Gap Filler Liquid
Click here to see our series in the Gap Filler Liquid range.
Discover nowKERAFOL® Gap Filler Liquids: Efficient Thermal Management
The miniaturization and performance increase of modern electronics pose major challenges for thermal management.
Without effective heat dissipation, overheating can drastically shorten component lifespan or cause system failure. To ensure the reliability and longevity of your electronics, efficient heat transfer from the heat source (e.g., chip) to the heat sink is essential. This is where Thermal Interface Materials (TIMs) come into play.
alfatec GmbH & Co. KG offers high-performance KERATHERM® Gap Filler Liquids (GFL) from KERAFOL®, a flexible and powerful solution developed for engineers, technicians, and buyers who demand top-tier thermal conductivity and electrical insulation.
What Are KERATHERM® Gap Filler Liquids?
KERATHERM® Gap Filler Liquids are highly thermally conductive and electrically insulating two-component materials. Based on silicone or polyurethane (as a silicone-free option), they are applied as a cross-linking system.
Their standout feature is excellent flowability, allowing them to fill large component tolerances, uneven surfaces, and gaps. Often applied “wet-on-wet” during assembly, they are ideal for sensitive electronic assemblies.
Their very low thermal resistance ensures efficient heat transfer from the component to the heat sink, optimizing operational safety and performance.
Already know what you're looking for?
Click here to go directly to our selection and data sheets for product series in the Gap Filler Liquids section.
To the series search
Technical Parameters of KERATHERM® GFLs at alfatec
KERAFOL® gap filler liquids, available from alfatec, offer a range of impressive technical advantages:
- Reliable 2K system: Simple 1:1 mixing ratio
- Flexible base: Available in silicone and silicone-free (polyurethane) versions
- High thermal conductivity: Ranges from 1.5 W/mK to 4.3 W/mK
- Excellent electrical insulation: Dielectric strength from 10 kV/mm to 20 kV/mm
- User-friendly curing: Room temperature cross-linking, no heat required
- High temperature resistance: Usable up to 200°C
- Mechanical decoupling: Reduces stress on components due to elastomeric properties
- Automation-ready: Ideal for series production via dispensing
Product Overview: KERATHERM® GFLs at alfatec
alfatec offers a selection of KERATHERM® GFLs for different requirements in terms of heat conduction and processing:
| Product | Thermal Conductivity (W/mK) | Dielectric Strength (kV/mm) | Density (g/cm³) | Hardness (Shore 00) | Typical Application |
|---|---|---|---|---|---|
| GFL 3040 | 4.3 | 5.0 | 3.05 | 65 - 85 | Highest thermal conductivity for demanding tasks |
| GFL 3030 | 3.0 | 6.0 | 2.94 | 65 - 85 | High performance, versatile use |
| GFL 3020 RF | 2.0 | 10.0 | 2.4 | 45 - 60 | Balanced thermal and electrical properties |
| GFL 3020 | 1.8 | 10.0 | 2.3 | 45 - 60 | Standard performance, good insulation |
| GFL 1800 SL | 1.8 | 7.5 | 2.3 | 55 - 75 | Silicone-free, good all-round properties |
| GFL 3000 SL | 2.8 | 8.0 | 2.54 | 30 - 40 | Silicone-free, higher thermal conductivity |
GFL vs. Thermal Paste and Gap Pads
Gap filler liquids offer specific advantages over other TIMs:
- GFL vs. Thermal Paste: Unlike non-curing pastes, GFLs cure into a flexible elastomer, offering better mechanical resilience and tolerance to CTE mismatch.
- GFL vs. Gap Pads: GFLs conform to complex geometries and are often more cost-effective due to better material utilization. However, pads are easier to apply manually.
Application & Processing
KERATHERM® GFLs are available in various packaging formats:
- Dual cartridges: 50 ml, 200 ml, 400 ml, 1200 ml – for manual or semi-automatic application
- Cans: 0.5 kg, 1.0 kg – for small batches or manual mixing
- Hobbocks: Up to 34.5 kg – for fully automated dispensing in mass production
Application can be manual (pneumatic/electric dispensers) or automated. A homogeneous 1:1 mix is essential. KERAFOL® supports this with a color indicator for visual mixing control.
Our partner for gap filler liquid
Kerafol
Our partner KERAFOL offers a wide range of thermally conductive films and potting materials, which are used in microelectronics and sensor technology, among other things. The company develops and produces in Germany and, in addition to established standard products, also offers customised solutions, which can optionally be implemented silicone-free and after an automatic punching process.
Optimize Your Thermal Management with GFLs
Improve heat dissipation, boost performance, and extend component life with KERATHERM® Gap Filler Liquids from KERAFOL®, delivered by alfatec.
Request your personalized quote now
See for yourself the quality and performance of our gap filler liquids. Request a no-obligation quote today or download the data sheets.
alfatec – your partner for high-quality electronic components
As your expert partner for electronic components, alfatec supports you in selecting the right gap filler liquids for your applications. We offer comprehensive advice and are happy to answer any questions you may have about power modules.
Do you have questions about our gap filler liquids or would you like a personal consultation? Feel free to contact us.