Ceran

Ceran is a glass-ceramic material brand developed and manufactured by the German specialty-glass company Schott AG. The material is based on lithium aluminosilicate glass-ceramic and is primarily used as the cooking surface in electric, induction, and gas cooktops. Its combination of a smooth glass-like appearance, low thermal expansion, resistance to thermal shock, and mechanical strength made it an important alternative to traditional electric stoves with exposed or enclosed cast-iron heating plates. The technology grew out of Schott’s earlier work on Zerodur, a glass-ceramic developed in the late 1960s for precision telescope-mirror substrates in cooperation with the Max Planck Institute for Astronomy. Zerodur demonstrated the usefulness of glass-ceramics with extremely low thermal expansion. Schott subsequently investigated household-appliance applications, where the ability to tolerate rapid temperature changes was particularly valuable. In cooperation with the German appliance manufacturer Imperial, which later became part of Miele, Schott developed the first black glass-ceramic cooktop surface. A prototype appeared in 1971, and serial production followed in 1973. Ceran initially gained traction in Germany and later became a major European cooktop-surface brand. Within Germany, the brand name became so closely associated with glass-ceramic cooking surfaces that it came to be used colloquially as a generic term, although that usage is technically broader than the Ceran trademark and product identity. The term has also been included in the Duden German dictionary. The brand’s growth was supported by the material’s ability to transfer heat from an underlying heating element to cookware while leaving much of the surrounding surface comparatively cooler than conventional solid hotplates. Schott reported rapid adoption during the first years of production. Approximately 7,000 Ceran cooktops were sold during the first two years of serial manufacturing, and one million units had been produced by 1980. By 1995, Ceran reportedly held about 95 percent of the German glass-ceramic cooktop market and approximately 90 percent of the European market, with sales in roughly 30 countries. Production continued to expand internationally: the 100-millionth cooktop was reached by 2010, the 200-millionth by 2021, and the brand was available in more than 140 countries by that time. Ceran is not an appliance maker in the usual sense. It is a component and material brand whose panels are incorporated into cooktops produced by appliance manufacturers. Its value proposition therefore rests on material performance, design flexibility, compatibility with different heating technologies, and manufacturing quality rather than on direct-to-consumer appliance features. Panels are typically cut, edge-finished, drilled, decorated, and integrated into finished cooktops according to appliance-makers’ requirements. The manufacturing process begins by melting raw materials from the lithium aluminosilicate system at approximately 1,600 degrees Celsius. The molten glass is formed into sheets of generally around 4–5 millimetres in thickness and cooled under controlled conditions. After cutting and surface processing, the sheets are reheated to approximately 900 degrees Celsius to induce controlled partial crystallization. This transforms the original glass into a glass-ceramic with the required balance of appearance, thermal stability, and strength. The resulting surface can tolerate temperature fluctuations of up to approximately 700 degrees Celsius and is suitable for electric, induction, and gas cooking applications. Schott has also positioned Ceran around environmental and process improvements. Since 2009, the company has described its production as avoiding toxic heavy metals such as arsenic and antimony. In 2025, Schott completed a pilot project involving the recycling of 50 tons of glass-ceramic cooktops from multiple manufacturers. The project indicates an effort to address end-of-life material recovery in a product category historically designed around long service life and integration into larger appliances.

