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- Applications
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- Application Details
- WACKER® PASTE P 12 is used especially in semiconductor technology as a heat sink paste. Wherever it is important to have good heat transfer from a semiconductor to a cooling element, it is advisable to apply a thin coating of WACKER® PASTE P 12. In the assembly of semiconductors, e. g. diodes, transistors and thyristors, microscopic irregularities may exist on the mating surfaces of the semiconductor and the cooling surface. When assembled, a firm metal-to-metal contact might be hampered by these surface irregularities. A significant percentage of the device's surface therefore might lack direct contact to the heatsink. Remaining gaps are filled with air, providing relatively poor thermal conductivity.
- By coating the contact surfaces with WACKER® PASTE P 12, surface irregularities will be filled with the heat sink silicone paste. The thermal conductivity of WACKER® PASTE P 12 is about 20 times better than that of air. Practical experience has shown that by using WACKER® PASTE P 12, the heat transfer resistance from the semiconductor housing to the cooling elements is reduced by 50 %.
Processing
The product can be applied with a brush, spatula or by screen printing. Best results are achieved when a uniform, thin coating is applied to the mating surfaces. Excess paste that's squeezed during assembly should be removed.
Properties
- Color
- Physical Form
- Typical Properties
Value Units Test Method / Conditions Bleeding (at 30hours, 200°C) max. 0.4 % FED-STD 791 M 321 Density (at 23°C) 2.1 g/cm³ DIN EN ISO 1183-1 A Dielectric Strength 10 kV/mm IEC 60243-1 Dissipation Factor (tan δ, at 50Hz) 9 x 10⁻³ - IEC 62631-2-1 Loss of Weight (at 200°C, 30 hours) max. 1.2 % FED-STD 791 M 321 Operating Temperature -40 to - 200 °C - Penetration (unworked, measured after 24hours dwell time; 150g cone, 5s penetration time) 19.4 - 23.8 mm DIN ISO 2137 Permittivity (at 50Hz) 3.5 - IEC 62631-2-1 Solidification Point approx. -45 °C - Thermal Conductivity 0.6 - 0.8 W/m.K ASTM D 5470-12 - Properties
Thermally conductive
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Storage & Handling
- Storage Information
Store in a dry and cool place.