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Honeywell HT5000 silicone based one-part thermal gel - Gap Filler provides a thermal conductivity of 5.0 W/m·K along with high conformability and high compressibility. It is one of the most popular thermal gels, formulated to deliver high dispense rates for improved productivity, long-term reliability performance and easy reworkability. The thickness range to prevent slumping in vertical position is 0.3-1.5mm. This is a non factor when components are mounted horizontally.
Honeywell HT5000 is designed to minimize thermal resistance at interfaces, maintain excellent performance through reliability testing, and provide scalable application at a competitive cost. The minimum bondline thickness that it can reach is 0.05mm with a Thermal Impedance of 0.25. Additionally it performs great in oil,crack and slump testing and it exhibits no pump out and cracking risk.
HT5000 - Oil bleeding comparison
HT5000 - Crack and Slump testing
Minimum BLT for HT 5000 is around 0.15mm. Maximum BLT is a function of the size of the components being attached and pressure. A reasonable value could be 1mm