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Thermally Conductive Phase Change Material

PAKCOOL®

    基本性能:

  • Excellent Thermal Conductivity – Thermal conductivity 3.0 W/m·K, effectively reducing interfacial thermal resistance.

  • Intelligent Phase-Change Compliance – Softens automatically at around 40–50 °C to fully fill micro-gaps between heat source and heatsink.

  • Excellent Interfacial Wettability – After phase change, the surface becomes tacky, ensuring intimate contact with both thermal surfaces.

  • Long-Term Reliability – Excellent resistance to pump-out, high & low temperature, and humidity aging.

  • Electrical Insulation & Safety – Electrically insulating formulation suitable for high-density electronic modules.

  • Process Versatility – Compatible with multiple assembly methods such as screen printing, die-cutting, and automated placement.

    应用:

  • Ideal for active cooling devices and other electronic applications demanding low thermal resistance and long-term reliability.

PAKCOOL® Thermally Conductive Phase Change Pad Specification

Product Name Appearance Thermal Conductivity（W/m·K） Phase transition temperatu（℃） Viscosity（cP） Thermal Impedance@20psi（K-in2/W） BLT（um） Density（g/cm³） File
PC-5430 White/Gray paste ＞3.5 44±2/65±2 200,000-400,000 ≤0.01 15 2.76±0.02 PC-5430



PAKCOOL® Thermally Conductive Phase Change Pad Specification

Product Name Color Thermal Conductivity（W/m·K） Thermal Impedance@20psi,0.5mm（K-in2/W） Thickness（mm） Density（g/cm³） Hardness@25℃（Shore OO） Phase Transition Temperature（℃） Volume Resistivity（Ω·cm） File
PC-7630 Gray 3.0±0.1 0.34 0.3-5.0 2.95±0.05 50±10 42-52 ≥2.0×1013 PC-7630


Packaging Specifications for PAKCOOL®Thermally Conductive Phase Change Paste


    PAKCOOL®PC-54xx series is offered in a 1Kg, 5Kg and 20Kg barrel or 330mL, 55mL tube or customizable according to customer requirements.

Operating Guide for PAKCOOL® Thermally Conductive Phase Change Paste

Operating Guide
1. Preparation and Storage Before Use: Thermally conductive grease can be stored at 2-8℃ for approximately 12 months. Before use, acclimate the product at 25°C for at least 4 hours to ensure the material reaches the ambient usage temperature.
2. Application Method and Process:    The interface surfaces should be cleaned with alcohol to remove dust before thermal grease is applied on the surface.
         During application, use a screen-printing process.After the material is applied between the component and the heat sink, it should be placed under appropriate drying conditions to cure into a solid phase-change layer, ensuring optimal thermal performance. For best results, the thinner the paste layer, the lower the interfacial thermal resistance, provided the interface gap is fully filled. 

3. Unused Products:    Any unused material should be tightly sealed for future use.


Typical Drying Conditions：For example, with a coating thickness of 0.025 mm (see table below) The below drying profile is a guideline recommendation. Conditions (time and temperature) may vary based on customer’s experience and their application requirements, as well as customer’s drying equipment, oven loading and actual oven temperatures.
Temperature Time
25°C 48 h
70°C 60 min
150℃ 10 min
Precautions
  • 1. 1. This product is volatile; proper protection and well-ventilated usage environments are required.
  • 2. 2. Viscosity varies with the temperature, it's recommended to use in constant temperature conditions.
  • 3. 3. Please refer to the product's Material Safety Data Sheet (MSDS) for safety details.

    • Process Characteristics of PAKCOOL® Thermal Conductive Phase Change Paste





    Screen Printing Process

             The material used for screen meshes is typically nylon. The thickness of the coating applied during the screen printing process is related to the mesh count of the screen. A lower mesh count means a larger diameter of the mesh openings, which results in a thicker coating under the same printing conditions. The table below illustrates how different mesh counts correspond to different coating thicknesses:

    Mesh Count Mesh Thickness(mm) Coating Thickness(mm)
    60 0.21 0.135~0.145
    80 0.20 0.12~0.15
    110 0.15 0.09~0.10

    Packaging Specifications for PAKCOOL® Thermally Conductive Phase Change Pad


        PAKCOOL®PC-76xx Series Thermally Conductive Phase Change Pads are adhesive-free and can be cut to size according to customer requirements.

    PAKCOOL® Thermal Conductive Phase Change Pad offers excellent stress-buffering capability


        The hardness–temperature curve demonstrates that PAKCOOL® PC-7630 undergoes a distinct phase-change softening within its operating temperature range, where hardness drops sharply.
This behavior allows the material to soften automatically during device operation, conforming tightly to the interface and significantly reducing microscopic air gaps and contact thermal resistance.
Upon cooling, the material reverts to a solid state, maintaining dimensional stability and structural integrity without flowing or bleeding.
This reversible “softening on heating – solidifying on cooling” characteristic is the key distinction between phase-change pads and conventional elastomeric thermal pads


PAKCOOL® Thermally Conductive Phase Change Pad delivers ultra-low thermal resistance



       

The thermal resistance–pressure curve indicates that as pressure increases, the interface contact becomes more intimate, micro-voids are compressed, and thermal resistance decreases significantly.

PC-7630 maintains extremely low thermal resistance even under typical assembly pressures, demonstrating outstanding conformability and thermal performance.

This also highlights the product’s high compliance and excellent compression response, making it ideal for module clamping and pressure-mounted assembly processes.



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