What is Polydimethylsiloxane PDMS CAS 63148-62-9?

Polydimethylsiloxane PDMS CAS 63148-62-9 is a clear, odorless silicone polymer fluid made from repeating dimethylsiloxane units. It is also known as dimethicone or methyl silicone oil and is valued for thermal stability, low surface tension, water repellency, lubricity, and low chemical reactivity.

What does the 10,000 cSt viscosity grade mean?

The 10,000 cSt value is the kinematic viscosity at 25 deg C and reflects the polymer chain length and molecular weight. This high-viscosity grade forms a strong lubricating and release film, so it is selected for applications needing longer-lasting slip, damping, or surface protection rather than a thin penetrating fluid.

Is PDMS silicone oil the same as dimethicone?

Yes, in most supplier listings polydimethylsiloxane, dimethylpolysiloxane, dimethicone, and methyl silicone oil refer to the same polymer family under CAS 63148-62-9. The chosen INCI or trade name depends on the industry, but the silicone backbone and CAS number are the same.

What industrial applications is this PDMS fluid used for?

This industrial-grade PDMS is used as a mold release agent, light mechanical lubricant, defoamer base, rubber and plastic processing aid, and hydrophobic surface-treatment fluid. It is also suitable as a base for specialty silicone formulations where low volatility and high thermal stability are required.

Is Polydimethylsiloxane water-soluble?

No, PDMS is insoluble in water and instead forms a hydrophobic film with low surface tension, typically around 20-22 mN/m. It is generally compatible with many non-polar organic solvents, but compatibility should be checked for the specific final formulation.

Polydimethylsiloxane (PDMS) CAS 63148-62-9

Polydimethylsiloxane, identified by CAS 63148-62-9, is a high-stability silicone polymer characterized by a repeating inorganic siloxane backbone with organic methyl side groups. Octamethylcyclotetrasiloxane (D4) is a cyclic siloxane intermediate used in PDMS-chain production. As a versatile polydimethylsiloxane, this technical-grade dimethylpolysiloxane functions as a primary hydrophobic agent and thermal stabilizer in various industrial lubricant formulation processes. This linear methyl silicone oil is valued for its low surface tension, high dielectric strength, and excellent shear resistance across extreme temperature gradients. Our facility provides competitive factory pricing and customized specifications regarding viscosity centistokes to ensure compatibility with specific mechanical or chemical systems. For technical validation and safety compliance, we offer comprehensive MSDS, TDS, COA documentation and maintain consistent bulk supply for global industrial distribution.

CAS: 63148-62-9
Synonyms: Dimethylpolysiloxane, Dimethicone, Methyl silicone oil, Poly(dimethylsiloxane)
Einecs: 613-156-5
Molecular Formula: (C₂H₆OSi)ₙ
Grade: Industrial Grade
Package: 25 kg pail / 200 kg drum / 1000 kg IBC (customizable)

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Product Description

This PDMS silicone fluid is a clear, odorless, chemically stable polymer with excellent thermal resistance, water repellency, and lubricity. The 10,000 cSt viscosity grade provides strong film-forming and slip performance, making it suitable for industrial lubrication, mold release systems, rubber/plastics processing, and surface treatment formulations where long-lasting smoothness and low reactivity are required.

1 Physicochemical Properties (Typical)

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties (Typical)

Item	Specification / Typical Value
Chemical name	Polydimethylsiloxane (PDMS)
CAS	63148-62-9
Appearance	Colorless to light-yellow transparent liquid
Odor	Odorless / mild
Viscosity (25°C)	10,000 cSt (typical)
Density (25°C)	~0.965–0.980 g/cm³
Refractive index (25°C)	~1.402–1.405
Flash point	> 300°C (typical)
Pour point	approx. -30°C to -40°C (typical)
Volatility	Low
Solubility in water	Insoluble
Solubility in organic solvents	Generally soluble in many non-polar solvents (compatibility test recommended)
Surface tension (25°C)	~20–22 mN/m (typical)

Applications

Mold release / demolding aid for rubber, plastics, and composite processing
Industrial lubricant / anti-wear film for light mechanical lubrication needs
Defoamer base fluid (as a silicone carrier in antifoam formulations)
Water-repellent & surface treatment for textiles, leather, paper, and mineral surfaces
Process aid in rubber compounding and plastics processing to improve flow and reduce sticking
Polishing / slip additive in certain coatings and maintenance products (compatibility check recommended)

For related silicone-fluid options, see Dimethicone and Hydrogen Silicone Oil.

Storage Conditions

Store in sealed original containers in a cool, dry, well-ventilated place.
Keep away from strong oxidizers and strong acids/alkalis.
Recommended storage temperature: 5–35°C.
Avoid moisture contamination, dust, and prolonged direct sunlight.
Typical shelf life: 12 months under proper storage (subject to batch/packaging).

Safety Precautions

Avoid contact with eyes and prolonged skin exposure; wear gloves and safety goggles during handling.
Use adequate ventilation when processing at elevated temperature.
Spills may create slip hazards—clean immediately with suitable absorbents.
Dispose according to local regulations; do not discharge large quantities into drains.
SDS can be provided upon request.

FAQ - Technical & Supply Chain

Q:
What is Polydimethylsiloxane PDMS CAS 63148-62-9?

A: Polydimethylsiloxane PDMS CAS 63148-62-9 is a clear, odorless silicone polymer fluid made from repeating dimethylsiloxane units. It is also known as dimethicone or methyl silicone oil and is valued for thermal stability, low surface tension, water repellency, lubricity, and low chemical reactivity.
Q:
What does the 10,000 cSt viscosity grade mean?

A: The 10,000 cSt value is the kinematic viscosity at 25 deg C and reflects the polymer chain length and molecular weight. This high-viscosity grade forms a strong lubricating and release film, so it is selected for applications needing longer-lasting slip, damping, or surface protection rather than a thin penetrating fluid.
Q:
Is PDMS silicone oil the same as dimethicone?

A: Yes, in most supplier listings polydimethylsiloxane, dimethylpolysiloxane, dimethicone, and methyl silicone oil refer to the same polymer family under CAS 63148-62-9. The chosen INCI or trade name depends on the industry, but the silicone backbone and CAS number are the same.
Q:
What industrial applications is this PDMS fluid used for?

A: This industrial-grade PDMS is used as a mold release agent, light mechanical lubricant, defoamer base, rubber and plastic processing aid, and hydrophobic surface-treatment fluid. It is also suitable as a base for specialty silicone formulations where low volatility and high thermal stability are required.
Q:
Is Polydimethylsiloxane water-soluble?

A: No, PDMS is insoluble in water and instead forms a hydrophobic film with low surface tension, typically around 20-22 mN/m. It is generally compatible with many non-polar organic solvents, but compatibility should be checked for the specific final formulation.

Ordering & Documentation

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