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SIGRADUR® Glassy Carbon

Glassy carbon is a form of pure carbon embodying the properties of ceramic material and produced by the thermal decomposition of a three-dimensionally cross-linked synthetic resin.

Properties of SIGRADUR® Glassy Carbon

  • High purity
  • Stability in protective gas or vacuum to 3000° C and in air to 500°C
  • Corrosion resistance
  • Impermeability to gas and liquids
  • Exceptional hardness and strength
  • High-quality surface with excellent polishing characteristics
  • Good resistance to thermal shock
  • Good electrical conductivity
  • Inductive coupling in high-frequency fields
  • Resistance to wetting by many salt-like metallic and ceramic melts
  • Isotropy of physical and chemical properties

SIGRADUR® in Chemistry

SIGRADUR® glassy carbon, because of its extraordinary properties, offers advantages for a variety of applications in the chemical industry. Its high corrosion resistance makes it particularly suitable for use in analytical work. The product range includes crucibles, beakers, boats, dishes, etc., for fuming-off, evaporation, melting and decomposition. Glassy carbon is also employed in electrochemistry on account of its electrical conductivity and high corrosion resistance.

SIGRADUR® in Metallurgy

Melting vessels made from SIGRADUR® are employed for the melting of high-purity and noble metals and special alloys.

SIGRADUR® for Other Uses

  • Vessels for ultra-high purity materials technology, such as semiconductor connections and crystal growing
  • Crucibles for high-temperature differential thermal/thermal gravimetric analyses
  • Specimen holders and cuvettes for atomic absorption and atomic emission spectroscopy and multi-element analyses with plasma excitation
  • Protective tubes for thermo-elements and viewing tubes for pyrometers
  • Shaping tools for the glass industry SIGRADUR® is machined with diamond tools because of its extreme hardness. Shaped components can be machined before carbonization, although further machining may be necessary after carbonization if fine tolerances are required.
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