Dalfratex® is a range of inorganic fibres and textiles that are capable of operating continuously at 1000°C and up to 1600°C for limited periods.

It is available in many forms such as:

  • Textile cloths,
  • Tapes,
  • Sleevings,
  • Cords,
  • Braided packings,
  • Ropes,
  • Bulk fibres & batts.

They will not melt or vaporize until temperature exceeds 1700°C, and have a high resistance to thermal shock.

Dalfratex products also provide flexible electrical insulation at temperatures as high as 1000°C. They are composed of continuous filaments of amorphous silica, which combine the flexibility of fibres and textiles, with the refractory properties of silica.

In order to service the needs of a wide range of applications the majority of Dalfratex products are available in two basic forms – standard and pre-shrunk. The standard form shrinks during initial heating and products of this type have letter ‘U’ incorporated into the code number. As their name implies, the pre-shrunk forms have been factory treated to confer better dimensional stability in high temperature use.

In addition to these forms a wide range of sacrificial organic finishes are available which may be applied to particular products where required for specific end uses.

Typical Applications:

  • Aerospace (gas turbine rocket engines)
  • Metallurgical/steel production
  • Glass manufacture
  • Fire protection
  • Electrical heating
  • Pipeline and vessel fabrication
  • Gas production
  • Nuclear power
  • Electricity generation
  • Petrochemical


  • Low thermal conductivity
  • Low heat storage
  • Reduces fume emission around refractory
  • Excellent thermal shock resistance
  • Resistance to gas velocity
  • Easy to install
  • Adheres to most ceramic and metallic surfaces
  • Excellent corrosion resistance
  • Inert to most chemicals
  • Impermeable to molten aluminium, zinc, copper & lead
  • Contains no asbestos

Chemical Analysis – Calcined Basis

Silica                                      98.57%

Alumina                                  0.47%

Iron Oxide                              0.08%

Lime                                       0.05%

Magnesia                               0.07%

Titania                                    0.30%

Alkalis                                    0.13%

Boric Oxide                           0.06%