English
In the demanding world of modern electronics, power systems, and industrial machinery, effective heat dissipation is not just an advantage—it's a necessity. That's where advanced thermal interface materials (TIMs) come into play, and among them, Graphite Sheet stands out as a superior choice. Engineered for exceptional thermal conductivity, flexibility, and reliability, graphite sheets are critical components in extending product life and ensuring operational stability. At Kaxite Seals, we specialize in manufacturing premium-grade graphite sheets that meet the rigorous demands of global industries. Our commitment to innovation and quality ensures that our materials provide optimal performance in the most challenging environments.
A graphite sheet is a thin, flexible material manufactured from high-purity natural or synthetic graphite. Through an exfoliation and compression process, the graphite crystals are aligned in a planar orientation, creating a sheet with highly anisotropic properties. This means it conducts heat exceptionally well in the plane of the sheet (in-plane direction) while providing good electrical insulation. This unique combination makes it an ideal thermal management solution for applications where space is limited, weight is a concern, and efficient heat spreading is paramount.
Understanding the technical specifications is crucial for selecting the right graphite sheet for your application. Below are the detailed parameters that define our product range.
| Parameter | Standard Grade | High-Performance Grade | Enhanced Grade | Test Method / Notes |
|---|---|---|---|---|
| Thickness (mm) | 0.1, 0.125, 0.15, 0.2 | 0.05, 0.1, 0.15, 0.2 | 0.1, 0.15, 0.2, 0.25, 0.3 | Custom thicknesses available |
| In-Plane Thermal Conductivity (W/m·K) | 300 - 400 | 600 - 800 | 400 - 500 | ASTM E1461 |
| Through-Plane Thermal Conductivity (W/m·K) | 5 - 10 | 8 - 15 | 6 - 12 | ASTM E1461 |
| Density (g/cm³) | 1.0 - 1.2 | 1.1 - 1.3 | 1.05 - 1.25 | ASTM D792 |
| Tensile Strength (MPa) | ≥ 4.0 | ≥ 6.0 | ≥ 5.0 | ASTM D828 |
| Compressibility (%) | 10 - 25 | 7 - 15 | 15 - 30 | At 1000 psi |
| Electrical Resistivity (Ω·cm) | ≥ 1.0 x 10-3 | ≥ 1.0 x 10-3 | ≥ 1.0 x 10-3 | In-plane direction |
| Dielectric Strength (kV/mm) | > 5 | > 5 | > 5 | ASTM D149 |
| Typical Applications | LED lighting, consumer electronics, general heat spreading | 5G devices, servers, high-power CPUs/GPUs | Battery packs, power modules, automotive electronics | Selection depends on full system requirements |
Choosing our graphite sheet material offers a multitude of benefits for engineers and designers:
Q: How does a graphite sheet work to dissipate heat?
A: A graphite sheet works primarily through in-plane thermal conduction. When placed on a heat-generating component (like a CPU), it absorbs heat at the point of contact. Due to its high in-plane thermal conductivity, this heat is rapidly spread across the entire surface area of the sheet. This effectively turns a concentrated "hot spot" into a larger, cooler area. The heat is then more efficiently transferred to a heat sink, chassis, or the surrounding air over this larger area, significantly improving overall heat dissipation compared to materials that only conduct heat vertically.
Q: What is the main difference between graphite sheets and traditional thermal pads or greases?
A: The primary difference lies in the direction and mechanism of heat transfer. Traditional thermal pads and greases are designed to conduct heat in the through-plane direction (vertically from the component to the heat sink). Their thermal conductivity typically ranges from 1 to 12 W/mK. Graphite sheets, especially those from Kaxite Seals, excel at in-plane conduction (300-800+ W/mK), acting as a heat spreader. They are often used in conjunction with or as a replacement for pads/greases in applications requiring lateral heat spreading. Additionally, graphite sheets do not suffer from pump-out, dry-out, or curing issues, offering more reliable long-term performance.
Q: Are Kaxite Seals graphite sheets electrically conductive?
A: This is a common point of clarification. Our standard graphite sheets exhibit high electrical resistivity in the through-plane direction (perpendicular to the sheet), making them electrically insulating for most practical purposes in electronics. This allows them to be placed directly on circuits without causing short circuits. However, conductivity in the in-plane direction is higher. For applications requiring absolute electrical isolation, we offer laminated versions with insulating polymer films on one or both sides.
Q: Can graphite sheets be used as a gasket material?
A: Yes, absolutely. The inherent properties of expanded graphite make it an excellent sealing material for high-temperature and corrosive service. Kaxite Seals graphite sheets are compressible, resilient, and can be used to create custom gaskets for flanges, exhaust systems, and chemical processing equipment. They seal effectively against gases and liquids and maintain their integrity under extreme temperatures where elastomeric gaskets would fail.
Q: How do I handle and install a graphite sheet?
A: Graphite sheets are generally robust but require careful handling to avoid tearing, especially the thinner grades. Use clean tools or gloves to prevent contamination. The sheet can be cut with sharp blades or dies. For thermal interface applications, it is often placed between the component and the heat sink. Depending on the design, it may be used with a light adhesive, a frame, or simply held in place by the assembly pressure. Ensure the surfaces are clean and flat for optimal thermal contact. For gasketing, follow standard torque procedures for the specific flange.
Q: What industries and applications are best suited for your graphite sheets?
A: Kaxite Seals graphite sheets serve a vast array of industries. Key sectors include:
Q: Can you provide custom-shaped graphite sheets?
A: Yes, customization is a core strength of Kaxite Seals. We offer precision die-cutting services to produce graphite sheets in any shape or size required for your specific assembly. We can also provide laminations with pressure-sensitive adhesives (PSA), insulating films, or foil for easy integration. Our engineering team can work with you to develop the optimal thermal or sealing solution based on your mechanical and thermal requirements.
Q: What are the long-term performance and lifespan expectations?
A: Kaxite Seals graphite sheets are designed for long-term reliability. As a solid-state material, they do not degrade over time through processes like evaporation or chemical change. They maintain their thermal and mechanical properties through thousands of thermal cycles. Their performance is stable as long as they are used within their specified temperature and environmental limits (particularly protected from strong oxidizing atmospheres at very high temperatures). In properly designed assemblies, they can last the entire operational lifetime of the product.
