Firefly 900 Millboard (FF900)

Note: This is a variation of Firefly Millboards.

Firefly non-asbestos / non-ceramic fiber Millboards are used in a wide variety of industrial applications for high temperature thermal insulation and gaskets. Firefly Millboards exhibit exceptional wear resistance. This, coupled with performance at temperature and ease of cutting, makes Firefly the ideal solution to all high temperature gasketing problems. In addition, Firefly Millboard has set the standard for roller cladding material, designed to meet the most stringent requirements of glass and steel producers worldwide.


Tensile Strength ( MPa )5
Tensile Strength ( psi )725.2
Continuous Operating Temperature ( ºC )1000
Continuous Operating Temperature ( ºF )1832
Moisture Content ( % )1
Standard Sheet Size ( in )40 x 40
Standard Sheet Size ( mm )1016 x 1016
Density ( lb/in³ )62.6
Density ( kg/cm³ )1000
Flexural Strength ( MPa )6
Flexural Strength ( psi )870.2
Thermal Conductivity ( BTU-in/hr-ft²-ºF )0.76
Thermal Conductivity ( W/m-ºK )0.11
Compressive Strength (at 3045 psi = 21 MPa) ( % )34
Electrical Resistance ( Per in² )26.3 ohm x 109
Electrical Resistance ( Per cm² )4.2 ohm x 109
Ignition Loss ( % )8
Shrinkage: 24 Hrs. at 1832ºF (1000ºC) ( % )1.8


Thescell namextremely versatile Millboards combine the most desirable characteristics of traditional Millboards with their own impressive features. These include:

  • Excellent thermal stability and high temperature mechanical strength
  • Good heat ageing properties
  • Good insulating properties
  • Resistance to molten metals
  • Excellent electrical resistance
  • Wide range of grades to match specific applications
  • Very clean product; die cuts and punches excellently
Firefly 900 Millboard (FF900)
A specially developed, low fuming, low smoke product which is recommended for high temperature molten metal contact applications.

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