Ohara Corporation

Ohara Corporation is the international-facing corporate identity associated with Ohara Inc., a Japanese glass manufacturer founded in 1935 and headquartered in Sagamihara, Kanagawa. The company operates within the Ohara Group and supplies specialized glass and related materials for optical, scientific, industrial, astronomical, and precision-engineering applications. Its activities extend beyond conventional commercial glassmaking: the portfolio includes optical glass, polished substrates, fused silica and quartz, infrared materials, optical crystals, low-expansion glass, glass ceramics, and measurement services. Ohara is particularly recognized in the optics sector as a catalog supplier of optical glasses used by lens designers and manufacturers. Its catalog contains more than 130 glasses described as environmentally safer formulations produced without lead and arsenic. Materials are offered in forms such as strips, slabs, cut blanks, and pressings, allowing customers to select stock suitable for lens production, scientific instruments, imaging systems, and other precision optical assemblies. The company’s optical-glass range includes low-dispersion materials such as FPL51 and FPL53, which are used where chromatic-aberration control is important, as well as E6 borosilicate glass and ClearCeram-Z glass-ceramic material. The company also participates in large-scale scientific infrastructure through the supply of mirror materials. Its E6 borosilicate glass was used for large astronomical mirror projects, including the Large Synoptic Survey Telescope, the Giant Magellan Telescope, and the Large Binocular Telescope. These applications illustrate Ohara’s role as a materials supplier for observatories and other demanding systems in which homogeneity, thermal behavior, optical quality, and dimensional stability are critical. Ohara’s business is international in reach, with subsidiaries and operations associated with Japan, the United States, Germany, Hong Kong, Malaysia, Taiwan, and China. In the United States, Ohara Corporation functions as the U.S. subsidiary of the wider Ohara Group. The company’s market position is based on specialized materials expertise rather than consumer branding: customers generally encounter Ohara through technical catalogs, material specifications, engineering support, and supply relationships. Its products serve professional users in optics, astronomy, semiconductor-related applications, scientific instrumentation, and precision manufacturing. Publicly available reference material identifies Ohara as an active global glass company but provides limited information about its ownership structure, executive leadership, financial performance, marketing campaigns, and corporate transactions. Accordingly, this dossier emphasizes documented products, technical applications, geographic presence, and historical milestones while leaving unsupported corporate details unfilled.

Ohara began manufacturing glass in Japan in 1935. From its origins as a specialist glass producer, the company developed capabilities in optical and other high-performance materials, eventually serving industries where glass must meet demanding requirements for transmission, dispersion, thermal stability, homogeneity, and surface quality. Its growth reflects the broader expansion of precision optics, scientific instrumentation, imaging, astronomy, and advanced manufacturing. A central part of Ohara’s history is the development and commercialization of optical-glass materials. Optical glass is not sold only as a generic transparent material; it is engineered to provide controlled refractive and dispersion properties for lens designers. Ohara’s catalog became a reference source for designers selecting stock glasses for photographic lenses, microscopes, telescopes, measurement devices, and other optical systems. The catalog includes a broad range of formulations, including environmentally safer glasses made without lead and arsenic, and materials supplied in multiple production forms such as strips, slabs, blanks, and pressings. The company expanded its technical scope beyond conventional optical glass into fused silica, quartz, infrared-transmitting materials, optical crystals, low-expansion glass, glass ceramics, polished substrates, and measurement services. These categories address applications in which optical behavior, thermal expansion, chemical performance, surface finish, or dimensional consistency are important. ClearCeram-Z, for example, belongs to the company’s glass-ceramic and low-expansion technology portfolio, while E6 is a borosilicate material associated with high-quality optical and astronomical mirror applications. FPL51 and FPL53 are low-dispersion glasses used in lens designs requiring strong control of chromatic aberration. Ohara’s materials have also been used in major astronomical telescope projects. More than 23.5 tons of E6 borosilicate glass were supplied for mirror blanks associated with the Large Synoptic Survey Telescope. E6 was also used in mirrors for the Giant Magellan Telescope and the Large Binocular Telescope, whose primary mirrors are approximately 8.4 meters wide. These projects demonstrate the scale and precision of the company’s materials business: the glass is incorporated into mirror blanks that must remain stable during fabrication and operation while meeting demanding optical specifications. Over time, Ohara established an international operating network. Reference material identifies subsidiaries or group operations in the United States, Germany, Hong Kong, Malaysia, Taiwan, and China, in addition to Japan. Ohara Corporation is specifically identified as the U.S. subsidiary of the Ohara Group. This network supports the company’s relationships with international optical manufacturers, scientific institutions, engineering companies, and industrial customers. The available reference material does not document specific founders, chief executives, public financial results, major acquisitions, advertising campaigns, scandals, or formal corporate rebranding events. The company’s documented historical significance instead lies in the long-term development of specialized glass technologies and their use in optical systems and large scientific instruments.

