Quartz glass

Quartz glass SiO2, also known as silica glass, is a very important material for industry, research and many other areas. Quartz glass, which has a low coefficient of thermal expansion similar to borosilicate glass, is only attacked by a few acids (hydrofluoric acid and phosphoric acid) and, unlike other technical glasses, can withstand high temperatures of up to 1200°C. In addition, quartz glass is highly resistant to thermal shock. Furthermore, quartz glass has a high thermal shock resistance. In the case of quartz glass, we must distinguish between natural quartz glass and synthetic quartz glass. Synthetic quartz glass (fused quartz glass or fused silica) is produced from pure silicon tetrachloride (SiC14) in a flame pyrolysis process. For natural quartz glass, on the other hand, rock crystal is ground into powder and melted using a hydrogen/oxygen flame. Quartz glass has a high temperature resistance, good thermal shock resistance, a low coefficient of thermal expansion and high purity. Quartz glass not only has particularly good chemical resistance, but also good light transmission. Quartz glass is therefore often used in optical applications as it offers excellent optical properties in the ultraviolet, visible, and infrared wavelength range. We often use quartz glass for optical observation of high-temperature applications, e.g. monitoring combustion chambers, but many of our customers also use quartz glass for optical applications.

Natural quartz glass has excellent transmission in the UV range. Synthetic quartz glass (fused silica) is of the highest purity due to the special manufacturing process. This quartz glass has a high purity and few inclusions and is therefore particularly advantageous for optical applications.

We supply quartz glass plates as round, square or oval (tongue-shaped) blanks, as tubes, cylinders or as glass rings.

Technical details


Quartz glass

Dimensional tolerances on request


Operating temperature:

1000°C / 1832 °F (continuous)

Max. operating temperature:

1200 °C / 2192°F (short-term)

Technical properties

Water resistance according to DIN 12111 (ISO 719):

Hydrolysis class 1

Acid resistance according to DIN 12116:

Acid class 1

Alkali resistance according to DIN 52322:

Alkali class 1

Bending tensile strength:

≥ 67 N/mm² / 9718 psi

Request an offer
+49 (0) 2461 91634 00