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Gap Filler Liquids

(GFL)

The constantly increasing technical demands on electrical and electronic assemblies have led to major challenges in the area of thermal management. Due to the miniaturization of components and the higher performance of devices, component temperatures would increase significantly without countermeasures, which could lead to the failure of the entire assembly. In order to increase the longevity of electronic components, the heat must therefore be conducted from the heat source (electronics) to the heat sink (e.g. heat sink). Thermally conductive and electrically insulating intermediate layer materials, so-called Thermal Interface Materials (TIMs), are used for this purpose. With KERATHERM® and KERAMOLD® products, KERAFOL® offers an effective, uncomplicated and cost-effective product range for this purpose. One of the most popular product groups are the so-called Gap Filler Liquids.
Keratherm® GFL 3000 SL
Keratherm® GFL 3030

What are gap filler liquids?

an explanation

KERATHERM® Gap Filler Liquids (GFL) are highly thermally conductive and electrically insulating two-component materials based on silicone or polyurethane. Due to the good flow behavior and the “wet-on-wet” installation, even large component tolerances and gaps can be compensated and bridged, which is a great advantage, especially for sensitive electronic assemblies. Due to the low thermal resistance, the heat is transferred from the heat source (e.g. electronics) to the heat sink (e.g. heat sink) extremely efficiently.

Key Facts

to the GFLs from Kerafol®

  • 2K system
  • Mixing ratio 1:1
  • Different polymer bases possible, silicone-containing and silicone-free
  • Wide range of thermal conductivity (from 1.5 W/mK to 4.3 W/mK)
  • High electrical insulation strength, from 10 kV/mm up to 20 kV/mm
  • Curing at room temperature
  • Heat-resistant, up to 200 °C
  • Layer thickness from 50 µm to several mm possible
  • Different designs in the area of thixotropy
  • Highly thixotropic
  • Self-levelling gap fillers (GFL 1800 SL and GFL 3000 SL) similar to potting materials
Anwendungsbeispiel
Keratherm® GFU 15

How are gap filler liquids processed?

Application

Gap Filler Liquids from KERAFOL® are available in various containers:
  • Cartridges 50 ml / 200 ml / 400 ml / 1200 ml double cartridges
  • Doses 0.5 kg / 1.0 kg doses
  • Hobbocks up to 34.5 kg

In addition to manual application with pneumatic or electric dispensing guns (e.g. manufacturer/link), gap fillers can also be applied fully automatically using dispensing systems.
During application, it is always important to ensure that the two components are mixed homogeneously, which can be easily checked visually thanks to the color gradient.

Further information on dispensing technology and screen printing can be found in the section Service Kerafol.

Video: Application

Advantages

the GFL from Kerafol®

  • Wide range of products for different requirement profiles
  • High heat and long-term resistance
  • Good adhesion and cohesion
  • Low pressure required for compression due to "wet-on-wet installation", a great advantage especially for sensitive electronic applications
  • Due to the low viscosity and the resulting good flow behavior, automation of the application (e.g. by dosing systems) can be implemented quite easily according to the state of the art
  • High availability
  • 100% Made in Germany

Delimitation

to other products

Gap filler liquids are cross-linking systems and therefore harden in contrast to heat-conducting pastes.
This makes them more robust and durable compared to pastes, especially under high mechanical loads such as vibrations or different expansion coefficients of the joining partners (keyword “CTI mismatch”).
After cross-linking, they have similar properties to a gap pad and take on the function of an elastomer due to their Shore 00 hardness.
The filling level and density of gap fillers is very high, and the choice of fillers is always based on the fact that they must be easy to dose.
In terms of the gap to be bridged over a certain area, gap fillers are a more cost-effective alternative than gap pads, also because the material utilization is higher (e.g. there is no material loss due to punching residues).
However, this is offset by the investment costs for a dosing system.

Keratherm® GFL 3020

Comparison

Thermal Gap Filler Liquids from Kerafol®

to the complete overview

GFL 3020 & GFL 3020 RF

Gap Filler Liquid

  • Room temperature curing
  • Easy to process and dispense
  • High material utilization
  • Very soft and elastic
  • Very good price performance ratio

GFL 3030 & GFL 3040

Gap Filler Liquid

  • Room temperature curing
  • Very high thermal performance
  • Highly thixotropic
  • High material utilization

GFL 1800 SL

Gap Filler Liquid

  • Room temperature curing
  • Higher thermal conductivity in comparison to potting material
  • Usage for encapsulation, electromagnetic coils and applications with small fabrication tolerances
  • Low Viscosity Gap Filler Liquid

GFL 3000 SL

Gap Filler Liquid

  • Room temperature curing
  • Higher thermal conductivity in comparison to potting material
  • Usage for encapsulation, electromagnetic coils and applications with small fabrication tolerances
  • High thermal performance
  • Low Viscosity Gap Filler Liquid

GFU 15 silicone free

Gap Filler Liquid

  • Room temperature curing
  • Liquid assembly
  • silicone free
  • Contains no diisocyanate
  • 1:1 Mixing ratio

Applications

from Gap Filler Liquids

  • In many power electronics applications and many other electronic assemblies
  • Batteries, busbars
  • For high component tolerances / large gap dimensions
  • Efficient solution, especially for higher quantities
  • When automated component application is required

Energy

Automotive & Mobility

Consumer Market

Industry

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