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S J Electronics makes thermal interface and packaging materials for integrated circuits.
Founded in 2019 and based in Ningbo, China, S J Electronics manufactures packaging materials for integrated circuits, including high-precision indium sheets with thermal conductivity exceeding 80W/(m.k). It serves chip manufacturers in sectors including computing, 5G, and artificial intelligence. In February 2026, it raised undisclosed venture funding from Xinshang Investment, Wisdom Capital, and other investors.
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