As electronics move toward higher power density, greater integration, and smaller form factors, effective thermal management is becoming increasingly critical.

At the same time, variations in component height, assembly tolerances, and complex interface geometries can make it difficult for conventional thermal interface materials (TIMs) to maintain consistent contact.

Thermal gel provides a dispensable, gap-filling TIM solution that conforms to complex interfaces while supporting automated assembly. By adjusting material placement and bond line thickness to the actual interface, thermal gel can help address variable gaps and uneven surfaces in high-density electronic assemblies.

1. Why Thermal Gel?

Unlike pre-formed thermal pads, thermal gel can be dispensed directly onto the target interface. This allows the material coverage and bond line thickness to be tailored to the component geometry and assembly conditions.

Thermal gel is particularly suitable for applications involving:

• Variable or uneven interface gaps
• Complex component geometries
• Assembly tolerances
• Low assembly pressure
• Automated dispensing

Depending on the formulation, a cured thermal gel can retain a degree of flexibility and compliance, helping accommodate dimensional variation while reducing mechanical constraint on sensitive components.

For automated production, however, thermal conductivity is only one part of the material selection process. Rheology, thixotropy, dispensing stability, extrusion behavior, cure characteristics, and long-term reliability can be equally important.

For high-volume manufacturing, the key is to achieve a reliable balance between thermal performance, interface conformity, processability, and production efficiency.

2. Singleton TGL Series Thermal Gel Solutions

Singleton's TGL Series is designed for thermal management applications ranging from general power electronics to high-heat-flux and reliability-critical electronic systems.

TGL120DF / TGL150DF: Thermal Performance with Production Efficiency

SG TGL120DF and SG TGL150DF deliver thermal conductivity of 12 W/m·K and 15 W/m·K, respectively, using Singleton's proprietary ceramic filler system without diamond-based fillers.

Compared with highly abrasive diamond fillers, the specialized ceramic filler system offers more moderate abrasive characteristics. This can help reduce wear on fluid-contact components, such as dispensing needles and pumps, during continuous automated dispensing, supporting stable long-term production and reducing equipment maintenance requirements.

In addition, the absence of diamond fillers eliminates potential concerns associated with hard diamond particles at the device interface, helping minimize the risk of surface scratching and localized mechanical damage during assembly and thereby supporting package reliability.

This makes TGL120DF and TGL150DF suitable for applications where thermal performance, dispensing reliability, equipment compatibility, and cost efficiency must be considered together.

Key Features

• 12 / 15 W/m·K thermal conductivity
• Ceramic filler system for balanced thermal and dispensing performance
• Low assembly pressure for interfaces with dimensional variation
• Production-oriented performance and cost balance
• Compatible with automated dispensing

Typical Applications

• EV power electronics
• Energy storage systems
• Charging systems
• Industrial power supplies
• High-power electrical equipment

For applications requiring a practical balance between thermal performance and manufacturing efficiency, TGL120DF and TGL150DF provide scalable thermal gel solutions for volume production.

TGL180: For High Heat Flux and Reliability-Critical Applications

For applications with higher thermal loads and more demanding reliability requirements, SG TGL180 features an advanced composite filler system with thermal conductivity of up to 18 W/m·K.

Its controlled rheology enables automated dispensing into irregular or variable gaps between heat-generating components and cooling structures such as heat spreaders, housings, and cold plates. Under appropriate assembly conditions, the material conforms to the interface and helps minimize air gaps that can increase thermal resistance.

SG TGL180 has been evaluated under reliability conditions including high-temperature aging, 85°C/85% RH damp heat, and temperature cycling to assess thermal and environmental stability.

The formulation also provides low volatility, low bleed-out, and electrical insulation, supporting applications where material stability and electrical performance are critical.

Key Features

• Up to 18 W/m·K thermal conductivity
• High thermal performance for high-heat-flux applications
• Compliant interface with low assembly pressure
• Stable dispensing for automated production
• Thermal and environmental stability
• Low volatility and low bleed-out
• Electrical insulation

Typical Applications

• Optical communications
• Optical transceivers and modules
• AI computing infrastructure
• Advanced automotive electronics
• Power semiconductors
• High-end energy storage systems
• RF communication equipment

For high-density electronic assemblies where thermal performance, interface conformity, and long-term reliability must be addressed simultaneously, TGL180 is designed for demanding thermal management applications.

3. How to Select the Right Thermal Gel

Thermal gel selection should not be based on thermal conductivity alone. The appropriate TIM depends on the thermal design, interface gap, assembly pressure, dispensing process, and reliability requirements.

Actual thermal performance depends on the complete interface design, including bond line thickness, contact area, assembly pressure, surface condition, and heat-source geometry.

For this reason, final material selection should be validated through application-specific thermal resistance testing, dispensing trials, assembly evaluation, and reliability testing.

4. Thermal Interface Solutions Designed for Application

The performance of a thermal interface material depends on more than its nominal thermal conductivity. In practical applications, material properties, interface design, and manufacturing processes must work together.

Singleton's TGL Series provides different performance options for different application requirements:

TGL120DF / TGL150DF
Designed to balance thermal performance, dispensing compatibility, and production economics for EV power electronics, energy storage, charging systems, and industrial power applications.

TGL180
Designed for high-heat-flux and reliability-critical applications such as optical communications, AI computing infrastructure, advanced automotive electronics, and power semiconductors.

From material selection and interface design to automated dispensing, Singleton works with customers to develop thermal interface solutions aligned with their specific application and manufacturing requirements.

Contact the Singleton technical team for product specifications, test data, and application recommendations.