A Graphite Sheets, often referred to as a thermally conductive graphite sheets or pyrolytic graphite sheets, is an advanced material engineered for superior thermal management. It is a thin, flexible, and lightweight film composed of highly ordered graphite layers. This unique structure allows it to conduct heat exceptionally well in the X-Y plane (laterally) while providing excellent electrical insulation. As electronic devices become smaller, faster, and more powerful, managing the heat they generate is a critical challenge. Graphite sheets are the preferred solution in countless applications, from smartphones and laptops to LED lighting and automotive battery systems, effectively drawing heat away from sensitive components and dispersing it over a larger area or towards a heat sink.
Selecting the right graphite sheets requires understanding its key parameters. Kaxite offers a range of high-performance sheets tailored to specific needs. Below are the detailed specifications for our standard product line.
| Parameter | Standard Grade | High-Performance Grade | Ultra-High Conductivity Grade | Units / Notes |
|---|---|---|---|---|
| In-Plane Thermal Conductivity | 300 - 600 | 800 - 1200 | 1500 - 1950 | W/m·K |
| Thickness | 0.025, 0.05, 0.1 | 0.025, 0.05, 0.1, 0.2 | 0.025, 0.05, 0.1 | mm (Standard options) |
| Density | 1.0 - 1.3 | 1.5 - 1.9 | 2.0 - 2.3 | g/cm³ |
| Operating Temperature | -40 to 150 | -40 to 200 | -40 to 400 (Inert Gas) | °C |
| Tensile Strength | > 8 | > 10 | > 12 | MPa |
| Electrical Resistance | > 10⁵ | > 10⁵ | > 10⁵ | Ω·cm (Surface) |
| EMI Shielding Effectiveness | 60 - 80 | 80 - 100 | 100+ | dB @ 1 GHz |
| Standard Color | Black | Black | Black / Silver | - |
| Typical Applications | Consumer electronics, LED lighting | Smartphones, tablets, gaming devices | 5G modules, servers, high-power batteries | - |
Q: How does a graphite sheet work for thermal management?
A: A graphite sheet works by leveraging the highly ordered crystalline structure of graphite. Heat absorbed at a "hot spot" (like a processor) is rapidly spread across the entire X-Y plane of the sheet due to its high in-plane thermal conductivity. This action effectively lowers the temperature at the hotspot by distributing the thermal energy over a much larger surface area, from where it can be more easily transferred to a heat sink, chassis, or the ambient air.
Q: Is a graphite sheet electrically conductive?
A: Pure graphite sheets are electrically conductive in the plane. However, for most electronics applications, they are used with single or double-sided adhesive tapes that are electrically insulating (e.g., acrylic or silicone-based). Kaxite can supply graphite sheets with pre-applied insulating die-cut tapes to ensure safe electrical isolation while maintaining optimal thermal performance.
Q: Can I cut and shape a graphite sheet myself?
A: Yes, graphite sheets are highly flexible and can be easily die-cut, laser-cut, or even hand-cut with sharp scissors or a blade for prototyping. It is important to handle them carefully to avoid tearing, especially with thinner grades. For volume production, precision die-cutting is recommended to ensure consistency and avoid contamination.
Q: How do I choose the right thickness and grade?
A: The choice depends on your thermal budget, space constraints, and heat source power. Thinner sheets (e.g., 0.025mm) are for extremely space-limited, moderate-heat applications. Thicker sheets (e.g., 0.1mm-0.2mm) offer higher thermal capacity for more powerful hotspots. The grade (thermal conductivity) should be matched to the heat flux density; high-power applications like server CPUs require our Ultra-High Conductivity Grade.
Q: How does Kaxite's graphite sheet compare to traditional metal shims?
A: Kaxite graphite sheets outperform metal shims like copper or aluminum in several key ways. They are significantly lighter (about 25% the density of aluminum) and thinner for the same thermal spreading performance. They are more flexible, allowing for better contact on uneven surfaces. Crucially, they provide in-plane conductivity up to 5 times higher than copper, making them far more efficient at lateral heat spreading, which is the primary function in most electronics.
Q: What is the shelf life and how should I store graphite sheets?
A: Kaxite graphite sheets have a long shelf life when stored properly. They should be kept in their original packaging in a cool, dry environment away from direct sunlight and extreme humidity. Avoid placing heavy objects on top of the sheets to prevent compression and potential damage. Under recommended conditions, the material properties remain stable for years.
Q: Can graphite sheets be used for EMI shielding as well?
A: Absolutely. Graphite sheets are excellent EMI shielding materials. Their conductive carbon network absorbs and reflects electromagnetic waves. Many of our products, especially the higher density grades, offer shielding effectiveness exceeding 80 dB, providing dual functionality of thermal management and EMI/RFI protection in a single, lightweight layer.
Q: Does Kaxite offer custom solutions?
A: Yes, Kaxite specializes in providing customized thermal management solutions. We can engineer graphite sheets with specific thicknesses, densities, and thermal properties. We also offer pre-cutting, slitting, and laminating services with various adhesives, insulating films, or other materials (like copper foil) to create a tailored component that fits your exact mechanical and thermal requirements.
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