Duratec®

750 &1000

Duratec is a non-asbestos, dense calcium silicate based engineering board. Available in 750 and 1000 grades, it exhibits good thermal stability, low shrinkage and excellent mechanical and electrical properties. The 750 grade has been formulated to provide higher strength characteristics and offers improved electrical performance and arc resistance at elevated temperatures.

Both grades can be machined to a high definition and close toleranced finish, allowing for the creation of complex machined components. Where operating as an electrical insulator it is recommended the finished shape is sealed with a high temperature silicate solution to prevent moisture ingress.

Other benefits include:

  • Maximum service temperature 1000°C
  • High compressive strength
  • Asbestos and ceramic fibre free
  • Low out-gassing in vacuum conditions
  • Good arc resistance and anti-tracking properties
  • Machinable
Typical Composition
  • Calcium Silicate – Hydrate
  • Wollastonite
  • Cellulose
USED IN
  • Induction Furnace Casings
  • End Plates
  • Foundry Core Plates
  • Soldering, Brazing and Welding Jigs
  • Electrical Insulation Components
  • Element Supports
  • Arc Chutes

KEY DATA
GRADE 750 1000
DENSITY kg/m3 1400 1400
STRENGTH
Flexural MPa 23 16
Compressive MPa 55 31
MAXIMUM SERVICE TEMPERATURE °C 1000 1000
THERMAL CONDUCTIVITY @ 750°C W/mK 0.49 0.37
SHRINKAGE @ 750°C (length, width/thickness) % 0.14/1.1 0.12/0.8
LOSS ON IGNITION % 7.3 5.3
FLATWISE ELECTRICAL STRENGTH kV/m 7300 4700
ARC RESISTANCE Stage 40 (40 mA) >420 seconds >420 seconds
VOLUME RESISTIVITY @25°C Ω/cm 9.0 x 1010 7.5 x 10
SURFACE RESISTIVITY @25°C Ω 10.0 x 1010 4.1 x 1010
RELATIVE RESISTIVITY @25°C 7.6 4.7
DISSIPATION FACTOR @25°C 250 640
COMPARATIVE TRACKING INDEX >500 600
The data provided is taken from average test results conducted under standard procedures and conditions and should not be used for specification purposes.

For technical assistance call:+44(0)174428304

CONTACT

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Esspee Fabrications Ltd
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St. Helens
Merseyside
WA9 1DZ
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