Glass Substrates Are Breaking Through the AI Chip Packaging Bottleneck

Intel's No SeWaRe Result Signals Mass Production One Step Closer. Plus Key Players and Supply Chain Opportunities

The AI infrastructure buildout is often discussed in terms of chips and computing power. But beneath the surface, a set of supply chain bottlenecks is quietly shaping the pace and cost of deployment. Last week, we looked at glass fiber cloth. This week: glass substrates.

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As AI chips grow more complex, package sizes keep expanding, and traditional organic substrates are reaching their limits. Under high temperatures during assembly, warpage reduces yield and becomes increasingly difficult to manage as package sizes grow.

Against this backdrop, glass, with better thermal and mechanical properties, is emerging as the next-generation material for advanced packaging. Glass-based solutions fall into two categories: one replaces the core layer of the substrate with glass, known as a glass core substrate; the other replaces the silicon interposer with glass, known as a glass interposer.

Intel has been an active mover in glass substrate technology. As early as 2023, Intel committed to glass substrates in its advanced packaging roadmap. In January 2026, it debuted the first sample combining EMIB packaging with a glass core substrate at NEPCON Japan — achieving No SeWaRe, or no micro-cracks — marking a decisive step toward commercial reality.

Meanwhile, Samsung and Rapidus are expected to roll out glass interposer solutions, while SK Absolics is targeting mass production of glass substrates in 2026.

This article covers the technical advantages of glass substrates, the manufacturing challenges that remain, and how the supplier landscape is taking shape.