100 Presspahn

 

Presspahn

ELEPHANTIDE® Grade K is manufactured on a multi-vat cylinder machine which enables a continuous web of processed fibres to be built up in homogeneous layers on successive cylinders. This construction provides maximum electrical and mechanical strength.

ELEPHANTIDE® Grade K is available in thicknesses between 0.1.mm to 1.0mm, and with lamination (pressboard) thickness of up and over 20mm can be archived. This grade is most frequently used in oil immersed transformers and power capacitors. Due to its purity of finish it can be used in monoisopropylbiphenyl (mipb's) and silicone based fluid impregnates. This ELEPHANTIDE® grade is also widely used in the insulation of fhp motors, either unsupported or in combination with a polyester film (yielding a Class 'E' insulation).

The excellent physical, electrical and mechanical properties of this grade make it ideally suited for punching, creasing and folding in to components used in an infinite variety of applications.

 

Technical Data
  
Standards AchievedJIS C 2305 PB-2 Pressboards for Electrical Purposes
 BS EN 60641 P.4.1.A Pressboards and Presspaper for Electrical Purposes
  
FurnishPure Kraft Wood Pulp 100%
  
ColourNatural Buff
  
Thickness Tolerance+/- 10%

 

Parameter
Unit
Typical Values
Apparent Density
g/cm^3
1.05 to 1.15
Tensile Strength  
MD
N/mm^2
80 to 120
CMD
N/mm^2
40 to 60
Electric Strength
KV/mm
In Air
In Oil
0.10 mm
 
11 to 15
98 to 101
0.127 mm
 
11 to 16
75 to 86
0.20 mm
 
11 to 16
72 to 88
0.25 mm
 
10 to 14
65 to 79
0.30 mm
 
10 to 13
68 to 72
0.40 mm
 
10 to 11
58 to 69
0.45 mm
 
9 to 11
56 to 62
0.50 mm
 
9 to 10
57 to 60
   
Conductivity
mS/m
2.0 to 4.0
pH of Aqueous Extract 
7 to 8.5
Ash Content
%
0.2 to 0.5

 

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