Graphite Thermal Management (NeoGraf®)
Graphite thermal management materials are the material of choice when in-plane heat spreading in electronics, EV battery modules, or avionics must achieve thermal conductivities that polymer-based TIM pads cannot approach — particularly in space- and weight-constrained assemblies where copper spreaders are too heavy. Natural and synthetic graphite foils deliver in-plane thermal conductivity from 350 to over 800 W/m·K at areal weights a fraction of metal alternatives, with compressible synthetic grades providing conformable contact at component-to-heatsink interfaces. H-O Products carries the full range of NeoGraf® graphite thermal families, from SpreaderShield® natural graphite foil and pure high-temperature graphite through eGraf® HiTherm® synthetic graphite TIM and polymer-enhanced grades, and converts them to customer specification.
SPREADERSHIELD-FLX™ SSFLX300-0.51-P1GP1A1
SPREADERSHIELD-FLX™ SSFLX300-0.51-P1GP1A1 is an eGRAF® flexible graphite heat spreader and heat shield with a 300 W/m·K in-plane and 3.4 W/m·K through-plane thermal conductivity, consisting of a 0.51 mm graphite layer with PET film coating (0.025 mm) on top and PET film adhesive (0.080 mm) on the bottom for a total spreader thickness of 0.71 mm. It delivers a thermal contact impedance of 8.1 °C·cm²/W per side, a dielectric strength of 2500 V, a minimum bend radius of 6.4 mm, and an operating temperature of -40°C to +150°C. The material is UL 94V-0 rated and RoHS compliant.
Key Properties
- Thermal Conductivity — In-Plane: 300 W/m·K
- Thermal Conductivity — Through-Plane: 3.4 W/m·K
- Thermal Contact Impedance Per Side: 8.1 °C·cm²/W
- Operating Temperature: -40°C to +150°C
- Graphite Thickness / Spreader Thickness: 0.51 mm / 0.71 mm
- UL Flammability Rating: 94V-0
SPREADERSHIELD-FLX™ SSFLX300-0.94-P1GP1A1
SPREADERSHIELD-FLX™ SSFLX300-0.94-P1GP1A1 is an eGRAF® flexible graphite heat spreader and heat shield with a 300 W/m·K in-plane and 4.2 W/m·K through-plane thermal conductivity, consisting of a 0.94 mm graphite layer with PET film coating (0.025 mm) on top and PET film adhesive (0.080 mm) on the bottom for a total spreader thickness of 1.25 mm. It delivers a thermal contact impedance of 7.0 °C·cm²/W per side, a dielectric strength of 3500 V, a minimum bend radius of 6.4 mm, and an operating temperature of -40°C to +150°C. The material is UL 94V-0 rated and RoHS compliant.
Key Properties
- Thermal Conductivity — In-Plane: 300 W/m·K
- Thermal Conductivity — Through-Plane: 4.2 W/m·K
- Thermal Contact Impedance Per Side: 7.0 °C·cm²/W
- Operating Temperature: -40°C to +150°C
- Graphite Thickness / Spreader Thickness: 0.94 mm / 1.25 mm
SpreaderShield™ SS350
SpreaderShield™ SS350 is a natural graphite flexible heat spreader and heat shield with an in-plane thermal conductivity of 350 W/m·K and a through-plane thermal conductivity of 4.1 W/m·K, available in thicknesses from 0.127 to 0.94 mm. It delivers a thermal contact impedance of 0.34 °C·cm²/W per side at 0.51 mm, an in-plane electrical conductivity of 1,750 S/cm, and an operating temperature range of -40°C to +400°C. The material is UL 94V-0 rated and RoHS compliant.
