Heat sink paste, also known as thermal paste, thermal grease, or thermal compound, is a substance applied between a heat-generating electronic component (like a CPU, power transistor, or voltage regulator) and a heat sink. Its primary purpose is to improve thermal conductivity between the two surfaces.
🔧 Why is Heat Sink Paste Used?
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Fills Microscopic Gaps: Even polished surfaces have tiny imperfections. These air gaps are poor conductors of heat. Thermal paste fills these gaps, allowing heat to transfer more efficiently.
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Improves Cooling Efficiency: By enhancing heat transfer, it helps keep the component temperature lower, which improves performance and extends the component’s lifespan.
🔬 Composition:
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Typically made of:
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Thermally conductive fillers: such as metal oxides (zinc oxide, aluminum oxide, or silver particles).
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A base matrix: often silicone-based or synthetic oils.
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🛠️ Application:
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A small amount is applied in a thin layer between the component and the heat sink.
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Too much paste can act as an insulator, so proper application is important.
🧊 Where It’s Commonly Used:
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CPUs and GPUs in computers
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Power transistors and regulators
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High-power LED assemblies
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Amplifiers and industrial electronics
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