Taiwan's Elite Material fell sharply toward its daily limit on a market rumor about Nvidia's next-generation chips, and industry sources say the fear is overdone.

• Traders sold on talk that Nvidia's coming Rubin Ultra platform would use a PTFE-based material that skips copper-clad laminate.
• Elite Material, the world's biggest maker of that laminate, dropped hard even as Taiwan's stock index hit a new high.
• Industry people say the PTFE solution still needs Elite Material's top-grade material and is only a stopgap.
• PTFE would not replace glass fabric outright — it mainly cuts signal loss in high-speed layers — and it is hard to drill and short on pressing capacity.
• Trading volume jumped well above the previous full day's total, a sign the selling was panic rather than fundamentals.

Outlook: Mass production of the PTFE approach remains highly uncertain, so the selloff looks more like a rumor-driven shakeout than a lasting change to Elite Material's business.