Key Properties
- Thermal Conductivity — In-Plane: 350 W/m·K
- Thermal Conductivity — Through-Plane: 4.1 W/m·K
- Thermal Contact Impedance Per Side: 0.34 °C·cm²/W @ 0.51 mm thickness
- Operating Temperature Range: -40°C to +400°C
- Thickness Capability Range: 0.127 – 0.94 mm
- UL Flammability Rating: 94V-0
SpreaderShield™ SS400
SpreaderShield™ SS400 is a natural graphite flexible heat spreader and heat shield with an in-plane thermal conductivity of 400 W/m·K and a through-plane thermal conductivity of 3.7 W/m·K, available in thicknesses from 0.050 to 0.94 mm — the broadest thickness range in the natural graphite series. It delivers a thermal contact impedance of 0.38 °C·cm²/W per side at 0.51 mm, a tensile strength of 9.7 MPa, an in-plane electrical conductivity of 1,900 S/cm, and an operating temperature range of -40°C to +400°C. The material is UL 94V-0 rated and RoHS compliant.
Key Properties
- Thermal Conductivity — In-Plane: 400 W/m·K
- Thermal Conductivity — Through-Plane: 3.7 W/m·K
- Thermal Contact Impedance Per Side: 0.38 °C·cm²/W @ 0.51 mm thickness
- Operating Temperature Range: -40°C to +400°C
- Thickness Capability Range: 0.050 – 0.94 mm
- UL Flammability Rating: 94V-0
SpreaderShield™ SS500
SpreaderShield™ SS500 is a natural graphite flexible heat spreader and heat shield with an in-plane thermal conductivity of 500 W/m·K and a through-plane thermal conductivity of 2.8 W/m·K, available in thicknesses from 0.076 to 0.40 mm. It delivers a thermal contact impedance of 0.90 °C·cm²/W per side at 0.102 mm, a tensile strength of 7.7 MPa, an in-plane electrical conductivity of 2,400 S/cm, and an operating temperature range of -40°C to +400°C. The material is UL 94V-0 rated and RoHS compliant.
Key Properties
- Thermal Conductivity — In-Plane: 500 W/m·K
- Thermal Conductivity — Through-Plane: 2.8 W/m·K
- Thermal Contact Impedance Per Side: 0.90 °C·cm²/W @ 0.102 mm thickness
- Operating Temperature Range: -40°C to +400°C
- Thickness Capability Range: 0.076 – 0.40 mm
SpreaderShield™ SS600
SpreaderShield™ SS600 is a natural graphite flexible heat spreader and heat shield with the highest in-plane thermal conductivity in the natural graphite series at 600 W/m·K, available in a single standard thickness of 0.127 mm. It delivers a through-plane thermal conductivity of 3.5 W/m·K, a thermal contact impedance of 0.44 °C·cm²/W per side at 0.102 mm, a tensile strength of 9.7 MPa, an in-plane electrical conductivity of 2,900 S/cm, and an operating temperature range of -40°C to +400°C. The material is UL 94V-0 rated and RoHS compliant.
Key Properties
- Thermal Conductivity — In-Plane: 600 W/m·K
- Thermal Conductivity — Through-Plane: 3.5 W/m·K
- Thermal Contact Impedance Per Side: 0.44 °C·cm²/W @ 0.102 mm thickness
- Operating Temperature Range: -40°C to +400°C
- Thickness: 0.127 mm
- UL Flammability Rating: 94V-0
eGRAF® HITHERM™ HT-C3200
eGRAF HITHERM HT-C3200 is a die-cut flexible graphite thermal interface material with in-plane thermal conductivity of 800 W/m·K and through-plane conductivity of 7 W/m·K at 700 kPa. The material delivers thermal impedance of 0.49 K·cm²/W at 200 kPa and 0.18 K·cm²/W at 700 kPa across an operating temperature range of -40°C to +400°C, and its compressibility compensates up to 125 µm of flatness variation between mating surfaces. UL 94 V-0 flammability rated, RoHS compliant, and halogen free.
