Wechat Code
Octamethylcyclotetrasiloxane (D4) (OMCTS)
CAS No. 556-67-2
Molecular Formula C8H24Si4O4
Molecular Weight 296.63
Melting point 17.5°C
Boiling point 175°C
Flash point 56 °C
Density ((P20, g/cm3) 0.956
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 |
| Content (%) | 99.0 Min. |
| Viscosity: (25°C): | 2.30mm2/s |
| Refractive index: (n D25): | 1.3960-1.3970 |
| Water Solubility | Insoluble |
| Properties | Colorless transparent oily liquid, flammable |
HS code: 2931900001
CAS No.: 556-67-2
EINECS: 209-136-7
UN : 1993
Hazardous Grade: 3
Packing Type: III
● Packages:
in 190kgs plastic coated metal drum or 950kg IBC
Features
Chemical Name: Octamethylcyclotetrasiloxane
Abbreviation: D4
Appearance: Colorless, transparent liquid
Boiling Point: ~175°C
Density: ~0.95 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 in a well-ventilated area with adequate local exhaust ventilation.
4. Wear appropriate 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 combustible liquids.
1. Silicone Polymer Manufacturing (Principal Application)
D4 undergoes controlled ring-opening polymerization (ROP) to produce:
Silicone fluids (PDMS oils)
Silicone elastomers (RTV, HTV, LSR)
Silicone rubber
Silicone sealants
Silicone emulsions
Silicone resins
It is the most widely used monomer for viscosity-controlled PDMS production.
2. Silicone Fluids & Industrial Functional Materials
D4-derived PDMS is applied in:
Industrial lubricants
Defoaming agents
Release agents
Hydraulic and dielectric fluids
Thermal management fluids
Key properties: low surface tension, thermal stability, oxidation resistance, chemical inertness.
3. Elastomers and Sealants
D4-based polymers are essential in:
Construction sealants
Automotive gasketing systems
Electronic encapsulation and potting
Industrial molding materials
They provide flexibility, durability, weather resistance, and electrical insulation.
4. Coatings and Surface Treatment
Through resin and fluid systems, D4 contributes to:
Heat-resistant coatings
Water-repellent treatments
Anti-corrosion systems
Electrical insulation coatings
5. Silicone Emulsions & Textile Applications
D4-derived emulsions are used in:
Textile softeners
Fabric water repellents
Leather finishing agents
OUR MARKET
Up till now we’ve developed and supplied to many countries and areas all over the world, with main markets in European countries (Germany, Italy, UK, Spain, Ukraine, Russia, Poland, etc.), USA, South America, Mid East, South-east Asia, Australia, etc. Also seeking more strategic partners and customers under mutual benefits and work through the whole purchasing chain.
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Vietnam
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India
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Belgium
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USA
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Czech Republic
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Mexico
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Colombia
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Singapore
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Ecuador
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Peru
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Russia
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Turkey
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Costa Rica
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Chile
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Indonesia
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Pakistan
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