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Honeywell HT4500 is a pre cured dispensable/printable gap filler which is silicone-based and filled with advanced ceramic fillers. It is formulated to deliver high dispense rate for improved productivity, good gap filling ability under low pressure and low contamination to devices. The viscosity is modified and developed specifically to allow it to be integrated into printing processes. The material is designed to minimise thermal resistance at interfaces and maintain excellent performance through reliability testing.
Honeywell HT4500 is designed for those that prefer the reliability of a gel material for their printing processes. The low viscosity that enables printing removes the need for expensive dispensing equipment and makes for a good alternative for thermal greases that often exhibit pump out or dry out issues. As an additional bonus, HT4500 has been extensively tested and passed the rigorous vibration tests that are required by the automotive industry. HT4500 has excellent thermal stability after different long term reliability tests including, D85( 85 ̊C&85%RH) 1000hrs, Thermal Shock 1000cycles and HTB(High Temperature Baking)150 ̊C 1000hrs.Honeywell HT4500 is a soft, printable gel that can be applied like grease using screen printing. There is almost no stress when being compressed and compression-deflection is difficult to measure. Slumping is a concern when bondline thickness is high; especially if the boards are vertically mounted. For HT4500, we recommend less than 1mm( in vertical position) to prevent slumping but thickness is not a concern at all when boards are horizontally mounted.
Minimum BLT for HT 4500 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