Proterial Co., Ltd. (OTCMKTS: HMTLY) is a Japan-based manufacturer specializing in advanced materials and metal processing solutions. Established through the reorganization of material operations within the Sumitomo Metal Mining Group, the company was rebranded as Proterial in 2016. Headquartered in Tokyo, it leverages decades of metallurgical expertise to serve customers in high-growth industries worldwide.
The company’s product portfolio spans copper and copper alloy foils, semiconductor lead frames, sputtering target materials, fine ceramics, graphite electrodes, and high-purity metal powders. Proterial combines precision metal forming, surface treatment, and coating technologies to deliver customized components for electronics, automotive, semiconductor, telecommunications, and energy applications. Key offerings include ultra-thin rolled copper foil for printed circuit boards, nickel and copper alloy foils for lithium-ion batteries, and specialty graphite products for industrial furnaces and electrochemical cells.
Proterial maintains a global footprint with production facilities and sales offices across Japan, China, South Korea, Malaysia, Europe, and North America. Its research and development centers focus on next-generation materials that support miniaturization, higher performance, and environmental sustainability. Through strategic partnerships and a commitment to quality management, Proterial aims to address evolving customer requirements and reinforce its position as a leading supplier of advanced industrial materials.
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