Discussion of advanced packaging tends to gather around CoWoS and HBM, but the package substrate that carries them is a hidden linchpin of supply. The more you pack a compute die and HBM into one package, the more the substrate must offer high wiring density, flatness, and thermal/mechanical stability. And now the mainstream organic substrate (ABF-based) is nearing its scaling limit, making glass substrates the realistic next move.
Leading this domain is a lineup different from the usual centers of memory and foundry — the U.S.'s Intel and Korea's SKC (its subsidiary Absolics). Without over-weighting any single country, it is worth mapping the next-gen substrate through primary sources.
Why organic substrates fall short
Organic substrates are projected to reach their scaling limit by the end of this decade. The more you try to integrate many chiplets at higher density, the more the substrate's wiring density and flatness become constraints. Here, glass substrates offer ultra-low flatness and superior thermal/mechanical stability versus organic substrates, greatly raising interconnect density.
The advantage is not density alone. Adopting glass substrates enables multi-chiplet integration in a smaller footprint while lowering cost and power consumption. In ever-larger AI packages, substrate warpage and thermal deformation directly govern yield and reliability. Glass's dimensional stability is an answer to this physical wall.
Intel — leading after a decade of research
Intel unveiled glass substrates, touting industry-leading technology for next-generation advanced packaging toward the 2030s. This is not an overnight entry. After a decade of research, Intel leads the industry in glass substrates and eyes offering the technology to foundry customers. It is part of a vertical integration that offers customers not just the front end but assembly and substrates too. Glass is positioned as a foundational material in Intel's strategy of "scaling performance through packaging."
SKC/Absolics — world-first volume in Georgia
Going a step beyond a technology announcement is Absolics, a subsidiary of Korea's SKC. SKC completed the world's first glass-substrate volume-production facility in Georgia, USA. What matters is that it actually stood up a volume line, not merely reached the research stage. SKC's glass substrate improves data-processing speed by 40% versus conventional substrates.
There is backing in location and capital. It secured $75 million in production subsidies and is advancing glass-substrate volume production within the U.S. Glass substrates substantially cut the physical footprint and energy consumption of AI data centers — a pitch that ties directly to AI demand. U.S.-based volume production is also notable for not concentrating next-gen substrate supply in a single region.
Reading the next-gen substrate
Glass substrates: Intel and SKC/Absolics
01
Why glass
Organic substrates hit their limit late this decade. Glass raises interconnect density with ultra-low flatness and thermal/mechanical stability, enabling multi-chiplet integration and lower cost/power.
02
Intel (US)
Leads glass substrates after a decade of research, toward 2030s next-gen packaging. Eyes offering it to foundry customers, pursuing vertical integration from assembly to substrate.
03
SKC/Absolics (Korea, US volume)
Completed the world's first volume facility in Georgia, USA. 40% faster than conventional, $75M subsidy. Led with volume, not just research.
04
Implication for buyers
The next-gen substrate is US–Korea-led. As AI packages grow, the substrate becomes key to yield and supply. Adoption timing and volume-ramp track record are the evaluation axes.
Business impact and checkpoints
From a procurement and investment view: (1) whether the AI packages you touch are nearing the density/flatness limits of organic substrates; (2) how to get through the tightness of organic/ABF substrates until glass adoption ramps (full ramp in the 2030s); and (3) which of Intel (technology) and SKC/Absolics (volume) first builds a real supply track record, and where supply geography diversifies. The substrate is inconspicuous, but in ever-larger AI packages it is a linchpin that determines yield and supply continuity — worth tracking the transition to the next generation early.
