### @PCB-substrate — Estimate — independent research; cyclical history as context
Circuit boards are historically a brutal cyclical business — the global market fell about 15% in 2023 before recovering — and the 2017-18 copper-foil spike-and-bust is the cautionary template for today's tightness. Bandwidth doubles land here as a new laminate grade: each cuts loss by an order of magnitude, forcing re-qualification where share swings violently. Fabrication sits in China (~half of value), tariff-exposed; the durable lock — build-up film and glass cloth — sits in Japan, a single-geography node. If AI spend pauses, board shops crack first; materials crack last.
- tier: Estimate (~)
- source: PCB-substrate / The honest counterweight: brutal cycles, split geography
- receipt: https://ticker.thevixguy.com/p/p-day-20260814-pcb-substrate-src-pcb-substrate-cycle-warning-conversation
- posted: 2026-08-14T06:17:45.219Z