Silicone Bath Fluid
The advantages make PDMS fluid as excellent bath fluid
Wide temperature range, thermal stability, chemical inertness, low vapor pressure and excellent electrical insulation properties make Polydimethylsiloxane (PDMS) an excellent bath fluid in laboratory and industrial settings. It can be utilized in various ways:
- Direct Immersion Baths: PDMS is directly filled into a bath or container to create a controlled temperature environment. This is commonly used in laboratories for applications like:
- Calibration: PDMS with known viscosity is used to calibrate viscometers and rheometers.
- Temperature Control: PDMS baths are used to maintain precise temperatures for chemical reactions, biological experiments, and material testing.
- Thermal Shock Testing: Components or materials are subjected to rapid temperature changes in PDMS baths to assess their durability.
- Circulating Baths: PDMS is circulated through a closed system with a pump and heater/chiller. This allows for:
- Uniform Temperature Distribution: The circulating PDMS ensures even heating or cooling throughout the bath, minimizing temperature gradients.
- Increased Heat Transfer: The continuous flow of PDMS enhances heat transfer rates, making it suitable for applications requiring rapid temperature changes or high thermal loads.
- Specialized Baths: PDMS can be used in specialized baths designed for specific purposes, such as:
- Viscometer Baths: PDMS is used as a reference fluid in viscometer baths for accurate viscosity measurements.
- Rheometer Baths: PDMS serves as a temperature-controlled medium in rheometer baths for measuring the flow and deformation properties of materials.
Silicone bath fluid selection guide
When polydimethylsiloxane (PDMS) is used as a silicone bath fluid, the choice of viscosity primarily depends on the application scenario and the desired temperature range:
Temperature Range:
- Low-temperature applications (-50°C to 100°C): Low viscosity PDMS, such as 10 cSt or lower, is typically chosen. Low viscosity PDMS exhibits better fluidity at low temperatures, facilitating heat transfer.
- Medium-temperature applications (100°C to 200°C): Medium viscosity PDMS, such as 50 cSt to 100 cSt, can be selected.
- High-temperature applications (above 200°C): High viscosity PDMS, such as 350 cSt or higher, is recommended. High viscosity PDMS is more stable at high temperatures and has lower evaporation loss. Alternatively, using phenyl silicone oil, which introduces phenyl groups into the molecular chain of dimethyl silicone oil, can significantly improve its thermal resistance.
Application Scenarios:
- Calibration: When calibrating viscometers and rheometers, PDMS standard fluids with specific viscosities are usually required to meet calibration requirements.
- Temperature control: In constant temperature baths or circulators, medium viscosity PDMS (50-100 cSt) is a common choice due to its good heat transfer properties and temperature stability.
- Thermal shock testing: PDMS of different viscosities can be selected based on the test requirements. Low viscosity PDMS is suitable for tests that require rapid temperature changes, while high viscosity PDMS is suitable for tests that require longer temperature stability.
- Other applications: In other applications, such as lubrication and coating, the appropriate PDMS viscosity should be selected based on specific requirements.
The following table summarizes the flash and pour point of our pure PDMS fluid for the selection of suitable viscosity:
| Viscosity (cSt) | Flash Point (℃) | Pour Point (℃) | Volatile Content % (150℃) |
|---|---|---|---|
| 5 | 134 | -100 | - |
| 10 | 211 | -100 | - |
| 20 | 246 | -84 | 0.45 |
| 50 | 318 | -70 | 0.3 |
| 100 | 326 | -65 | 0.02 |
| 200 | 326 | -65 | 0.07 |
| 350 | 326 | -50 | 0.15 |
| 500 | 326 | -50 | 0.11 |
| 1000 | 326 | -50 | 0.11 |
Synonyms:
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