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ELEPHANTIDE® Grade K Presspaper
 
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 Achieved JIS C 2305 PB-2 Pressboards for Electrical Purposes
  BS EN 60641 P.4.1.A Pressboards and Presspaper for Electrical Purposes
   
Furnish Pure Kraft Wood Pulp 100%
   
Colour Natural 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

 

These figures are typical values only and as such do not constitute a specification.

 

 


Presspahn Ltd, Wharncliffe Works, Harrogate Road, Bradford, BD2 3TB
Tel: +44 (0) 1274 636333 Fax: +44 (0) 1274 626024
E:Mail:Sales@Presspahn.com