Wechat Code
Hexamethylcyclotrisiloxane (D3)
CAS No. 541-05-9
Synonyms Hexamethylcyclo
Molecular Formula [(CH3)2SiO]3
Molecular Weight 222.46
Melting point 64.5°C
Boiling point 134°C
Flash point 35°C
Density ((P20, g/cm3) 1.12
20+ years supplying history;
No claims;
Good and stable quality; Stable supplying;
SGS testing approved; EMTEK, SRICI tested; ISO:90012/ 2015 certified, AAA Credit certified;
Delivery Time: 15-20 days;
Audit acceptable;
Competitive price;
Bigbags Packing; On pallets; IBC packing;
| Testing Item | Standard |
| Assay (%) | 98.0 Min |
| Content of Chloridion (mg/kg) | 50 Max. |
| Appearance | White Crystalline Lens |
HS code: 2931900001
CAS No.: 541-05-9
EINECS: 208-765-4
UN : 1325
Hazardous Grade: 4.1
Packing Type: II
● Packages:
125kg in 200L steel drum. 10T in 20’FCL.
Features
Chemical Name: Hexamethylcyclotrisiloxane
Abbreviation: D3
Appearance: Colorless, transparent liquid
Density: ~0.96 g/cm³ (at 25°C)
Solubility: Insoluble in water; soluble in organic solvents
Handling
1. Avoid breathing vapors or mist.
2. Avoid contact with skin, eyes, and clothing.
3. Use only in well-ventilated areas with appropriate exhaust ventilation.
4. Wear suitable PPE: chemical-resistant gloves, safety goggles/face shield, and protective clothing.
5. Keep away from heat, sparks, and open flames.
6. Ground and bond containers during transfer to prevent static discharge.
7. Avoid prolonged or repeated exposure.
8. Prevent spills and avoid environmental release.
Storage
1. Store in a cool, dry, well-ventilated place.
2. Keep container tightly closed when not in use.
3. Protect from heat and direct sunlight.
4. Keep away from strong oxidizing agents.
5. Store in original containers or approved storage tanks.
6. Avoid contamination with acids, bases, and moisture.
7. Follow local regulations for storage of flammable liquids (if applicable to grade).
1. Silicone Polymer Production
D3 undergoes cationic or anionic ring-opening polymerization (ROP) to form linear polydimethylsiloxane (PDMS).
Applications include:
Specialty silicone fluids
Low-viscosity PDMS synthesis
Controlled molecular weight silicone systems
Laboratory and customized polymer formulations
Although D4 is the primary industrial monomer, D3 is used in formulations requiring specific reactivity or structural control.
2. Siloxane Equilibration Intermediate
D3 participates in redistribution (equilibration) reactions with other cyclic siloxanes (D4/D5) to:
Adjust molecular weight distribution
Modify polymer chain architecture
Optimize viscosity profiles
It functions as a reactive regulator in silicone polymer manufacturing.
3. Specialty Silicone Materials
D3 serves as a precursor for:
Functionalized siloxanes
Crosslinkable silicone intermediates
Silicone resins and modified elastomers
Its higher ring strain enhances reactivity compared to larger cyclic siloxanes.
4. Research and Fine Chemical Applications
Due to its defined cyclic structure and reactivity, D3 is used in:
Polymer chemistry research
Mechanistic studies of siloxane polymerization
Development of advanced organosilicon materials
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