ONE
First, clarify: Graphite sheets are uniformly heated, not thermally conductive
- In-plane thermal conductivity: very high, natural graphite 300-600 W/m · K, synthetic graphite 700-1950 W/m · K
- Vertical thermal conductivity: very low, only 3-25 W/m · K
So the function of graphite sheets is to spread out hot spots, not to vertically guide away heat. If there is an air gap in the middle, a thermal pad/silicone grease should be used instead of relying on graphite sheets to cross over.
TWO
Natural graphite vs Synthetic graphite
| Comparison item | Natural graphite paper | Synthetic Graphite Film (PGS) |
| In-plane thermal conductivity | 300–600 W/m·K | 700–1950 W/m·K |
| Thickness | 0.03–1.0 mm | 0.01–0.5 mm |
| Price | Low | Tall |
| Applicable | LED, Electric heating bed, battery, industrial heat dissipation | Mobile phones, 5G, servers, high-end electronics |
Budget sensitive, industrial scenario → Natural graphite paper
Ultra thin, ultimate heat dissipation → Synthetic graphite film
THREE
Select based on 4 key parameters
1.In-plane thermal conductivity
- 300–600：LED, Electric heating bed and power adapter are sufficient
- 600-1000: 5G module, vehicle mounted, power IC
- 1000+: High end synthetic graphite/PGS
2.Thickness
- 0.03-0.1 mm: Mobile phones, wearable devices
- 0.1–0.2 mm：LED, Electric heating bed, power module
- 0.3-1.0 mm: Scenarios requiring more heat capacity
3.Adhesive backing
- Acrylic PSA: long-term 80 ℃, short-term 120 ℃
- Silicone PSA: 180-200 ℃
- No backing adhesive+mechanical fixation: high temperature scenario
4.Insulation
- Bare graphite conducts electricity and will short-circuit when it comes into contact with a circuit
- Insulation required,Choose PI/PET coated version
FOUR
Quickly select by scene
| Application | Recommend |
| Mobile phone/wearable | 0.03-0.08mm synthetic graphite+PET/PI coating |
| LED lights | 0.1-0.2 mm natural graphite paper+silicone PSA |
| Power module | Combination of graphite heat spreader and independent thermal pad |
| Battery pack | 0.1-0.3 mm insulated graphite sheet |
| Electric bed/tatami | 0.1-0.2 mm natural graphite foil+silicone PSA |
FIVE
FAQ
Q: Is it uniform heating or filling?
A: Thermal pads are used for filling joints, and graphite sheets are only used for uniform heating
Q: What is the working temperature?
A: Deciding whether to use acrylic or silicone PSA
Q: Do you want insulation?
A: Touching the line must be covered with film
Graphite sheet selection includes surface thermal conductivity for uniform heating, thermal pads for filling joints, silicone PSA for high temperature, and insulation film for contact lines.
