


The strangest AI bottleneck might be ABF. Ajinomoto is better known for MSG, but its build-up film (ABF) is a critical dielectric layer inside the package substrates used for high-end GPUs. the moat isn't chemical secrecy alone.. it is qualification lock-in + process integration + reliability history. and the fact that no chip company wants to risk a $30,000 AI accelerator package to save pennies on dielectric film. is it a permanent monopoly? Probably not. but it looks cycle-durable. if you ask me: - 1-3 yrs: very hard to replace in high-end AI substrates - 3-5 yrs: glass substrates and alternatives gain in specific packages - 5+ yrs: package architectures probably shift To see this, i'm tracking closely whether Nvidia, AMD, Broadcom, TSMC, Ibiden, Shinko and Unimicron show signals for moving away from ABF.





















