MatWeb - Material Property Data Advertise with MatWeb!     Register Now
Data sheets for over 135,000 metals, plastics, ceramics, and composites.
MatWeb - Material Property Data HOME  •   SEARCH  •   TOOLS  •   SUPPLIERS  •   FOLDERS  •   ABOUT US  •   FAQ  •   LOG IN    
Recently Viewed Materials (most recent at top)  

Login to see your most recently viewed materials here.

Or if you don't have an account with us yet, then click here to register.

  Searches:   Advanced  | Category  | Property  | Metals  | Trade Name  | Manufacturer  | Recently Viewed Materials
LECO for Empowering Results
Schott ZERODUR® K20 Glass Ceramic
Categories: Ceramic; Glass; Optical

Material Notes: The high temperature ZERODUR® K2 glass ceramic material contains a crystal phase of more than 90% Keatite, produced by thermal transformation from the semitransparent ZERODUR® material. ZERODUR® K20 can be used at higher application temperatures compared to ZERODUR®. The material has high temperature stability and low thermal expansion and does not change its properties during multiple temperature cycles.


  • Low coefficient of thermal expansion together with high long term temperature stability up to 850°C
  • Can be matched with low thermal Expansion metal alloys, e. g. Invar®
  • Excellent homogeneity and internal quality
  • A transmission of more than 90% in the visible with a matte brilliant white finish
  • Free of pores and polishable to very low surface roughness levels
  • Large-scale parts can be produced with dimensions in the meter range
  • Mechanical and optical components within high energy laser systems
  • Diffuse reflectors for laser-cavities
  • Mold material in hot forming processes (glass, plastic etc.)
  • High precision manufactured components
  • Ceramic engine components
  • Calibration standards for optical and mechanical probes

Information provided by SCHOTT.

Available Properties
  • Density
  • Hardness, Knoop, 0.1/20
  • Modulus of Elasticity
  • Poissons Ratio
  • Shear Modulus, Calculated
  • CTE, linear
  • CTE, linear
  • CTE, linear
  • Specific Heat Capacity
  • Thermal Conductivity
  • Maximum Service Temperature, Air
Property Data

This page displays only the text
of a material data sheet.

To see MatWeb's complete data
sheet for this material (including
material property data, metal
compositions, material suppliers,
), please click the button below.

Manufacturer Notes:
Schott Glas Mainz

Category Notes

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.


Elmet Technologies
Please read our License Agreement regarding materials data and our Privacy Policy. Questions or comments about MatWeb? Please contact us at We appreciate your input.

The contents of this web site, the MatWeb logo, and "MatWeb" are Copyright 1996-2020 by MatWeb, LLC. MatWeb is intended for personal, non-commercial use. The contents, results, and technical data from this site may not be reproduced either electronically, photographically or substantively without permission from MatWeb, LLC.