DOWSIL 710
Harmonization Code : 3403.19 | Lubricating Preparations (With 70% or More Petroleum Oils) For Automotive and Other Uses
Main features
- Up to 260 deg C Closed-System Service
- Low-Volatility Oxidation-Resistant Fluid
- High-Temperature Lubrication/Heat-Transfer Applications
Product Description
DOWSIL™ 710 Fluid is a polyphenylmethylsiloxane fluid for high-temperature lubrication and heat-transfer applications. It retains its properties during continuous use at temperatures up to 260° C in closed systems and combines low volatility with resistance to oxidation and gumming. The fluid is suitable for lubricating timing devices, instruments, and bearings operating from 0 to 260 °C. It may also be used as a base oil for high-temperature greases thickened with molybdenum disulphide and as a heat-exchange fluid in high-temperature baths and metal heat-treating baths.
Key features
- High-temperature stability: Retains its properties during continuous use at temperatures up to 260 °C in closed systems.
- Low volatility: Shows 3.0% volatility after four hours at 250 °C and has negligible vapor pressure at 25 °C.
- Oxidation and radiation resistance: Resists oxidation and gumming and remains serviceable after radiation doses of up to 200 megarads at room temperature.
Applications / Suitable for
- Timing devices, instruments, and bearings operating from 0 to 260 °C
- Base oil for high-temperature greases thickened with molybdenum disulphide
- High-temperature heat-exchange baths
- Metal heat-treating baths
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Color
Colorless to light straw
The color
Refractive index
1.533
The refractive index determines how much the path of light is bent, or refracted, when entering a material. It is calculated by taking into account the velocity of light in vacuum compared to the velocity of light in the material.
The refractive index calculation can be affected by the wavelength of light and the temperature of the material. Even though it is usually reported on standard wavelengths it is advised to check the TDS for the precise test parameters.
Specific Gravity
1.11
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
Surface Tension
28.5 mN/m
Thermal Properties
Flash Point
302 °C
The flashpoint of a solvent is the lowest possible temperature at which it can vaporize to form an ignitable vapor.
Flashpoint is often confused with “autoignition temperature”, which is the temperature at which a solvent ignites without an ignition source.
Thermal Conductivity
0.14 W/m.K
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.
Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
Electrical Properties
Dielectric Strength
14 kV/mm
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material.
Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property.
As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
Volume Resistivity
1E13 Ohms⋅cm
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
Additional Information
Technical properties
As-supplied / before-processing properties
Typical properties of DOWSIL™ 710 Fluid. These values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Colorless to light straw | — | As supplied |
| Viscosity | 500 | mm²/s | At 25°C |
| Specific gravity | 1.11 | — | At 25°C/15.6°C |
| Flash point | 302 | °C | Open cup |
| Volatility | 3.0 | % | After 4 hours at 250°C |
| Vapor pressure | Negligible | kPa | At 25°C |
| Vapor pressure | 0.01 | kPa | At 149°C |
| Vapor pressure | 0.2 | kPa | At 232°C |
| Vapor pressure | 0.5 | kPa | At 260°C |
| Vapor pressure | 1.3 | kPa | At 288°C |
| Vapor pressure | 2.9 | kPa | At 316°C |
| Vapor pressure | 11.0 | kPa | At 371°C |
| Thermal decomposition point | 370 | °C | Typical value |
| Spontaneous ignition temperature | 488 | °C | Typical value |
| Freeze point | -22 | °C | Typical value |
| Coefficient of expansion | 0.00072 | 1/°C | From 0°C to 135°C |
| Sound velocity | 1370 | m/s | At 25°C |
| Compressibility | 1.70 | % | At 34.5 MPa |
| Compressibility | 3.15 | % | At 69 MPa |
| Compressibility | 5.50 | % | At 138 MPa |
| Thermal conductivity | 0.14 | W/(m·K) | At 50°C |
| Specific heat | 1.52 | kJ/(kg·K) | At 40°C |
| Specific heat | 1.64 | kJ/(kg·K) | At 100°C |
| Specific heat | 1.84 | kJ/(kg·K) | At 200°C |
| Molecular weight, average | 2600 | — | Average value |
| Refractive index | 1.533 | — | At 25°C |
| Surface tension | 28.5 | mN/m | At 25°C |
| Electric strength | 14 | kV/mm | 2.5 mm gap; rapid rise |
| Permittivity | 2.95 | — | At 25°C and 100 Hz |
| Permittivity | 2.95 | — | At 25°C and 100 kHz |
| Dissipation factor | 0.002 | — | At 25°C and 100 Hz |
| Dissipation factor | 0.0002 | — | At 25°C and 100 kHz |
| Volume resistivity | 1 × 1013 | ohm·cm | Typical value |
