Applications

DOWSIL™ TC-4060 GB250 Thermal Gel – Thermally conductive silicone gel for automotive and telecom electronic cooling applications

Item Name: DOWSIL™ TC-4060 GB250 Thermal Gel
Manufacturer: Dow
Technologies: Two-part silicone thermal gel (addition-cure, PDMS-based, highly thermally conductive)
Color: Part A – White, Part B – Blue
Cure Type: Room temperature cure, heat accelerated
Package Size: Contact to Techniq VN for details.
Shelf Life: 12 months

1. Product Overview

DOWSIL™ TC-4060 GB250 is a two-part, room-temperature curing silicone gel with 6–6.5 W/m·K thermal conductivity. It contains high-purity glass beads (250 μm) (with a GB-free option available). Once cured, it forms a soft, stress-relieving, and shock-damping elastomer designed for automotive and telecom thermal management. It cures without exotherm, is stable up to 150°C, and provides long-term dielectric insulation and mechanical protection.


2. Applications

  • Heat dissipation in automotive ECUs and telecom PCB assemblies

  • Gap-filling & stress relief between components and heat sinks

  • Reliable cooling solution with shock and vibration damping

  • Compatible with automated dispensing using meter-mix equipment

3. Typical Properties

Property Unit Part A Part B Mixed Cured
Mix Ratio 1:1
Appearance White Blue
Viscosity @1s⁻¹ mPa·s 390,000 460,000 426,000
Viscosity @10s⁻¹ mPa·s 140,000 140,000
Specific Gravity 3.5 3.5
Pot Life (22°C) min 80
Cure Time h/min 24 h @22°C / 30 min @80°C
Durometer Shore 00 55–58
E’ Modulus (DMA) MPa 0.2
Tensile Strength MPa 0.05
Thermal Conductivity W/m·K 5.6 – 6.5
CTE ppm/°C 233 ± 59
Volatile Siloxane Content ppm < 100
Dielectric Strength kV/mm 8.5
Volume Resistivity ohm·cm 4 × 10¹²
Dielectric Constant (10 MHz–20 GHz) 7.78
Flammability (UL-94) V-0
Comparative Tracking Index (IEC 60112) V > 600
Shelf Life (<40°C) days 360

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