# Chip-level thermal: lids, heat spreaders, TIMs

Part ID: 1.17 · Layer 1 (Compute silicon & packaging)

The metal lids, heat spreaders, and thermal interface materials applied directly at the die level to move heat off an accelerator package before it ever reaches a cold plate or heat sink.

This is the first step of thermal management in the entire catalog, applied before the part sits on a board at all: a lid or heat spreader bonded over the die, with a thermal interface material filling the gap between them, moving heat from the silicon itself out to whatever cooling hardware the server uses next — a cold plate for liquid-cooled designs or a heat sink and fan for air-cooled ones (Layer 5, Layer 6). It sits directly downstream of advanced packaging, since the lid is typically part of the finished package rather than added later on the server line.
As accelerator power density rises, the performance bar on both the lid material and the thermal interface material rises with it — an interface material that was adequate for a lower-power chip generation can become a limiting factor for a hotter one. For investors, this is a smaller, more specialized materials position than packaging or substrates, with a mix of dedicated thermal materials suppliers and larger diversified chemicals and materials companies, where qualification is tied tightly to a specific chip generation's thermal design rather than being a general-purpose materials sale.

**AI delta:** Rising AI accelerator power density raises the performance bar on die-level lids, heat spreaders, and thermal interface materials generation over generation.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Dow | manufacturer | inferred | public | DOW |  |
| Henkel | manufacturer | inferred | public | HEN.DE |  |
| Honeywell | manufacturer | inferred | public | HON |  |
| Jentech | manufacturer | inferred | public | 3653.TW | lids and heat spreaders |
| Laird | manufacturer | inferred | subsidiary |  |  |
| Shin-Etsu | manufacturer | inferred | public | 4063.T |  |
| Boyd | manufacturer | inferred | private |  |  |
| Fujipoly | manufacturer | inferred | private |  |  |
| Indium | manufacturer | inferred | private |  | indium TIMs |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.