Why Choose Our Graphite Foil？
- 10+ years of TIM + EMI material manufacturing experience
- Support from design to mass production
- In-house testing laboratories and over 30 quality inspection procedures
- Compliant with RoHS / UL94 V0
- Thickness, dimensions, adhesive layer and cutting can all be customised
Your Reliable Graphite Foil Supplier
GALLOP INNOTEK offer high-performance graphite foil specifically engineered for efficient thermal management in compact, high-power electronic systems. With exceptional in-plane thermal conductivity, flexible form factors, and stable long-term performance, our graphite foil is widely utilised in thermal interface material solutions to effectively eliminate hotspots and enhance overall thermal efficiency. We support custom thicknesses, dimensions, and lamination options to meet application requirements across consumer electronics, automotive, energy, and industrial sectors. GALLOP INNOTEK also maintains comprehensive quality management and stable supply capabilities, positioning us as your trusted supplier.
Features of Graphite Foil
In-plane thermal conductivity is 480–1350 W/m·K, Through-plane thermal conductivity approximately 5.0 W/m·K
Ultra-thin thickness combined with high graphite purity results in very low thermal resistance.
Possesses a degree of electrical conductivity to achieve electromagnetic shielding.
Optimal operating temperature range approximately -40 to 400°C, with stable performance at high temperatures.
Long service life with no ageing, eliminating the need for frequent replacement, suitable for encapsulation.
Flexible and bendable, allowing precise and effortless cutting to suit the product.
Low repulsion and good conformability with surfaces when lamination
Suitable for silicone-sensitive products, does not emit or migrate silicone oil or vapour.
Thermal Diffusion Capability
Graphite foil does not directly cool components. Its thermal conductivity in the thickness direction is approximately 5.0 W/m·K, which is relatively low. However, its thermal diffusion capability across the surface can reach 1350 W/m·K. This enables efficient localised temperature reduction while rapidly and uniformly distributing heat, thereby enhancing the heat dissipation efficiency of thermal interface materials. Particularly for high-power and high-performance products, it prevents performance fluctuations and improves stability during high-power operation.
Lightweight Design
Graphite foil delivers satisfactory performance at exceptionally thin thicknesses and remarkably light weights, making it highly conducive to lightweight and flexible designs. We also offer ultra-thin graphite foil to meet the most stringent space and weight requirements. Moreover, it has a degree of flexibility and exhibits fatigue resistance even when bent over curved surfaces. Moreover, it is readily machinable, allowing you to cut it precisely to your product specifications.
Long-term Stable Choice
Compared to polymer-based thermal interface materials such as silicone, graphite foil is not only suitable for silicone-free applications but also has no volatilisation, drying out, and pumping out during prolonged operation. It withstands more frequent thermal cycling and offers superior fatigue resistance, with performance remaining largely unchanged over time. GALLOP INNOTEK maintains rigorous quality control procedures, with all graphite foils undergoing over 30 quality inspections. It is a dependable long-term solution for demanding electronic applications.
Applications of Graphite Foil
Graphite foil enhances heat dissipation efficiency in mobile phones, computers, cameras and wearable devices without compromising device space or weight.
Graphite foil used in power batteries and energy storage systems, as well as lithium batteries, prevents overheating, enhances safety, and reduces energy loss.
Maintain optimal operating temperatures for high-power LEDs and high-refresh-rate displays to achieve stable brightness and image quality, thereby extending service life.
5G modules, routers and similar devices all require efficient heat dissipation via graphite foil to prevent overheating failures and enhance signal stability.
You may utilise long-life, high-reliability graphite foil in the vehicle’s battery management system (BMS), on-board control unit, and sensors.
Industrial power modules, electrical systems, and control units require graphite foil to maintain continuous operational reliability and reduce the risk of downtime failures.
Graphite foil has a degree of electrical conductivity, enabling it to form a more continuous current-carrying layer that reflects electromagnetic interference. It can provide some resistance to electromagnetic interference while conducting heat. However, its electromagnetic shielding capability is inferior to that of copper foil.
Graphite foil has exceptionally high thermal diffusion capabilities within its plane, whereas copper foil demonstrates merely average performance. Graphite foil is typically thinner and lighter in weight than copper foil, making it more suitable for lightweight design applications. Furthermore, graphite foil offers superior flexibility.