• 1935

  Company founded and glass production begins

  [1]Ohara Corporationen.wikipedia.org

  Ohara was founded in Japan and began manufacturing glass, establishing the basis for its later specialization in optical and precision materials.

• Expansion into international operations

  [1]Ohara Corporationen.wikipedia.org

  Ohara developed subsidiaries and operating organizations in markets including the United States, Germany, Hong Kong, Malaysia, Taiwan, and China. The U.S. business is identified as Ohara Corporation, a subsidiary of the Ohara Group.

• Supply of glass for major astronomical mirrors

  [1]Ohara Corporationen.wikipedia.org

  Ohara supplied E6 borosilicate glass for mirror projects associated with the Large Synoptic Survey Telescope, the Giant Magellan Telescope, and the Large Binocular Telescope.

A specialist supplier of high-quality optical and precision glass materials for professional, scientific, industrial, and astronomical applications.

• Optical materials

  Optical glass

  Ohara’s optical-glass portfolio is designed for lens and imaging-system applications. Its catalog contains more than 130 formulations, including glasses made without lead and arsenic. Materials are supplied in formats such as strips, slabs, cut blanks, and pressings, supporting lens production and other precision-optics manufacturing. The range includes different refractive-index and dispersion characteristics so designers can select materials for photographic, scientific, industrial, and astronomical systems.

• Borosilicate optical glass

  E6 borosilicate glass

  E6 is a high-purity borosilicate glass associated with demanding optical and astronomical applications. Ohara supplied more than 23.5 tons for mirror blanks connected with the Large Synoptic Survey Telescope and also supplied material used in mirrors for the Giant Magellan Telescope and the Large Binocular Telescope. Its use in these projects reflects requirements for optical quality and stability in very large mirror structures.

• Glass ceramic

  ClearCeram-Z

  ClearCeram-Z is a low-expansion glass-ceramic material in Ohara’s precision-materials portfolio. It is intended for applications where dimensional stability and controlled thermal expansion are important. The material is associated with the same broad class of use cases as other specialized low-expansion glass ceramics, including precision optical and scientific equipment.

• Low-dispersion optical glass

  FPL51

  FPL51 is a low-dispersion optical glass used in lens design to reduce chromatic aberration. Its optical characteristics make it relevant to advanced imaging systems and other optical assemblies that require carefully balanced dispersion and refractive properties.

• Low-dispersion optical glass

  FPL53

  FPL53 is a low-dispersion optical glass with properties described as approaching those of fluorite. It is used by optical designers where strong control of chromatic aberration is needed, particularly in high-performance lens systems.

• Silica materials

  Fused silica and quartz

  Ohara lists fused silica and quartz among its specialized material categories. These materials serve precision applications that may require optical transmission, thermal resistance, purity, or controlled material performance.

• Specialty optical materials

  Infrared materials and optical crystals

  The company’s infrared-material and optical-crystal offerings address optical systems operating outside the visible spectrum or requiring specialized crystal properties. The reference material identifies these as core areas of specialization but does not provide a complete product catalog.

• Precision substrates

  Polished substrates

  Polished substrates are precision-finished glass or related material components supplied for applications requiring controlled flatness, surface quality, and dimensional accuracy. Specific substrate compositions and end markets are not detailed in the available reference.

• Technical services

  Measurement services

  Measurement services complement Ohara’s materials business by supporting the characterization and quality assessment of optical and precision-glass products. The available reference identifies the service area but does not specify its full scope or instrumentation.

1. 1Ohara Corporationen.wikipedia.org