Seiwa Sangyo Co., Ltd. is a company engaged in the sales and import/export of components and parts made from synthetic crystal materials (such as sapphire, ruby, YAG), optical glass components, precision ceramic components, and metal material parts.

Our company's products mainly include five series, Synthetic Crystal Components & Parts (materials including sapphire, ruby, YAG, germanium, silicon, and other crystalline materials), Optical Glass Components & Parts (materials such as BK7, fused silica and quartz glass), Precision Ceramic Components (zirconia and alumina ceramics), Metal Components (stainless steel, aluminum, steel, brass, etc.) and Trade Agency Services for Japanese and Chinese products.

Based on domestic marketing, the company has actively expanded into international markets and diversified applications. In recent years, sapphire optical windows with high technical content and cost-effectiveness, jewel optical components for special purposes，zirconia/aluminum ceramic components, non-metallic brittle materials and superhard material products are participating in the international market competition, the market share is increasing year by year, and the products are steadily exported to many developed countries and regions in Asia, North America and Europe, and are widely used in machinery Chemicals, electronics, semiconductors, optics, laser technology, optical fiber communications, textiles, medicine, aviation and many other high-tech fields.