Schroder Spezialglas GmbH products

MACOR is a glass ceramic that can be machined with cemented carbide or diamond tools. It consists of a glass matrix containing mica crystals. Its outstanding machinability makes a wide range of precision parts with complex shapes possible.

Shapal Hi Msoft is a new kind of machinable ceramic. The material combines high thermal conductivity with high mechanical strength.

Zerodur® is a glass ceramic featuring extremely low expansion on exposure to changing temperature. The material is relatively hard and should be treated with a special polish. Zerodur, a registered trademark of Schott AG, is a glass ceramic. Used in large, professional telescopes, it is the material of choice for mirrors. What makes Zerodur® special is that it features extremely low expansion on exposure to changing temperature. The material is relatively hard and should be treated with a special polish. Zerodur® has to be handled gently as far as cementing is concerned – at temperatures above 100 °C, it loses its zero expansion.

Borosilicate glass (Boronorm) is a colourless glass with good thermal and chemical properties and outstanding transparency.

Gorilla® glass is a thin and highly scratch-resistant glass in a thickness of 0.4 – 2 mm. Gorilla® glass from Corning is an alkali-aluminosilicate glass. Thanks to its substrate composition, a very high depth of layer (DOL) can be achieved through chemical toughening, making Gorilla® glass extremely scratch- and crack-resistant as well as flexible. Gorilla® glass is mainly used as cover glass for smartphones and tablet computers. Basically, however, this glass is used in all areas demanding a combination of glass and high scratch and crack resistance. Another property of Gorilla® glass is its high optical quality. This is attributable to the down-draw production process yielding high surface quality with minimal thickness tolerance.

Finished products made of block material. As one of the most valuable materials for industrial applications, natural quartz glass has a number of unique properties. It has a nominal purity > 99.99 weight per cent SiO2. Quartz glass has high temperature stability as well as displaying outstanding transmittance values in the UV and IR ranges.

Plates of natural quartz glass are produced from tubes. In this process, the tubes are cut open and, on exposure to heat, worked into plates. The resultant slightly wavy surface is then fire-polished.

Finished products made of synthetic material. Synthetic quartz glass consists of amorphous silicon dioxide and is produced by flame hydrolysis. This non-crystalline and transparent material is particularly suitable for optical applications in the visible wavelength range and displays unchanging quality.

Optical colour filters are made of coloured glass and are essential components for the transmission or blocking of certain spectral ranges. Glass filters are suitable as substrates for thin-film coating, e.g. in the production of interference filters. To achieve the best-possible filter solution and enhance the effect, different glass filters are often also combined.

In its typical composition, borosilicate float glass (Boronorm) contains fewer colour-imparting iron oxides. This makes it a colourless glass with good thermal properties and outstanding transparency. Thanks to the low thermal expansion typical of this borosilicate, tempering yields a glass with exceptionally high thermal shock resistance.