Thermal pads can be installed in CPUs, GPUs, battery systems, and similar components. If you need to install thermal pads for your product or replace existing ones but are unsure how to proceed, this article provides step-by-step guidance. Improper application of thermal pads can lead to misalignment, residue, and air bubbles, which can delay the production process. Knowing the process before the application will enhance your stick efficiency, avoid material wastage, and also maximize the thermal pad’s performance.
Step 1: Clean the Components and Heat Sink Surfaces
Cleaning before application is essential, as contaminants such as dust, stains, and moisture not only present higher thermal resistance and thermal impedance, impairing the thermal pad’s heat transfer efficiency, but also affect surface flatness. Therefore, you must ensure both the heat sink and component surfaces are clean. If you are replacing the thermal pad on your product, the old pad must be completely removed. You may select a safe cleaner(typically including isopropyl alcohol or Isoamyl acetate) as recommended and use a cotton swab to assist with cleaning.
Step 2: Cut the Thermal Pad
Suppliers will pre-cut thermal pads into sheets according to your requirements for ease of use. Consequently, their thickness is typically fixed. However, if your component has a more complex shape, you can request a custom design from your supplier or cut the thermal pad yourself based on the contact area and shape between the component and heat sink. It is advisable to obtain precise measurements using gauges or 3D drawings and make allowances before cutting. This prevents low heat transfer efficiency due to pads being smaller than the thermal contact area or excessive material wastage from oversized pads.
Step 3: Apply the Thermal Pad to the Component
Thermal pads typically feature protective liners on both sides to avoid contamination, deformation and overlaying during transport and storage. These can be easily removed without damaging the thermal pad. You should first peel off the protective film from one side, then align the thermal pad and adhere it to a clean component surface. Thermal pads are pliable, allowing you to use them firmly on the component surface with minimal pressure. Gently press the areas in contact with the component to prevent air pockets from forming.
Step 4: Install the Heat Sink or Outer Casing
After affixing the thermal pad to the component on the PCB, proceed to the next step. Remove the protective film from the opposite side of the thermal pad and align the heat sink or product housing before sticking it onto the thermal pad. Similarly, apply little pressure to make the thermal pad adhere to all surface irregularities. It should be noted that most thermal pads require additional mechanical fastening (such as screws, clamps, etc.) to achieve stability throughout the thermal pad’s lifespan. Whilst some thermal pads permit the addition of an adhesive layer, mechanical fastening is necessary in high-temperature applications and those subject to operational vibration.
Step 5: Inspection and Testing of the Thermal Pad
Upon completion of installation, you can first conduct a visual inspection to check for any cracks, bubbles, creases, or displacement. Should any such issues be present, the thermal pad will be unable to perform correctly and must be reapplied. Should no issues be apparent upon visual inspection, you may additionally employ thermal imaging equipment or conduct operational tests to assess whether the heat dissipation performance meets your needs by temperature variations or power consumption.
Step 6:Reinstall the Thermal Pad
When reapplying, if your thermal pad lacks an adhesive layer and remains undamaged and free from deformation after removal, it may be reused. However, if your thermal pad has an adhesive layer, a brand new one must be used. Surfaces should also be thoroughly cleaned before reinstallation. Once installed, thermal pads can maintain a service life of approximately 2 to 10 years without requiring the frequent maintenance associated with thermal paste. Installation of thermal pads is easy, and automated equipment can be utilized to achieve efficient, high-volume processing.
Common Errors to Avoid When Sticking a Thermal Pad
Incorrect Thermal Pad Selection
Whether considering thermal conductivity, thickness, or operating conditions, thermal pads must satisfy your requirements. Otherwise, they will compromise heat dissipation performance. Pads with insufficient thermal conductivity(typically <1 W/m·K) fail to achieve satisfactory heat dissipation, resulting in a reduced service life. Excessively thin pads cannot achieve maximum thermal contact area, while overly thick pads create longer heat transfer paths, resulting in inefficient performance. So, choosing the correct thermal pad is important before application.
Surface Uncleaned
If the surfaces and operating environment where the thermal pad is to be installed are not thoroughly cleaned, dust, stains, and residual old thermal pads may become bonded together. These contaminants not only cause low thermal conductivity and high thermal resistance, resulting in poor heat dissipation efficiency, but also readily create voids during thermal pad installation, leading to trapped air. Therefore, prior to any installation, cleaning process is critical.
Folding Thermal Pads
Firstly, you must not fold thermal pads before application. Should the dimensions prove excessive, trimming is permissible. If the thermal pad is too thin, it is advisable to replace it with one of better thermal conductivity. Secondly, thermal pads are exceptionally thin and pliable, rendering them highly susceptible to damage through folding. Moreover, if your thermal pad incorporates an adhesive layer, folding will compromise its integrity, resulting in material wastage.
