Thermal gap fillers have become essential in modern electronics design, providing a reliable path for heat to move from hot components to cooling hardware. For years, Laird’s TFLEX SF600 and TFLEX SF800 have been widely used in applications where consistent performance, conformability, and availability are critical.
But as power densities continue to rise, newer materials like TFLEX SF4, SF7, and SF10 are setting the standard for next-generation designs.
TFLEX SF600: A Trusted Standard
TFLEX SF600 has been a long-standing choice for engineers who need a balance of thermal performance and mechanical stability.
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Thermal Conductivity: 3.0 W/m·K
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Color: Pink
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Available Thicknesses: 0.010″ – 0.140″
Its combination of conductivity and moderate softness allows it to handle a wide range of power devices while maintaining good mechanical integrity.
TFLEX SF800: Softer and More Powerful
TFLEX SF800 raises the bar with significantly higher conductivity and a softer profile. It is ideal for applications where both thermal transfer and mechanical compliance are critical.
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Thermal Conductivity: 7.8 W/m·K
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Color: Gray
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Available Thicknesses: 0.020″ – 0.160″
The higher conductivity and softness make SF800 particularly effective in high-density assemblies with varied component heights or delicate packages.
Looking Ahead: TFLEX SF4, SF7, and SF10
While SF600 and SF800 continue to perform reliably in existing designs, new projects should strongly consider the newer TFLEX series materials. These options extend conductivity and softness to match today’s escalating thermal demands.
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TFLEX SF4
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Thermal Conductivity: 4.0 W/m·K
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Balanced choice for moderate power densities.
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TFLEX SF7
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Thermal Conductivity: 7.8 W/m·K
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A modern alternative to SF800, designed for higher-performance systems.
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TFLEX SF10
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Thermal Conductivity: Rated 10.0 W/m·K (but in testing has hit ~12.0 W/m·K — twice confirmed).
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Color: Gray
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Available Thicknesses: 0.020″ – 0.200″
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Ideal for extreme power density environments where both conductivity and softness are required.
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With SF10 delivering double-digit conductivity in real-world tests, it stands out as one of the most powerful gap fillers available.
Why Partner with NEDC
As an approved Laird converter, NEDC provides custom die-cut solutions for TFLEX SF600, SF800, and the SF4/SF7/SF10 series. Customers benefit from genuine materials, cut to exact specifications, with the quality assurance that comes from decades of thermal management expertise.
In summary:
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TFLEX SF600 (3 W/m·K, Pink) → proven and reliable.
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TFLEX SF800 (7.8 W/m·K, Gray) → higher conductivity, softer, widely used.
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TFLEX SF4/SF7/SF10 → next-gen solutions, with SF10 reaching up to ~12 W/m·K in real-world testing.
For legacy builds, SF600 and SF800 remain trusted. For new designs, the future is clearly with SF4, SF7, and SF10 — and NEDC is ready to provide them in custom-cut formats for any application.