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   Technical data for transformer board

Property Unit Unbleached sulphate pulp
  Thickness deviation % -
  ≤0.5mm ≤±10.0
  0.5mm -1.6mm ≤±7.0
  〉1.6mm ≤±7.0
  Apparent density g/cm3 -
  ≤0.5mm 1.10 -1.25
  0.5mm -1.6mm 1.00 - 1.25
  1.6mm - 3.0mm 1.00 - 1.25
  Tensile strength MD N/mm2 -
  0.5mm - 3.0mm ≥90
  Tensile strength CMD N/mm2 -
  0.5mm ≥35
  0.5mm - 3.0mm ≥50
  Shrinkage % -
  MD ≤1
  CMD ≤1.4
  Thickness deviation ≤6
  Elongation % -
  MD ≥3.5
  CMD ≥4
  Ash content % ≤1
  PH of aqueous extract - 6 - 9
  Oil absorption % -
  1.0mm - 1.6mm ≥9
  1.6mm - 3.0mm ≥9
  3.0mm - 8.0mm ≥9
  Conductivity of aqueous extract mS/m -
  ≤1.6mm ≤10
  1.6mm - 3.0mm ≤10
  Electrical strength in oil kV/mm -
  0.5mm - 1.0mm ≥35
  1.5mm - 2.0mm ≥30
  2.5mm ≥27
  3.0mm  ≥24
  Moisture content % -
  0.1mm - 0.5mm 6 - 10
  0.5mm - 1.5mm 4 - 9
  1.5mm - 3.0mm 5 - 9

 

 
 
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