Reusing Failed Thermal Pads
Even thermal pads without adhesive layers will exhibit wear and accumulate dust after use. Furthermore, thermal pads possess a shelf life and operational lifespan; prolonged usage may lead to diminished performance. During installation, should an adhesive-free thermal pad become misaligned or otherwise displaced without compromising its thermal conductivity, it may be safely removed and reinstalled. However, for thermal pads featuring adhesive layers or those that have been in service for an extended period, you’d better replace them with new ones.
Which Applications Can I Apply Thermal Pads to?
Electronic Products
Thermal pads can be used on components such as CPUs, GPUs, and VRMs within computers and host equipment to achieve efficient heat dissipation, preventing heat accumulation within the device that could impair performance or cause damage. Moreover, owing to their lightweight nature and high efficiency, thermal pads can also be utilized in portable devices, including mobile phones, smartwatches, tablets, and laptops, to enhance the reliability of your product.
LED Lighting
If you are seeking suitable thermal management materials for high-power LED lighting, thermal pads are the preferred choice. They assist in cooling your LED lighting products, mitigating brightness reduction or uneven illumination caused by overheating. Furthermore, they enable LED lighting to operate continuously around the clock without failure, thereby extending the service life of your products.
Automotive Systems
You can also stick thermal pads in control systems, battery modules and other components within automotive applications. They facilitate continuous heat dissipation, enabling these components to maintain normal operating temperatures during sustained operation. Options are available for thermal pads offering enhanced mechanical strength and elasticity. This permits the pads to provide cushioning for components, ensuring the vehicle remains stable and quiet when subjected to vibration and impact.
Industrial Equipment
Sticking thermal pads to industrial machinery, smart devices, and robotic systems enhances the stability and reliability of your products. On the one hand, they prevent performance degradation or processing errors in equipment and manufactured goods caused by heat, enabling sustained production and minimizing downtime. On the other hand, timely heat dissipation and thermal management further optimize the energy efficiency of equipment, thereby reducing operational costs.
Medical Equipment
Thermal pads are highly suitable for application in medical imaging equipment, monitoring and measurement devices, and similar apparatus. Not only do they offer a neat, maintenance-friendly solution, but they are also exceptionally well-suited for temperature-sensitive applications. They provide stable, reliable temperature control, enhancing the accuracy of your equipment and extending the lifespan of your costly apparatus. You may also opt for thermal pads with electromagnetic shielding capabilities, such as carbon fibre thermal pads, to prevent interference caused by numerous devices, thereby further enhancing safety.
FAQs
Is a Thermal Pad Necessary?
Thermal pads can enhance heat dissipation efficiency for your electronic devices, automobiles, electrical appliances and other products, thereby improving performance and extending service life.
Are Thermal Pads Adhesive?
Thermal pads without an adhesive layer are non-adhesive. They possess excellent conformability to mould to surfaces. You can select or customize thermal pads with an adhesive layer for a more secure installation.
What Should be Done If the Thermal Pad is too Thin?
If your thermal pad is excessively thin, you should procure one of a more suitable thickness. Under no circumstances should you stack them for use, as this will result in inefficient heat dissipation. Therefore, it is advisable to engage in thorough communication with your supplier to confirm the appropriate thickness, thereby preventing additional costs and delays caused by an unsuitable thickness.
How Thermal Pads Work？
On the one hand, thermal pads enable uneven components and heat sink surfaces to achieve a flatter, more uniform contact, thereby increasing the thermal contact area. On the other hand, thermal pads possess excellent thermal conductivity, effectively replacing the low-conductivity air present in gaps. This allows them to rapidly transfer heat generated by the heating element to the heat sink for timely dissipation.
What is the Difference between Thermal Pads and Thermal Tapes?
All thermal tapes feature an adhesive layer, whereas thermal pads can be selected without one. Furthermore, thermal pads offer a greater variety in types and exhibit higher thermal conductivity than thermal tapes, thereby catering to a wider range of applications and higher heat dissipation demands.
What is the Lifespan of a Thermal Pad?
This depends on the type of thermal pad selected and its usage conditions. A standard-compliant thermal pad typically lasts between two and ten years. Incorrect installation and usage may result in a shorter lifespan.
Final Thoughts
Once you are familiar with the application steps and techniques for thermal pads, you will be able to utilize them more effectively. Should you have further queries or require new thermal pads, GALLOP INNOTEK not only supplies high-quality and customized thermal pads but also offers personalized guidance. Please do not hesitate to contact us if needed.
