Samsung Electro-Mechanics and Sumitomo Chemical Form Joint Venture for Glass Substrate Production
0xBroomberg
Samsung Electro-Mechanics and a Sumitomo Chemical subsidiary are forming GlaSSEM, a ₩482.1 billion joint venture to mass-produce glass-core substrates for next-generation chip packaging — the first large-scale industrial bet on replacing plastic substrates with glass.
What exactly will this joint venture do?
GlaSSEM will produce glass cores — the central material layer inside glass substrates used for chip packaging — with registered capital of ₩482.1 billion.
Samsung Electro-Mechanics holds 66%; Dongwoo Fine-Chem (東友精細化工), Sumitomo Chemical's Korean subsidiary, holds 34%. Headquarters and production sit at Dongwoo's existing plant in Pyeongtaek, Gyeonggi Province.
The company targets formal establishment in 2026 (pending regulatory approval) and a supply system by H2 2027, with capacity scaling up afterward.
Why switch from plastic substrates to glass?
Today's chip packaging substrates are mostly plastic-organic. As AI chips grow larger and denser, plastic is hitting its limits — it warps more easily, expands too much with heat, and struggles to hold dimensional stability.
Glass-core substrates offer higher rigidity, less warpage, and a lower thermal expansion coefficient, supporting larger and denser packages.
This means → whoever reaches production-grade glass substrates first secures the entry ticket to next-generation AI chip packaging.
What does each partner bring to the table?
Dongwoo Fine-Chem specializes in thin-glass processing — large-area glass automation equipment, cleanroom controls, and end-to-end manufacturing know-how from development to mass production.
Samsung Electro-Mechanics contributes substrate design and fabrication — high-layer-count, high-density wiring, large-format packaging, plus quality and reliability credentials from AI server applications.
In plain terms = one partner knows how to handle glass; the other knows how to put circuits on it. Together they can move glass substrates from the lab to the factory floor.
How long did the deal take to close?
The two sides signed a memorandum of understanding in Tokyo on November 5, 2025, already designating Samsung Electro-Mechanics as the majority shareholder with headquarters in Pyeongtaek.
The definitive agreement followed on July 2, 2026 — roughly eight months later — locking in equity splits, capital, and a production timeline.
Samsung Electro-Mechanics president Chang Deok-hyun said the goal is to "establish glass-core competitiveness ahead of the market." Sumitomo Chemical chairman Keiichi Iwata framed it as strengthening long-term collaboration in advanced semiconductor materials.
What does this mean for the industry?
Glass substrates remain at the sample and pilot-line stage globally. No large-scale mass production exists yet — though Samsung Electro-Mechanics has already produced prototype glass packaging substrates on its pilot line in Sejong.
This means → whether GlaSSEM can deliver on schedule in H2 2027 will be the key test of whether glass substrates can move from lab concept to production reality.
This reflects a broader shift: driven by generative-AI demand and data-center investment, the substrate-material race has moved from "should we switch?" to "who switches first?"
Content is for reference only, not financial advice.