Seishin Plastic

Seishin Plastic Co., Ltd. is a Japanese manufacturer specializing in high-precision plastic injection molding for the medical, pharmaceutical, and laboratory sectors. Established in 1971 and headquartered in Kawaguchi, Saitama, the company operates sophisticated cleanroom facilities (Class 10,000 and 100,000) to ensure the sterility and quality of its products. Their portfolio includes medical device components, diagnostic containers, and specialized laboratory consumables such as petri dishes and test tubes. Seishin Plastic provides comprehensive services from mold design and development to mass production and assembly. The company is ISO 9001 and ISO 13485 certified, positioning it as a reliable partner for healthcare and life science organizations requiring high-quality plastic solutions.