3.0 W/mK Non-Curing Electrically Insulating Thermal Grease Thermal Conductive Silicone Grease for Inverter Server Power Cooling

HN300 is a single-component, non-curing, high thermal conductivity insulating silicone grease developed for production-line heat dissipation of power electronics. It almost never cures, keeps its paste state from -40 C to +180 C, and combines excellent electrical insulation with 3.0 W/mK thermal conductivity. With near-zero free radical content it resists high and low temperatures, water, ozone and weathering, delivers low oil separation and low volatility at 200 C, and is safe, non-toxic, odourless, non-corrosive and RoHS 2.0 compliant.

• 3.0 +/- 0.1 W/mK thermal conductivity tested to ASTM D5470, thermal resistance as low as 0.82 C cm2/W at 25 PSI for thin bond line assembly.
• Non-curing paste: maintains dispensing consistency indefinitely, no hardening, no rework damage at service temperature -40 C to +180 C.
• 1850 V/mm dielectric strength (IEC 60243, 0.20 mm) for electrically insulating interfaces on live IGBT, thyristor and power module assemblies.
• Long-term thermal stability: no powdering after 8 days continuous baking at 200 C, no drying after 5-6 h at 280 C on 0.2 mm film.
• Low oil bleed and low volatility: oil separation max 0.3%, volatile matter max 0.7% at 200 C / 24 h, minimising pump-out and fogging in sealed enclosures.
• Process ready: suitable for brushing, rolling, automatic dispensing and screen printing, with 350 +/- 20 penetration (1/10 mm) for stable dispensing volumes.

All values are measured under standard conditions and are for reference only. Actual thermal performance varies with application conditions, bond line thickness and contact pressure.

HN300 is formulated for the thermal interface between heat-generating elements and heat dissipation hardware in electronic and electrical equipment, including:

• Power semiconductor cooling: IGBT modules, power modules, power transistors, thyristors, MOSFET assemblies, rectifier bridges, solid state relays.
• Power conversion equipment: inverters, servo drives, motor drives, variable frequency drives, solar inverters, UPS systems, welding machines, EV charging piles, switching power supplies, voltage regulators, power supply modules.
• Computing and data infrastructure: CPU and GPU heat sinks, server and data center boards, telecom base station units, power amplifiers, high density graphics cards.
• Sensing and instrumentation: thermistors, temperature sensors, thermal coupling surfaces, printer heads and thermal print bars, sensor housings.
• Automotive and appliance electronics: automotive electronics, car refrigerators, EV battery pack interfaces, LED lamps, LED drivers, lighting heat sinks.
• RF and microwave systems: surface coating or overall potting of microwave devices, microwave communication units, microwave transmission equipment and microwave power supplies.

• Production-line packaging: 1 kg and 5 kg plastic drums as standard; custom drum sizes, cartridges and syringes available on request.
• OEM / ODM support: thermal conductivity grade, colour, penetration and viscosity, filling weight and private label printing can be customised to your specification.
• Batch documentation: TDS HANAST-TDS-020 Rev.1 and RoHS 2.0 compliance statements supplied with every shipment; additional test reports on request.
• Stable supply: 5000 kg monthly capacity, 3-5 working days for stock drums, 12-18 days for bulk production orders.
• Shelf life: 12 months from manufacture date in unopened original packaging stored below 27 C; stir thoroughly if minor oil separation occurs.

1. Clean all contact surfaces with a solvent to remove grease, dust and oxidation, then dry completely.
2. Apply by brush, roller, automatic dispenser or screen printing, and spread evenly to the required thickness.
3. Keep the layer as thin as possible - excess grease reduces heat transfer efficiency; wipe excess from edges with a lint-free cloth.
4. Assemble the heat sink or heat source immediately after application and torque fasteners to specification to control bond line thickness.
5. For industrial use only: wear nitrile gloves and safety goggles, ensure ventilation, keep containers sealed and store away from food and children.

Request a sample, batch TDS or OEM quotation for HN300 thermal conductive silicone grease - our technical team will confirm the conductivity grade, packaging and delivery schedule for your programme.