In the realm of advanced thermal management materials, graphite sheet technology stands out for its exceptional performance. As a highly efficient thermal interface material (TIM), it is engineered to manage heat dissipation in increasingly compact and powerful electronic devices. At Kaxite, we specialize in manufacturing high-purity, high-performance graphite sheets that meet the rigorous demands of modern industries. Our products are not merely components; they are critical solutions for enhancing device reliability, prolonging lifespan, and ensuring optimal operational performance.
Kaxite Graphite Sheets are distinguished by a unique set of properties derived from their crystalline structure.
Understanding the specifications is crucial for selecting the right graphite sheet for your application. Below are the detailed parameters for Kaxite's standard product line.
| Property | Typical Value | Test Method / Notes |
|---|---|---|
| In-Plane Thermal Conductivity | 300 - 1950 W/m·K | ASTM E1461, Laser Flash |
| Through-Plane Thermal Conductivity | 5 - 20 W/m·K | ASTM D5470 |
| Density | 1.0 - 2.2 g/cm³ | ASTM D792 |
| Thickness Range | 0.01mm - 3.0mm | Tolerance: ±10% |
| Operating Temperature | -40°C to +400°C (in inert gas) | Long-term air exposure limit: ~450°C |
| Tensile Strength | 5 - 20 MPa | ASTM D882 |
| Electrical Resistivity | 1.0 x 10⁻⁵ - 5.0 x 10⁻⁵ Ω·m | In-plane direction |
| Shielding Effectiveness | Up to 120 dB (for EMI grades) | 1 GHz frequency |
| Series Code | Primary Feature | Thermal Conductivity (W/m·K) | Typical Thickness (mm) | Key Application |
|---|---|---|---|---|
| KX-GS100 | Standard Performance | 300 - 600 | 0.025, 0.05, 0.1, 0.2 | Consumer Electronics, LED Lighting |
| KX-GS500 | High Performance | 800 - 1200 | 0.025, 0.05, 0.1 | Smartphones, Tablets, Laptops |
| KX-GS1000 | Ultra-High Performance | 1500 - 1950 | 0.017, 0.025, 0.05 | 5G Devices, Servers, High-Power ICs |
| KX-GS-EMI | EMI Shielding Integrated | 500 - 900 | 0.05, 0.1, 0.2 | RF Modules, Automotive Electronics |
| KX-GS-TS | Thermally Conductive & Insulating | 15 - 25 (through-plane) | 0.5, 1.0, 2.0 | Power Modules, Battery Packs |
Kaxite graphite sheets are versatile and serve critical functions across multiple high-tech sectors.
Q: What exactly is a graphite sheet and how does it work for thermal management?
A: A graphite sheet is a thin, flexible material made from compressed exfoliated graphite or highly oriented pyrolytic graphite. It works by leveraging the highly ordered crystal structure of graphite. Heat is conducted rapidly along the plane of the sheet (in-plane direction) due to strong covalent bonds between carbon atoms within each layer. This allows it to act as a "heat spreader," quickly distributing localized hot spots over a larger surface area, from where heat can then be more efficiently transferred to a heat sink or the device casing.
Q: How does a graphite sheet compare to traditional metal heat spreaders like copper or aluminum?
A: Graphite sheets offer several advantages. They are significantly lighter (lower density) and can be much thinner while providing comparable or superior in-plane thermal conductivity. They are more flexible, allowing for better conformity to surfaces. Unlike metals, graphite sheets are not prone to galvanic corrosion. However, their through-plane conductivity is lower than metals, which is why they are primarily used as spreading layers rather than for through-thickness conduction.
Q: Can Kaxite graphite sheets be easily cut and shaped for my specific application?
A: Yes, absolutely. One of the key benefits of Kaxite graphite sheets is their excellent machinability. They can be easily die-cut, laser-cut, stamped, or even hand-cut with scissors or a blade into virtually any two-dimensional shape. This allows for precise customization to fit unique component layouts, screw holes, and connectors without compromising the material's integrity or thermal performance.
Q: Are graphite sheets electrically conductive? Is electrical isolation needed?
A: Yes, graphite sheets are electrically conductive in the in-plane direction. This property is leveraged in EMI shielding grades. Therefore, if the sheet will be in direct contact with live electrical components or traces, an electrically insulating layer (such as a polyimide film or a thermally conductive but electrically insulating adhesive) must be applied to one or both sides to prevent short circuits. Kaxite offers pre-laminated versions with such insulating layers for convenience and safety.
Q: What are the key factors to consider when selecting a graphite sheet grade?
A: The main selection criteria include: 1) Required in-plane thermal conductivity (higher for more demanding hotspots), 2) Available space and thickness constraint, 3) Need for additional functions like EMI shielding, 4) Operating temperature range and environmental conditions, 5) The surface finish and whether adhesive or insulation layers are required. Our Kaxite technical team can guide you based on your specific thermal simulation data and design parameters.
Q: How should graphite sheets be handled and installed?
A: Handle with clean hands or gloves to avoid contamination. The sheets are flexible but can be brittle if bent over a very small radius; avoid sharp folds. During installation, ensure the mating surfaces are clean and flat. Use a gentle, even pressure to apply. If using an adhesive-backed version, align carefully before making contact as repositing may be difficult. For non-adhesive sheets, a light thermal grease or phase change material can be used to improve interface contact.
Q: What is the long-term reliability of Kaxite graphite sheets?
A: Kaxite graphite sheets are designed for high reliability. They do not dry out, pump out, or degrade like some traditional thermal greases or pads. They are chemically inert and stable across their specified temperature range. Under continuous operation in air below 400°C, oxidation is minimal, ensuring consistent thermal performance over the typical lifespan of the electronic device. We subject our products to rigorous aging and thermal cycling tests to guarantee long-term stability.
Q: Can Kaxite provide custom graphite sheet solutions?
A: Yes, Kaxite specializes in providing tailored thermal management solutions. Beyond our standard series, we offer customization in thickness, density, thermal conductivity, sheet dimensions, and lamination with various films, foils, or adhesives (like PSA - Pressure Sensitive Adhesive). We work closely with clients from the prototyping phase through to volume production to develop the optimal graphite sheet configuration for their unique thermal challenges.
