reagent, silicone coating raw material, hydrogen-containing silicone intermediate, electronic chemical solvent
2. Physical and Chemical Properties
Physical Properties
- Appearance: Colorless transparent low-viscosity liquid
- Odor: Faint mild silicone solvent odor
- Solubility: Miscible with alkanes, ethers, toluene, xylene, acetone; slightly reacts with protic solvents such as methanol and water under catalyst
- Boiling Point: 70–72 °C (760 mmHg)
- Density (20 °C): 0.758–0.762 g/cm3
- Refractive Index nD20: 1.366–1.368
- Flash Point: -1 °C
- Hygroscopy: Non-hygroscopic
- Aqueous property: Stable in neutral cold water without catalyst; hydrolysis occurs under acid/alkali catalysis to produce hydrogen and silanol
Chemical Properties
- Molecular structure: Disiloxane backbone with two dimethylsilyl groups, contains two reactive Si-H bonds
- Hydrosilylation activity: Undergoes addition reaction with alkenes, alkynes under platinum catalyst to prepare functional silicone fluids, surfactants and coatings
- Hydrolysis characteristic: Si-H reacts with water, alcohol to release hydrogen gas; contact with strong base accelerates gas generation, risk of pressure buildup
- Thermal stability: Stable below 60 °C; high temperature above boiling point may trigger dehydrogenation and self-condensation
- Photostability: Good light resistance, no obvious discoloration under long-term light storage
- Compatibility: Compatible with non-protic organic solvents and silicone polymers; incompatible with water, alcohols, strong acid, strong alkali and oxidants
3. Main Application Fields
1. Hydrosilylation Synthetic Raw Material (Core Application)
Key monomer for synthesizing polyether modified silicone oil, amino silicone oil, fluorosilicone and crosslinkable silicone coatings
2. Electronic & Industrial Coating Additive
Low surface tension leveling agent for plastic, metal and glass silicone coating systems
3. Laboratory Organic Silicon Reagent
Reducing agent and silylation reagent for fine chemical and pharmaceutical intermediate synthesis
4. Foam Stabilizer Auxiliary
Raw material for low surface energy silicone foam stabilizer used in polyurethane production
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 3277-26-7 |
| Molecular Formula | C4H14OSi2 |
| Appearance | Colorless clear liquid without suspended impurities |
| GC Purity | Synthetic Grade ≥99.0%, Electronic Grade ≥99.5% |
| Water Content (KF) | ≤0.05% |
| Chroma (APHA) | ≤10 |
| Si-H Content | Qualified |
| Heavy Metals (Pb) | ≤5 ppm |
| Packaging | Amber sealed steel can; bulk 200kg lined iron drum with nitrogen sealing |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 °C, isolated from water, alcohol, open flame and oxidants |
| Transportation Requirement | Flammable low-boiling silicone liquid, Class 3 flammable liquid transport standard, separate from corrosive and oxidizing goods |
| Shelf Life | 24 months under nitrogen sealed storage |
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