Thermal Graphite Materials
Graphite provides excellent XY-plane heat spreading to rapidly disperse localized hotspots. Select the material according to thermal performance, thickness, temperature resistance, processability, structural support and EMI requirements.
Thermal Graphite Selection Guide
Thermal graphite primarily spreads heat across a plane. Selection must account for hotspot location, heat-transfer direction, material structure, thickness, handling strength, temperature resistance, electrical insulation and EMI requirements.
Define the Heat Path
Graphite spreads concentrated heat outward along the XY plane to reduce localized hotspots. Transferring heat across a gap along the Z axis to a heat sink generally still requires a thermal pad or liquid interface material.
- Hotspot size and location
- Intended spreading direction
- Available heat-spreading area
- Final heat-dissipation path
- Need to accommodate height differences
In-plane heat spreading alone cannot solve every thermal problem. Without a housing, heat sink or metal frame that can release the heat, the graphite sheet will only distribute the hotspot more evenly.
Evaluate Performance and Thickness
Graphite heat spreading depends on more than thermal conductivity. Material thickness, coverage area and hotspot location also affect performance. Higher XY-plane conductivity spreads heat rapidly, while suitable thickness increases overall heat-spreading capacity.
- XY-plane thermal conductivity
- Material thickness
- Heat-source power
- Hotspot and coverage area
- Target temperature and surface-temperature variation
Do not compare thermal conductivity alone. Even an ultra-thin material with high conductivity may be limited by its thickness, area, adhesive layer and contact thermal resistance.
Check Space and Lamination
Confirm the available thickness, bonding area and surface geometry. Include adhesive, PET protective layers, copper foil and other laminated layers in the total thickness to prevent mechanical interference.
- Available installation thickness
- Bonding area and location
- Flat or curved structure
- Bend location and radius
- Adhesive and laminate thickness
Graphite sheets can conform to gentle curves but should not be folded at sharp angles or repeatedly bent at the same point. Doing so may cause cracking, delamination or reduced thermal performance.
Check Temperature and Environment
The graphite base material varies in temperature resistance, while adhesive, PET, copper foil and other laminated layers may limit the finished product’s operating temperature. Confirm the operating range and environmental reliability of the complete structure.
- Long-term and short-term temperatures
- Thermal-cycling conditions
- Humidity and chemical environment
- Temperature resistance of adhesive and protective layers
- Service-life and reliability requirements
Do not use the graphite base material’s temperature range as the finished-product rating. Adhesive, PET and other laminated materials often determine the actual operating-temperature limit.
Assess Insulation and EMI Shielding
Graphite is electrically conductive. When placed near a PCB, exposed terminal or metal contact, maintain a safe clearance or add PET, insulating film and edge protection. If EMI shielding is also required, evaluate a graphite-copper composite and grounding design.
- Exposed terminals and safety clearance
- Surface and edge insulation
- PET or insulating-film configuration
- EMI shielding requirements
- Copper-foil continuity and grounding location
EMI shielding is different from wave absorption. A graphite-copper composite primarily uses the copper foil to block or reflect electromagnetic interference. Appropriate electrical continuity and grounding are still required when it serves as a shielding layer.
Choose the Right Thermal Graphite Sheet
This composite combines highly conductive graphite with copper foil. The graphite rapidly spreads heat across the plane, while the copper foil provides structural support and EMI shielding. Compared with a single graphite layer, it is flatter and easier to die-cut and assemble, making it suitable for slim electronics and high-reliability mass production.
Efficient Heat Spreading
Rapidly disperses concentrated hotspots.
Structural Support
Copper foil improves flatness and rigidity.
EMI Shielding
Reduces high-frequency electromagnetic interference.
Processing Stability
Suits die-cutting, placement and mass production.
Laminated Design
Supports PET, adhesive and release liners.
Notebook computers
Smartphones
Projectors
Set-top box
5G base stations
New-energy vehicle electronics
Made from natural graphite, this material offers low density, good flexibility, a broad temperature range and multiple thickness options. It spreads concentrated heat across the XY plane and suits large-area heat spreading, gentle curves and cost-conscious electronic applications.
Broad Temperature Range
Suits high- and low-temperature operation.
Multiple Thicknesses
Fits different mechanical spaces.
Low Density
Reduces equipment and cooling-system weight.
