Tongguan Copper Foil has announced that its self-developed high-frequency, high-speed copper foil products are now in mass production, though they currently represent a small portion of overall shipments. The company anticipates these specialized copper foils will constitute over 20% of their total shipments by 2025. Separately, Hesun Technology's subsidiary has successfully trial-produced HM46J grade carbon fiber, meeting international advanced standards and achieving mass production capability. AI
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RANK_REASON This cluster contains multiple unrelated news items from a digest-style publication, with no single dominant AI-related story.