SILISIL Silicone Oil 300 cSt
SILISIL Silicone Oil 300 cSt — medium-viscosity PDMS silicone oil.
SILISIL Silicone Oil 300 cSt — medium-viscosity polydimethylsiloxane (PDMS).
Universal all-purpose product for industrial silicone oils. Density 0.97 g/cm³, flash point >300 °C. Shipped from our Swiss warehouse with SDS and TDS.
SILISIL Silicone Oil 300 cSt — Medium-viscosity PDMS silicone oil
SILISIL Silicone Oil 300 cSt is a pure, medium-viscosity polydimethylsiloxane (PDMS)—the standard all-rounder among industrial silicone oils. It combines chemical inertness, thermal stability, and excellent dielectric properties with balanced flow characteristics, thus forming the basis for numerous formulations and direct applications in industry, electrical engineering, and surface technology.
Key features
| Viscosity at 25 °C | 300 cSt (300 mPa·s) |
| Density at 25 °C | 0.97 g/cm³ |
| Flash point (open cup) | >300 °C |
| pour point | -50 °C |
| surface tension | 21.0 mN/m |
| Polymer type | Polydimethylsiloxane (PDMS), linear |
All other properties (refractive index, thermal conductivity, dielectric properties, etc.) are listed as structured product attributes on this page and can be filtered in the shop. Please refer to the technical data sheet (TDS) in the documents section for the official values.
product benefits
- Wide range of applications, from the laboratory to mass production
- Excellent thermal and oxidative stability
- Excellent dielectric properties — even under long-term stress
- Low temperature dependence of viscosity
- Chemically inert and physiologically harmless
- Low surface tension for reliable separation
- Easy to clean, colorless and odorless
Typical Applications by Industry
- Transformers and Switchgear: Dielectrics and Heat Transfer Fluids in Dry-Type Transformers, Relays, and High-Voltage Switchgear
- Rubber and Plastics Industry: Internal Lubrication and Release Agents in Injection Molding, Vulcanization, and Extrusion
- Surface Technology: Additives in Polishes, Impregnating Agents, and Water-Repellent Coatings
- Thermal Systems: Heat transfer fluid in closed industrial heating circuits and laboratory thermostats
- Defoamers: A base for industrial antifoam compounds in aqueous and mineral oil-based systems
- Sealing Technology: Lubricants and Impregnating Agents for Flange Gaskets, O-Rings, and Bellows
Processing and Compatibility
- Compatible with most organic solvents (aromatic and aliphatic hydrocarbons, ethers, esters)
- Emulsifiable using standard emulsifiers and techniques (rotor-stator, high-pressure homogenization)
- Typical dosage as a surface additive: 0.1–1%
- In formulated or cosmetic products: 1–10%, depending on the formulation
- Inmiscible with water and highly polar solvents (methanol, glycerin)
Storage, Handling, and Shelf Life
- Store in original containers, in a dry place, protected from direct sunlight, at temperatures below 60 °C
- Unopened products typically remain stable for years—the exact shelf life is specified in the TDS
- Close tightly after opening to prevent moisture from entering
- Avoid eye contact — mandatory information in the safety data sheet (SDS)
Available sizes
- 1 kg bottle (sample bottle)
- 5-kg canister
- 25-kg canister
- 200-kg drum
- 1,000 kg IBC (upon request)
SILISIL Silicone Oil 300 cSt is packaged and tested by SILITECH AG in Switzerland and shipped from our Swiss warehouse. Every batch is traceable; we provide batch certificates upon request. Our silicone specialists are always available to assist you in selecting the appropriate viscosity or with formulation development.
Frequently Asked Questions About SILISIL Silicone Oil 300 cSt
The most important answers regarding applications, features, and availability.
SILISIL Silicone Oil 300 cSt is a medium-viscosity polydimethylsiloxane and is particularly suitable as an insulating and heat transfer fluid in transformers and switchgear, as a release agent in plastics and rubber processing, as a base for active ingredients in polishes and impregnating agents, and as a component in industrial defoamers.
The unique feature of SILISIL Silicone Oil 300 cSt is its combination of high thermal stability, excellent dielectric properties, and chemical inertness. Medium-viscosity PDMS oils are the standard all-purpose solution in industry—they are equally suitable as heat transfer fluids, release agents, and formulation bases. The exact specifications—in particular viscosity (300 cSt), density (0.97 g/cm³), flash point (>300 °C), and pour point (-50 °C)—are also listed as product attributes and can be filtered in the shop.
Yes. SILISIL Silicone Oil 300 cSt is an excellent electrical insulator with a dielectric strength of approximately 14 kV/mm, a dielectric constant of approximately 2.7, and a specific volume resistivity in the order of 10¹⁵ Ω·cm. This makes the product particularly suitable for dielectric and electronic impregnation applications.
SILISIL Silicone Oil 300 cSt is available from our Swiss warehouse in standard sizes of 1 kg, 5 kg, 25 kg, 200 kg, and 1,000 kg. Other sizes and packaging options are available upon request to meet customer specifications—we provide a free sample for preliminary testing.
Consulting, Samples, and Project Quotes
Not sure which viscosity to choose or how to use the product? Our silicone specialists at SILITECH are here to advise you—with no obligation—on both technical and pricing matters. For preliminary testing, we also provide sample quantities and small-volume fillings upon individual agreement. Submit a request now.
product specifications
| Physical properties | |
|---|---|
| Paint cured | Transparent |
| product information | |
|---|---|
| container | 1 kg or 5 kg or 25 kg |
| brand | SILISIL |
| network type | Not reactive |
| product approvals | |
|---|---|
| Certificates | RoHS or REACH |
| food contact | No |
| Suitable for medical use | No |
| Areas of application | |
|---|---|
| Main application | Electronics potting or Seals & joints or Release agents |
| Electrical Properties | |
|---|---|
| Electrical insulation | Yes |
| Uncategorized | |
|---|---|
| Viscosity (cSt) | 300 cSt |
| Density (g/cm³) | 0.970 g/cm³ |
| Flash point (°C) | >300 °C |
| Freezing point (°C) | -50 °C |
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