Durostone® FHT

Durostone® FHT - Flexible High-Temperature Laminate

Grade Durostone® FHT (Flexible High Temperature) Laminate provides numerous high-performance features and benefits, such as high flexibility and excellent dielectric strength at elevated temperatures.

Some attributes:

  • Highly flexible
  • Excellent dielectric strength
  • High heat resistance
  • Ideal for dry-type transformers
  • Easily fabricated
  • Asbestos-free

It also exhibits one of the highest UL® temperature indices in the industry for a flexible glass-reinforced polyester in 0.8 mm and 1.6 mm thicknesses:

  • 0.8 mm – 190° C Electrical
  • 1.6 mm – 200° C Electrical
  • 0.8 mm – 190° C Mechanical
  • 1.6 mm – 200° C Mechanical

With its high resistance to heat, FHT Laminate offers a cost-effective alternative to aramid paper in 220°C insulation systems. Typical applications include layer and core insulationfor dry-type transformers.

Colour

  • ivory

Standard sizes

  • 1828x914 mm
  • 2445x1255 mm

Thickness

  • 0,8 mm
  • 1,6 mm

Thermal endurance (UL 746 B)

190/200 (elec./mech.)

 

Technical Values Test method Unit FHT
Fibre reinforcement - - mat
Specific gravity - g/cm3 -
Standard colour - - ivory
Previous quality - - 1800
DIN 7735 type - - -
EN 60893/IEC 893 type - - -
Nema-LI.1 designation - - -
NFC 26153/26151 Standard ASTM D 792 g/cm3 -
Bending strength (perpendicular) ASTM D 790 MPa -
Modulus of elasticity (perpendicular) - - -
Compressive Strength (perpendicular) ASTM D 695 MPa 97
Impact strength (parallel) - - -
Tensile strength (parallel) ASTM D 638 MPa 72
Electric strength at 90°C (perpendicular) ASTM D 149
(Luft/Öl)
kV/mm 18 / 22
Breakdown voltage at 90°C (parallel) ASTM D 149 kV/25mm 60
Comparative tracking index UL 746A (V) 500
Tracking and erosion resistance - - -
Thermal conductivity ASTM C 177 W/mK 0,25
Thermal endurance UL 746 B T.I. 190/200
Insulating class - - -
Flammability IEC 60707 - -
Coefficient of linear expansion (parallel) ASTM D 696 10-6K-1 -

Remarks: Property variation possible in the area of 50mm, average - not guaranteed technical values. Tol. accord with EN 60893-3-5. The data mentioned are average values. We cannot accept any responsibility for their accuracy.


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Rainer Sanders
General Manager Sales & Marketing

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