{"id":3391,"date":"2026-06-06T02:00:07","date_gmt":"2026-06-06T02:00:07","guid":{"rendered":"https:\/\/www.sheenmaterials.com\/?p=3391"},"modified":"2026-06-06T09:13:20","modified_gmt":"2026-06-06T09:13:20","slug":"thermal-interface-materials-selection-framework","status":"publish","type":"post","link":"https:\/\/www.sheenmaterials.com\/it\/thermal-interface-materials-selection-framework\/","title":{"rendered":"Thermal Interface Materials Selection Guide: Why Thermal Conductivity Is Not Enough"},"content":{"rendered":"

After working in the thermal materials industry for more than a decade, I have seen too many engineers treat materiali di interfaccia termica <\/strong>as something to \u201cfill in at the end.\u201d<\/p>\n\n\n\n

They carefully select heat sinks.
They calculate fan performance.
They evaluate liquid cooling solutions.<\/p>\n\n\n\n

But when it comes to materiali di interfaccia termica<\/strong>, the decision is often reduced to one sentence:<\/p>\n\n\n\n

\u201cJust make sure the thermal conductivity is high enough.\u201d<\/p>\n\n\n\n

This mindset may have been acceptable a few years ago. But after 2025, the situation has changed completely.<\/p>\n\n\n\n

In AI servers<\/strong>, single-chip power has climbed from 300W<\/strong> to more than 1000W<\/strong>.
In energy storage systems, cycle life expectations have extended from 10 years<\/strong> to 15 years or even longer<\/strong>.
In new energy vehicles, the integration level of electronic control systems keeps rising.<\/p>\n\n\n\n

In these applications, materiali di interfaccia termica<\/strong> are no longer just gap-filling accessories. They directly affect the efficiency of the entire thermal management path, long-term reliability, and total system cost.<\/p>\n\n\n\n

Many people in the industry ask me why more engineers are moving away from \u201cthermal conductivity worship.\u201d<\/p>\n\n\n\n

The answer is simple:<\/p>\n\n\n\n

Because real engineering experience has already proved that thermal conductivity is only one selection factor \u2014 and in many cases, it is not even the most important one.<\/p>\n\n\n\n

\"One<\/div>\n\n\n\n

From \u201cGap Filling\u201d to \u201cTemperature Control\u201d: The Role of Thermal Materials Is Being Upgraded<\/h2>\n\n\n\n

In the past, the main job of thermal materials was to fill interface gaps and reduce contact thermal resistance.<\/strong> As long as the thermal conductivity looked high enough, many people assumed the problem was solved.<\/p>\n\n\n\n

But in high-power-density applications, the role of thermal materials has changed. They are no longer passive \u201cgap fillers.\u201d They are becoming active thermal management executors.<\/p>\n\n\n\n

Take AI servers<\/strong> as an example.<\/a><\/p>\n\n\n\n

GPU chips generate extremely high heat flux. The hotspot temperature can often be more than 10\u00b0C higher<\/strong> than the average temperature. If engineers only focus on the nominal thermal conductivity of a material while ignoring interface wetting, compressibility, and long-term stability, they may end up with an embarrassing result:<\/p>\n\n\n\n

High thermal conductivity on paper, but high contact thermal resistance in the real system.<\/strong><\/p>\n\n\n\n

In actual engineering projects, the selection between thermal gel <\/a>e thermal silicone pads <\/a>often requires a combined evaluation of interface pressure, component tolerance, and automation process requirements.<\/p>\n\n\n\n

For example, in an energy storage battery pack, the gap between battery cells and the cooling plate may vary by 1\u20132 mm<\/strong> due to assembly tolerances. In this situation, thermal gel shows its advantage. It can be precisely dispensed through automated equipment, fill the interface effectively, and maintain low stress \u2014 helping avoid excessive pressure on the battery cells.<\/p>\n\n\n\n

This role upgrade, from \u201cgap filling\u201d to \u201ctemperature control,\u201d means that thermal material suppliers are no longer just accessory vendors.<\/p>\n\n\n\n

They are becoming key participants in thermal management solutions.<\/p>\n\n\n\n

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\"One<\/div>\n<\/div>\n <\/div><\/div>\n\n\n\n

Why \u201cHigh Thermal Conductivity\u201d Does Not Always Mean \u201cBetter Heat Dissipation\u201d<\/h2>\n\n\n\n

This is an old topic, but it deserves to be repeated again and again.<\/p>\n\n\n\n

When many engineers select materiali di interfaccia termica<\/strong>, their first reaction is to compare thermal conductivity.<\/p>\n\n\n\n

A material rated at 13 W\/m\u00b7K<\/strong> must be better than one rated at 8 W\/m\u00b7K<\/strong>, right?<\/p>\n\n\n\n

Not necessarily.<\/p>\n\n\n\n

Thermal conductivity reflects the heat transfer capability of the material itself. But the actual heat dissipation result depends on the total thermal resistance of the entire thermal management path.<\/p>\n\n\n\n

This total thermal resistance includes:<\/p>\n\n\n\n