Ceran’s origins lie in Schott AG’s work on advanced glass-ceramic materials during the 1960s. Schott had developed Zerodur for highly stable telescope-mirror substrates in cooperation with the Max Planck Institute for Astronomy. The material’s very low thermal expansion suggested applications beyond scientific instruments, including surfaces exposed to the repeated heating and cooling cycles found in domestic cooking appliances. Schott began adapting the technology for household use and worked with Imperial, a German appliance manufacturer later associated with Miele, on a black glass-ceramic cooktop surface. The prototype was introduced in 1971. Serial manufacturing began in 1973, establishing Ceran as a branded material rather than as a complete cooking-appliance line. During the first two years of serial production, approximately 7,000 Ceran cooktops were sold. The initial market was Germany, where consumers and appliance manufacturers adopted the material as an alternative to conventional electric cooking surfaces. Ceran allowed heating elements to sit below a continuous, smooth panel. Heat could pass to cookware while the surrounding surface generally remained cooler than the active cooking zone. The panel also supported a modern, integrated kitchen appearance and was easier to clean than many traditional designs. By 1980, Schott had produced one million Ceran cooktops. The brand subsequently expanded throughout Europe and into other international markets. By 1995, it reportedly held approximately 95 percent of the German glass-ceramic cooktop market and around 90 percent of the European market. It was being sold in about 30 countries at that time. In Germany, the commercial success of the brand caused “Ceran” to become a common informal term for glass-ceramic cooktops generally, even though not every such surface is a Ceran product. The word’s inclusion in the Duden dictionary reflects this broader cultural visibility rather than a change in the technical scope of the brand. Ceran’s material is produced from a lithium aluminosilicate glass system. Raw materials are melted at approximately 1,600 degrees Celsius, formed into sheets of roughly 4–5 millimetres, and cooled in a controlled manner. The sheets are then cut, trimmed, edge-finished, drilled where required for controls or fittings, and decorated with printed markings. A final reheating stage at about 900 degrees Celsius induces partial crystallization, giving the material its glass-ceramic structure. This processing provides a combination of smooth appearance, low thermal expansion, thermal-shock resistance, and mechanical durability. The brand’s scale continued to grow over subsequent decades. Schott reached 100 million produced cooktops by 2010 and 200 million by 2021. By 2021, Ceran products had reached more than 140 countries. The brand remained primarily a business-to-business material and component offering, supplied for integration into cooktops made by appliance companies rather than sold mainly as a standalone consumer product. Environmental characteristics became a more visible part of the product story. Since 2009, Schott has stated that it was the first producer in the industry to manufacture glass-ceramic cooktops without toxic heavy metals such as arsenic and antimony. In 2025, it completed a pilot project recycling 50 tons of glass-ceramic cooktops sourced from different manufacturers. This initiative addressed the recovery and reuse of material at the end of the cooktops’ useful lives and suggested a possible future direction for the brand’s manufacturing and sustainability strategy.

• 2025

  Glass-ceramic recycling pilot completed

  [1]Ceranen.wikipedia.org

  Schott completed a pilot project recycling 50 tons of glass-ceramic cooktops from multiple manufacturers.

• 2021

  200 millionth cooktop produced

  [1]Ceranen.wikipedia.org

  Schott reported production of the 200 millionth Ceran cooktop, with the brand available in more than 140 countries.

• 2010

  100 millionth cooktop produced

  [1]Ceranen.wikipedia.org

  Cumulative Ceran cooktop production reached 100 million units.

• 2009

  Heavy-metal-free production milestone

  [1]Ceranen.wikipedia.org

  Schott stated that Ceran production became the first in its industry to avoid toxic heavy metals including arsenic and antimony.

• 1995

  Strong German and European market position

  [1]Ceranen.wikipedia.org

  Ceran reportedly held about 95 percent of the German glass-ceramic cooktop market and about 90 percent of the European market, with sales in approximately 30 countries.

• 1980

  One million cooktops produced

  [1]Ceranen.wikipedia.org

  Schott reached cumulative production of one million Ceran cooktops.

• 1973

  Serial production begins

  [1]Ceranen.wikipedia.org

  Ceran entered serial production for household cooktops. Approximately 7,000 units were sold during the first two years.

• 1971

  First Ceran cooktop prototype introduced

  [1]Ceranen.wikipedia.org

  Schott and appliance manufacturer Imperial introduced an early black glass-ceramic cooktop prototype based on Schott’s prior glass-ceramic research.

A premium, technically differentiated glass-ceramic surface brand emphasizing thermal-shock resistance, mechanical strength, clean design, and compatibility with electric, induction, and gas cooking systems.

• Cooktop component material · 1971

  Ceran glass-ceramic cooktop surfaces

  Ceran panels are lithium aluminosilicate glass-ceramic surfaces integrated into electric, induction, and gas cooktops. They retain the smooth, visually continuous appearance of glass while offering the low thermal expansion, thermal-shock resistance, and mechanical strength needed for repeated cooking cycles. Panels can be cut, beveled, drilled, printed, and configured for different appliance designs. The material is used primarily by appliance manufacturers rather than sold as a complete standalone cooking appliance.

• 2025

  Pilot recycling of glass-ceramic cooktopsStrategy

  Background

  Cooktop glass-ceramic is a durable material, but its recovery at the end of an appliance’s life presents a recycling challenge. Schott tested a recovery process using cooktops from different manufacturers.

  Action taken

  The company completed a pilot involving the recycling of 50 tons of glass-ceramic cooktops.

  Aftermath

  The pilot provided a basis for evaluating wider end-of-life recovery and recycling approaches for Ceran-type cooktop materials. No broader commercial rollout is specified in the available material.

  Source

1. 1Ceranen.wikipedia.org