Key Properties
- Thermal Conductivity @ 700 kPa — In-Plane: 800 W/m·K
- Thermal Conductivity @ 700 kPa — Through-Plane: 7 W/m·K
- Thermal Impedance @ 200 kPa: 0.49 K·cm²/W
- Thermal Impedance @ 700 kPa: 0.18 K·cm²/W
- Operating Temperature: -40°C to +400°C
- Typical Starting Thickness: 200 ± 20 µm / 0.008 ± 0.001"
eGRAF® HITHERM™ HT-1205
eGRAF HITHERM HT-1205 is a flexible pure graphite thermal interface material with a typical thickness of 0.127 mm (0.005") and through-plane / in-plane thermal conductivity of 10 / 150 W/m·K at 700 kPa. The material delivers thermal impedance of 0.59 K-cm²/W at 200 kPa and 0.30 K-cm²/W at 700 kPa across an operating temperature range of -40°C to +400°C. UL 94 V-0 flammability rated, RoHS compliant, halogen free, and lead free.
Key Properties
- Thermal Conductivity @ 700 kPa (Through-Plane • In-Plane): 10 • 150 W/m·K
- Thermal Impedance @ 200 kPa: 0.59 K-cm²/W
- Thermal Impedance @ 700 kPa: 0.30 K-cm²/W
- Hardness: 85 Shore A
- Operating Temperature: -40°C to +400°C
- Typical Thickness: 0.127 mm (0.005") ± 10%
eGRAF® HITHERM™ HT-1210
eGRAF HITHERM HT-1210 is a flexible pure graphite thermal interface material with a typical thickness of 0.25 mm (0.010") and through-plane / in-plane thermal conductivity of 10 / 150 W/m·K at 700 kPa. The material delivers thermal impedance of 0.66 K-cm²/W at 200 kPa and 0.40 K-cm²/W at 700 kPa across an operating temperature range of -40°C to +400°C. UL 94 V-0 flammability rated, RoHS compliant, halogen free, and lead free.
Key Properties
- Thermal Conductivity @ 700 kPa (Through-Plane • In-Plane): 10 • 150 W/m·K
- Thermal Impedance @ 200 kPa: 0.66 K-cm²/W
- Thermal Impedance @ 700 kPa: 0.40 K-cm²/W
- Hardness: 85 Shore A
- Operating Temperature: -40°C to +400°C
- Typical Thickness: 0.25 mm (0.010") ± 5%
eGRAF® HITHERM™ HT-1220
eGRAF HITHERM HT-1220 is a flexible pure graphite thermal interface material with a typical thickness of 0.51 mm (0.020") and through-plane / in-plane thermal conductivity of 10 / 150 W/m·K at 700 kPa. The material is the thickest grade in the HITHERM HT-1200 pure graphite series, operating across a temperature range of -40°C to +400°C. UL 94 V-0 flammability rated, RoHS compliant, halogen free, and lead free.
Key Properties
- Thermal Conductivity @ 700 kPa (Through-Plane • In-Plane): 10 • 150 W/m·K
- Hardness: 85 Shore A
- Operating Temperature: -40°C to +400°C
- Typical Thickness: 0.51 mm (0.020") ± 5%
- Electrical Resistivity (In-Plane • Through-Thickness): 60 • 1230 µΩm
- Flammability: UL 94 V-0
eGRAF® HITHERM™ HT-2505
eGRAF HITHERM HT-2505 is a flexible polymer-enhanced graphite thermal interface material with a typical thickness of 0.127 mm (0.005") and through-plane / in-plane thermal conductivity of 16 / 120 W/m·K at 700 kPa. The material delivers thermal impedance of 0.41 K-cm²/W at 200 kPa and 0.24 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: 0.41 K-cm²/W
- Thermal Impedance @ 700 kPa: 0.24 K-cm²/W
- Hardness: 85 Shore A
- Operating Temperature: -25°C to +125°C
- Typical Thickness: 0.127 mm (0.005") ± 10%
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%
