Dimethylcyclosiloxane (DMC) CAS Number: 556-67-2

CAS No. 556-67-2

Chemical ingredients [(CH3)2SiO]x (x=3, 4, 5, 6)

Boiling point ≥135°C

Density(P20)g/cm3 0.95±0.02

Mass fraction of cyclo matter ≥99.50%

Mass fraction of hexamethyldisiloxane ≤0.01%

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;

Specification:

Items	Standard
Dimethylsiloxane Cyclics Mixture (%)	99.5 Min.
Chroma/ Platinum-cobalt scale (Hazen)	10 Max.
Refractive index n_D²⁰	1.3960～1.3970
Acidity (According to HCL) (%)	0.001 Max.
Hexamethyldisiloxane (%)	0.01 Max.
Appearance	Colorless Transparent Oily Liquid

HS Code: 2931909001

CAS No.: 556-67-2

UN No.: 1993

Hazardous Grade: 3

Package type: III

● Packages:

190kg metal Drum

Handling

1. Avoid breathing vapors or mist.

2. Avoid contact with skin, eyes, and clothing.

3. Use in a well-ventilated area with adequate 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/bond containers during transfer to prevent static discharge.

7. Do not eat, drink, or smoke while handling.

8. Wash thoroughly after handling.

9. 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, or moisture.

7. Follow local regulations for storage of flammable liquids (if applicable to grade).

APPLICATION SCENARIOS

1. Silicone Polymer Manufacturing (Primary Application)

DMC undergoes controlled ring-opening polymerization (ROP) to produce:

Silicone fluids (PDMS)

Silicone elastomers (RTV / HTV)

Silicone rubber

Silicone sealants

Silicone resins

Silicone emulsions

It functions as the key transitional intermediate between chlorosilane hydrolysis and finished silicone polymers.

2. Silicone Fluids and Functional Materials

DMC-derived PDMS is widely applied as:

Industrial lubricants

Defoaming agents

Release agents

Hydraulic and dielectric fluids

Thermal management fluids

Core attributes: low surface tension, thermal stability, chemical inertness, broad service temperature range.

3. Personal Care Applications (D4 / D5)

Low-viscosity cyclic siloxanes are directly used as:

Volatile carrier fluids

Sensory modifiers in skin and hair formulations

Conditioning agents

Key benefits: rapid spreading, smooth sensory profile, controlled volatility.

4. Elastomers and Sealants

DMC-based polymers are essential in:

Construction sealants

Automotive gasketing

Electronic encapsulation

Industrial molding materials

They provide durability, flexibility, and environmental resistance.

5. Coatings and Surface Treatment

Through silicone resin and fluid systems, DMC contributes to:

Heat-resistant coatings

Water-repellent systems

Corrosion protection

Electrical insulation materials

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Vietnam
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