Yes. Thermal interface materials efficiently conduct heat in the thickness direction. Graphite foil enhances efficiency by facilitating heat diffusion within the surface plane. When used in combination, they achieve highly effective heat dissipation.
This requires selection based on your application’s thermal density, available space, and system design. Increased thickness does not enhance thermal conductivity; thinner profiles can reduce thermal resistance, though adhesion must also be considered. We offer bespoke selection services, allowing you to choose after knowing our recommendations.
Graphite foil can indeed aid heat dissipation by spreading thermal energy, thereby reducing the need for heat sinks in projects with low thermal demands and allowing for the use of smaller heat sinks. However, heat sinks remain more efficient at releasing heat and cannot be entirely replaced by graphite foil.
No. Graphite foil is extremely thin. Although it has high thermal conductivity and minimal thermal resistance, it cannot effectively fill the gaps between components and heat sinks. Thermal interface materials achieve heat dissipation by minimising thermal resistance.
What is the Graphite Foil？
Graphite foil is typically manufactured from natural or synthetic graphite. Benefiting from its unique graphene crystal structure, unlike conventional thermal interface materials that conduct heat along the Z-axis, it efficiently dissipates heat across the X-Y plane, thereby reducing localised hotspots. This effectively prevents thermal concentration from degrading performance in your products. Also, as an advanced thermal diffusion material, it has exceptional heat dissipation capabilities while remaining very thin and lightweight. Consequently, it is an ideal choice for compact and densely packed devices.
Types of Graphite Foil
Natural Graphite Foil
Natural graphite foil is produced directly from natural graphite through a calendering process. Its thermal conductivity typically ranges from 300 to 700 W/m·K, which is lower than that of artificial graphite foil. However, its raw material is more readily available, and its processing costs are lower, making it a cost-effective choice. It can be used in electronic products, battery components, and LED heat dissipation systems.
Synthetic Graphite Foil
Synthetic graphite foil is manufactured from higher-purity graphite obtained through high-temperature pyrolysis. This makes it with superior thermal conductivity compared to natural graphite foil (reaching up to 1350 W/m·K). Furthermore, owing to fewer impurities, it has less performance variation alongside enhanced flexibility and compressibility. Whilst natural graphite foil has a higher price, it remains highly cost-effective for applications demanding extreme thermal conductivity. You can use them in high-end electronic devices, precision thermal management systems, and high-reliability industrial equipment.
Ultra-thin Graphite Foil
Graphite foil is inherently lightweight, yet ultra-thin variants are also available. With thicknesses below 0.025 mm, these are very suitable for use in applications with stringent weight and space constraints, such as wearable devices. Furthermore, ultra-thin graphite foil offers lower thermal resistance, maximising heat transfer efficiency within devices featuring flat surfaces. However, you had better use them in applications where the surface is flat and where mechanical strength is not a primary requirement.
Composite Graphite Foil
Graphite foil can be laminated with thermal interface materials, adhesive backing, insulating films and other substrates to produce multifunctional composite graphite foils. Laminating graphite foil with adhesive backing facilitates easier assembly and provides enhanced stability in equipment susceptible to vibration and impact. Laminating with thermal interface materials fills gaps, maximises thermal contact area and improves heat diffusion efficiency. Laminating with insulating films enables safer application in battery systems and high-voltage power supplies, reducing the risk of short circuits.
How Does Graphite Foil Dissipate Heat?
Thermal Contact
Owing to graphite foil’s considerable hardness and low compressibility, it is hard to achieve full conformity with rough surfaces. This results in elevated porosity, thereby increasing thermal resistance. Consequently, graphite foil should be used in combination with other thermal interface materials. Thermal pads and thermal gels can effectively fill gaps, maximising the thermal contact area and thus optimising the graphite foil’s thermal diffusion performance.
Thermal Diffusion and Heat Transfer
During operation, components generate heat. Graphite foil rapidly disperses this heat from localised points across the entire surface, preventing thermal concentration and swiftly reducing temperatures. The exceptional thermal interface material’s Z-axis heat transfer capability then efficiently conveys this diffused surface heat to the casing or heat sink. Furthermore, graphite foil achieves more uniform heat dissipation, thereby extending component lifespan.
