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HT Glass Fibre Technical Information

HT750 and HT800 products are made from glass yarns which have been specially treated to withstand higher temperatures than “E” glass yarns. The higher temperature glass yarns are generally textured, voluminized or twisted and can also be reinforced with steel wire to increase the mechanical strength of the product.

The two products are distinguished by their operating temperatures and colour:

  • HT750 – continuous temperature 700°C, short term 750°C in optimum conditions. Light blue or grey in colour.
  • HT800 – continuous temperature 750°C, short term 800°C in optimum conditions. green in colour.

HT glass fibre has the following key characteristics for thermal applications:

  • High mechanical strength.
  • Low thermal conductivity.
  • Good dimensional stability.
  • Good electrical properties.
  • Good resistance to chemical agents.
  • High thermal resistance.
  • Incombustible.
  • Good flexibility.

BASIC COMPOSITION OF HT GLASS FIBRE (APPROXIMATE) HT750 and HT800
SiO2 58%
CaO 16%
Al2O3 13%
B2O3 7%
MgO 4%
Na2O-H2O 1%
Others 1%

GENERAL PROPERTIES OF HT GLASS FIBRE HT750 HT800
Colour Blue or Grey Green
Fibre Diameter 6 - 9 micron 6-13 micron
Linear Shrinkage at 700°C 1% 1%
Max Continuous Temperature 700°C  (750°C - short term in optimum conditions) 750°C  (800°C - short term in optimum conditions)
Fire Reaction Incombustible Incombustible

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