AI packaging turns to glass, with TGV metallisation persisting as key technical hurdle

The adoption of glass substrates in AI packaging is gaining momentum, yet supply constraints on low thermal expansion coefficient fiberglass fabrics are already constraining high-end packaging capacity. This material bottleneck directly impacts thermal management and reliability in chip packaging, especially at advanced nodes, where glass brittleness and inconsistent via metallization processes are causing yield losses and delays. From a supply chain perspective, Taiwan, China firms hold a technological edge but face prolonged validation cycles and high capital expenditure risks. Failure to resolve metallization consistency issues may force packaging vendors to revert to ceramic substrates or seek alternatives, undermining their competitiveness in AI chip markets. Global semiconductor players are accelerating alternative R&D efforts, such as Japanese and South Korean firms investing in glass substrate materials to reduce supply concentration risks. Over the next 12-24 months, if Taiwan, China fails to stabilize key material supply, global AI packaging capacity misalignment could emerge, pushing the industry toward diversified and heterogeneous sourcing strategies.