Glass tubes and rods quartz glass – fused silica tube – fused quartz

Quartz glass (also called fused silica) has the simplest chemical composition. It consists practically only of silicon and oxygen (silicon dioxide) and does not contain any admixtures of soda or calcium oxide, in contrast to the commonly used glass tubes / glass rods. The excellent chemical and physical properties make these special glass tubes particularly interesting for applications with high demands. It is worth mentioning that fused quartz tubes are not hygroscopic and have an outstandingly high thermal resistance, permanently withstanding temperatures of up to 1000 °C, and also possess excellent thermal shock resistance. The background to these remarkable thermal properties is the low coefficient of thermal expansion. In addition, quartz glass is characterized by a very low content of impurities. As a result, quartz glass tubing and fused quartz tubes have a high optical quality and are predestined for a wide range of optical applications.

Contact us

Special properties of quartz glass

Glass tubes and rods made of quartz glass (fused silica) have a number of particularly practical properties:

  • high purity of the material
  • excellent optical properties
  • high temperature resistance up to 1000 °C
  • low thermal expansion
  • excellent thermal shock resistance
  • good transmission in the wavelength range from 190 nm to 3500 nm
  • low electrical conductivity
  • low dielectric losses
  • high resistance to acid, salt solutions and water
  • neutral behavior towards many substances

Quartz glass product catalog


Typical applications

  • plant and equipment construction
  • components in the semiconductor industry
  • material for light guides and optical components
  • applications under very high temperatures
  • electrical engineering
  • sight glasses and flow indicators
  • ideal glass for laboratory applications
  • excellent in the food industry
  • very popular in research and development

Chemical properties

Chemical composition
Silicium dioxide (SiO₂)

Hydrolytic resistance
Water resistance class HGB 1
Acid class S 1
Alkali class A 2

Physical properties

2.2 g/cm³

Refractive index

Mohs hardness
5,5 – 6,5

Compressive strength
1150 N/mm² at 20 °C

Tensile strength
50 N/mm² at 20 °C

Young’s modulus of elasticity
7,25 × 104

Softening temperature
1710 °C

Electrical properties

Dielectric resistance
3,70 (106 Hz, 20 °C )

Specific resistance
1018 Ω × m (at 20 °C)

Breakdown field strength
250 – 400 KV/cm (20 °C)

Delivery overview quartz glass rods


Delivery overview quartz glass tubes


You would like to learn more?

Don’t hesitate to contact us
Contact manufacturer of glass tubing and rods