eGRAF® HITHERM™ HT-2510
eGRAF HITHERM HT-2510 is a flexible polymer-enhanced graphite thermal interface material with a typical thickness of 0.25 mm (0.010″) and through-plane / in-plane thermal conductivity of 16 / 120 W/m·K at 700 kPa. The material delivers thermal impedance of 0.58 K-cm²/W at 200 kPa and 0.41 K-cm²/W at 700 kPa across an operating temperature range of -25°C to +125°C. UL 94 V-0 flammability rated, RoHS compliant, and lead free.
Key Properties
- Thermal Conductivity @ 700 kPa (Through-Plane • In-Plane): 16 • 120 W/m·K
- Thermal Impedance @ 200 kPa: 0.58 K-cm²/W
- Thermal Impedance @ 700 kPa: 0.41 K-cm²/W
- Hardness: 85 Shore A
- Operating Temperature: -25°C to +125°C
- Typical Thickness: 0.25 mm (0.010″) ± 5%
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Thermal Properties
| Property | Value | Test Method |
| Typical Thermal Conductivity @ 700 kPa — Through-Plane | 16 W/m·K | ASTM D5470 Modified |
| Typical Thermal Conductivity @ 700 kPa — In-Plane | 120 W/m·K | Angstrom’s Method |
| Thermal Impedance @ 200 kPa | 0.58 K-cm²/W | ASTM D5470 Modified |
| Thermal Impedance @ 700 kPa | 0.41 K-cm²/W | ASTM D5470 Modified |
| Operating Temperature | -25°C to +125°C | — |
| Specific Heat @ 25°C | 0.71 J/g·°C | — |
| Coefficient of Thermal Expansion — In-Plane | -0.4 ppm/°C | — |
| Coefficient of Thermal Expansion — Through-Plane | 27.0 ppm/°C | — |
Physical Properties
| Property | Value | Test Method |
| Typical Thickness | 0.25 mm (0.010″) ± 5% | — |
| Hardness | 85 Shore A | — |
Electrical Properties
| Property | Value | Test Method |
| Electrical Resistivity — In-Plane | 80 µΩm | ASTM C6111.4 |
| Electrical Resistivity — Through-Thickness | 1550 µΩm | ASTM C6111.4 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flammability Rating | 94V-0 | UL 94 |
Adhesive Coating Option — Adhesive “A”
| Property | Value | Test Method |
| Nominal Thickness | 0.008 mm / 0.0003″ | — |
| Operating Temperature | -40°C to +150°C | — |
| Thermal Impedance per Side @ 110 kPa | 0.16 cm²·°C/W | ASTM D5470 Modified |
| Adhesive Strength — Typical | 700 g/cm² | ASTM D3163 (lap shear on glass) |
| Adhesive Strength — Minimum | 450 g/cm² | ASTM D3163 (lap shear on glass) |
Compliance & Material Composition
| Property | Value | Test Method |
| RoHS Compliant | Yes | — |
| Halogen Free | No | — |
| Lead Free | Yes | — |
Compliance
- UL 94 — Compliant (V-0)
- RoHS — Compliant
- Lead Free
- Thermal interface between heat-generating components and heatsinks in consumer electronics
- Die-cut thermal pads for electronics and mobile assemblies
- Laminated thermal interface constructions with plastic or adhesive carriers
- Low contact resistance interfaces where elevated through-plane conductivity is required
- Mid-bondline thermal management where 0.25 mm bulk is required, operating under +125°C
Common industries: electronics, consumer electronics, telecommunications, and thermal management for portable devices.
eGRAF HITHERM HT-2510 is the 0.25 mm flexible polymer-enhanced graphite grade within the HITHERM HT-2500 series, engineered for applications that require low thermal contact resistance combined with elevated through-plane thermal conductivity. The polymer enhancement increases through-plane heat transport compared to the pure graphite HT-1200 series, at the trade-off of a narrower operating temperature window. The material can be easily die-cut and laminated with a variety of plastics and adhesives to support diverse design and assembly requirements.
HT-2510 provides additional bulk for assemblies that need to bridge larger bondline gaps than the 0.127 mm HT-2505.
Thermally, the material delivers through-plane conductivity of 16 W/m·K and in-plane conductivity of 120 W/m·K at 700 kPa, with thermal impedance of 0.58 K-cm²/W at 200 kPa and 0.41 K-cm²/W at 700 kPa across an operating temperature range of -25°C to +125°C. Mechanically, the material has a 85 Shore A hardness, with a coefficient of thermal expansion of -0.4 ppm/°C in-plane and 27.0 ppm/°C through-plane. Electrical resistivity is 80 µΩm in-plane and 1550 µΩm through-thickness.
Specific heat is 0.71 J/g·°C at 25°C. An optional Adhesive “A” coating is available at 0.008 mm nominal thickness, with an operating temperature of -40°C to +150°C, thermal impedance per side of 0.16 cm²·°C/W at 110 kPa, and adhesive strength of 700 g/cm² typical / 450 g/cm² minimum (lap shear on glass per ASTM D3163).
Compliant with UL 94 V-0 flammability, RoHS, and lead-free requirements. The material is not halogen free. Test methods include Angstrom’s Method (in-plane conductivity), ASTM D5470 Modified (through-plane conductivity and thermal impedance), ASTM C6111.4 (electrical resistivity), and ASTM D3163 (adhesive lap shear).
What differentiates HT-2510 from HT-2505 or the pure graphite HT-1200 series?
HT-2510 is the 0.25 mm polymer-enhanced graphite grade — the thicker of the two HT-2500 series options — and is selected when the assembly needs additional bulk than the 0.127 mm HT-2505 can provide. Thermal impedance at 700 kPa is 0.41 K-cm²/W versus 0.24 for HT-2505 due to the additional thickness, with the same through-plane and in-plane conductivity. Compared to the pure graphite HT-1200 series, HT-2510 offers higher through-plane thermal conductivity (16 W/m·K vs 10 W/m·K) but a narrower operating range (-25°C to +125°C vs -40°C to +400°C) and is not halogen free.
Why does thermal conductivity matter in material selection?
he function of a thermal interface material is to move heat from a component to a heatsink with minimum temperature rise. Thermal conductivity sets the bulk heat transport, and thermal impedance — which also captures contact resistance — determines real-world performance at a given bondline and pressure. HT-2510 provides 16 W/m·K through-plane and 120 W/m·K in-plane at 700 kPa, with thermal impedance of 0.41 K-cm²/W at 700 kPa, prioritizing vertical heat extraction.
What is the operating temperature range for HT-2510?
The operating temperature range is -25°C to +125°C. With the optional Adhesive "A" coating, the adhesive layer itself is rated for -40°C to +150°C; assembled operating range is bounded by the base material.
Is HT-2510 suitable for flame-rated and RoHS-regulated environments?
Yes. HT-2510 is rated UL 94 V-0 for flammability and is RoHS compliant and lead free, making it suitable for consumer electronics, telecom, industrial, and other regulated assemblies. Note that HT-2510 is not halogen free; specify the pure graphite HT-1200 series if a halogen-free material is required.
How should HT-2510 be specified?
Specify grade (HT-2510), thickness (0.25 mm), adhesive option (with or without Adhesive "A" coating), part geometry (die-cut, kiss-cut, or sheet), compliance requirements (UL 94 V-0, RoHS, lead free), dimensional tolerances, and finished format.
