LOCTITE TC4
Harmonization Code : 3403.19 | Lubricating Preparations (With 70% or More Petroleum Oils) For Automotive and Other Uses
Main features
- Thermally Conductive Lubrication
- High Insulation Resistance
- High Dielectric Strength
Product Description
LOCTITE® TC 4 is a silicone-based thermal grease designed to provide efficient heat transfer between heat-generating electronic components and heat-dissipating structures. The material offers high thermal conductivity, high insulation resistance, and high dielectric strength while maintaining a stable paste-like consistency even after prolonged exposure to elevated temperatures. It is widely used in thermal management applications involving semiconductors, power electronics, thermostats, and heat sinks.
Key Features & Benefits
- High thermal conductivity for efficient heat transfer.
- High insulation resistance.
- High dielectric strength.
- Maintains paste consistency during long-term high-temperature exposure.
- Provides corrosion protection on mating surfaces.
- Suitable for electronic thermal management systems.
- Easy application by brush, syringe, cartridge, or dispensing equipment.
Recommended Applications
- Heat sinks in semiconductor devices.
- Thermoelectric devices and radiators.
- Thermostat mounting surfaces.
- Power resistors mounted on chassis.
- General electronic heat-transfer interfaces.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
White
Appearance at room temperature.
Specific Gravity
2.35
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.
Thermal Properties
Thermal Conductivity
0.6 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
19.7 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.
Additional Information
Technical Properties
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Technology | Silicone Grease | — | Thermal management compound |
| Appearance | White | — | As supplied |
| Density | 2.35 | g/cm³ | Typical value |
| Shelf Life | 365 | days | 18 to 25°C storage |
| Operating Temperature Range | -40 to +200 | °C | Continuous service |
| Application Type | Thermal Management | — | Heat transfer interface material |
Technical Properties
After-Processing / Final-State Properties
| Property | Value | Unit | Condition / Method |
|---|---|---|---|
| Thermal Conductivity | 0.6 | W/(m·K) | Typical cured property |
| Hardness | 20 - 25 | Shore A | Physical property |
| Dielectric Strength | 19.7 | kV/mm | Electrical property |
| Volume Resistivity | 1 × 10¹³ | Ω·cm | Electrical property |
| High Temperature Stability | Excellent | — | Will not harden after prolonged heat exposure |
| Heat Transfer Efficiency | High | — | Electronic thermal interface applications |
| Electrical Insulation | High | — | High insulation resistance and dielectric strength |