Flexible Conformity
Applies to flat and gently curved surfaces.
Cost Balance
Suitable for large-area heat spreading.
5G base stations
New-energy vehicle electronics
LED lighting modules
Tablets
industrial control equipment
High-temperature electronics
An artificial graphitization process forms an ultra-thin, high-purity graphite film with flexibility, low weight and extremely high XY-plane thermal conductivity. It rapidly spreads hotspots from high-power chips and is particularly suitable for mobile and wearable devices with limited space and high heat flux.
Ultra-High Conductivity
Rapidly spreads high-power chip hotspots.
Ultra-Thin
Suits confined and slim structures.
Flexible and Lightweight
Suits confined and slim structures.
Uniform Material
Provides stable in-plane thermal performance.
Custom processing
Supports PET, adhesive and die-cutting.
Tablets
Smartphones
Wearable devices
ultra-thin laptops
5G communications modules
High-brightness LED modules
Thermal Graphite Sheet Installation
Clean the surfaces
Remove dust and oil, and keep the surface dry and flat.
Confirm the Position
Align the sheet with the hotspot and spreading direction while avoiding exposed terminals.
*For EMI shielding, confirm the grounding and electrical continuity of the graphite-copper composite.
Remove the Liner
Peel slowly from one side without touching or pulling the adhesive surface.
Align and Apply
Apply gradually from one side to prevent wrinkles, misalignment and air bubbles.
*Use a fixture for synthetic graphite to prevent stretching and sharp bends.
Press and Inspect
Use a soft roller and inspect the edges and insulation protection.
*Check natural graphite for edge damage, flaking and contact with terminals.
Note:Graphite is electrically conductive. Keep it away from exposed terminals and avoid sharp folds, repeated bending and excessive stretching. Add PET, insulating film or edge protection where required.
Feature Overview
Ultra-Thin
Efficient Heat Spreading in Limited Space
Available down to 35 μm, it spreads hotspots without significantly increasing assembly thickness. It suits smartphones, wearables and ultra-thin electronics.
Rapid Heat Spreading
Spread Localized Heat Across a Larger Area
Excellent XY-plane thermal conductivity spreads concentrated heat outward, reducing peak temperatures near the chip and temperature differences across the device surface.
Lightweight
Reduce Cooling-System Weight
Graphite combines high thermal conductivity with low weight, reducing the need for heavy metal heat-spreading structures. It suits mobile devices, drones and automotive electronics.
Flexible Conformity
Fits Flat, Curved and Confined Structures
The flexible sheet conforms to flat and gently curved surfaces, providing greater freedom in heat-spreading path design for compact and irregular structures.
Reliability
Maintain Heat Spreading at High Temperatures
Natural graphite offers a broad temperature range for communications, industrial and high-temperature electronics. The actual limit must still be confirmed from the adhesive and laminate specifications.
EMI Shielding
Manage Hotspots and High-Frequency EMI
A graphite-copper composite combines highly conductive graphite with copper foil to provide in-plane heat spreading and electromagnetic shielding for high-frequency, highly integrated electronics.
Thermal Graphite Sheet Selection FAQs
Does a graphite sheet transfer heat to a heat sink or spread it outward?
A graphite sheet primarily spreads heat rapidly across the XY plane to reduce localized hotspots. Transferring heat across a gap along the Z axis to a heat sink generally requires a thermal pad or liquid interface material.
What is the main difference between natural and synthetic graphite?
Synthetic graphite is thinner and offers higher XY-plane thermal conductivity, making it suitable for slim devices with high power density. Natural graphite offers more thickness options, a broader temperature range and better suitability for large areas.
When should a graphite-copper composite be used?
Choose a graphite-copper composite when the device requires structural support, dimensional stability, EMI shielding or easier die-cutting and assembly in addition to heat spreading.
Does higher thermal conductivity always improve actual cooling?
Not necessarily. Actual performance also depends on thickness, area, hotspot location, contact thermal resistance, adhesive and the final heat-dissipation path. Verify performance through device temperature rise and surface-temperature measurements.
Can a graphite sheet be applied directly to a PCB or exposed terminal?
Direct application without evaluation is not recommended. Graphite is conductive, so confirm the safety clearance and add PET, insulating film or edge protection where needed to prevent short circuits.