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 (PDMS), CAS 63148-62-9, also known as dimethicone or methyl silicone oil, is a clear silicone polymer fluid supplied for industrial lubrication, release, defoaming and surface-treatment applications. Confirm the required viscosity and specification, then request a quotation with COA/TDS/SDS for bulk supply.

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

Polydimethylsiloxane (PDMS), CAS 63148-62-9, also called dimethicone or methyl silicone oil, is a clear, odorless silicone polymer fluid.

Synonyms: Dimethylpolysiloxane; Dimethicone; Methyl silicone oil; Poly(dimethylsiloxane).

CAS: 63148-62-9.

It has the repeating-unit formula (C2H6OSi)n.

It is thermally stable with low surface tension, water repellency, lubricity and low chemical reactivity.

It has a kinematic viscosity of 10,000 cSt at 25°C in the standard industrial grade.

It has a surface tension of about 20–22 mN/m and is insoluble in water.

It forms a strong lubricating and release film.

It is used as a mold release and demolding aid for rubber, plastics and composites.

It is used as a light mechanical lubricant and anti-wear film.

It is used as a defoamer base fluid in antifoam formulations.

It is used as a water-repellent and surface-treatment fluid for textiles, leather, paper and mineral surfaces.

It is used as a process aid in rubber compounding and plastics processing to improve flow and reduce sticking.

It is used as a polishing and slip additive in certain coatings and maintenance products.

Confirm appearance, odor, viscosity, density, refractive index, flash point, pour point, volatility, solubility and surface tension.

Store sealed in original containers in a cool, dry, well-ventilated place, away from moisture and direct sunlight.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required viscosity and specification, quantity, packaging, destination and document needs.

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.

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