Electrical Pressboard

Electrical pressboard is made of 100% sulphate wood pulp with high purity and processed at high pressure.

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Description of Electrical Pressboard 

Electrical pressboard is made of 100% sulphate wood pulp with high purity and processed at high pressure.

Electrical pressboard has high mechanical strength and good compatibility with transformer oil. It is used in oil-immersed transformers, reactors, capacitors and switches, etc

High density electrical pressboard has greater tightness, smaller shrinkage and good evenness. It is mainly used in transformers, capacitors, mutual inductors and other equipment (oil gap pad for cake winding, partition, cardboard tube, corrugated paper, iron yoke insulation, clip insulation and end insulation winding clamp plate, etc.).

Specification of Electrical Pressboard

Common specification: thickness: 0.5/1/2/3/4/5mm

Regular length * width: 1000*2000

Other length * width: 3200*1600/3200*2100/3200*4200/2260*1470/2200*1130

Product standard:GB/T19264.3-2003 IEC60641-3-1992
Number Index name Unit Electrical pressboard High density board
1mm 2mm 3mm 4mm 5mm ≤1.6mm >1.6~3.0mm >3~6.0mm >1.6~8.0mm
Index
1 Thickness & tolerance   % ±7.5 ±5.0 ±7.5 ±5.0
2 Apparent density
 
g/m2 1.0~1.2 1.0~1.2 1.10~1.25 1.15~1.30 1.20~1.30
3 Moisture content   % ≤8 ≤6.0
4 Water extract PH   6.5-8.5
5 Ash content    % ≤1.0
6 Oil absorbency    % ≥10 ≥9
7 Contamination for transformer oil   No pollution
8 Tensile strength MD(Longitudinal ) N/10mm ≥110 ≥105
CD(transverse) ≥80 ≥85 ≥80 ≥80
9 Elongation MD(Longitudinal) % ≥7.0 ≥3.0
CD(transverse) ≥9.0 ≥4.0
10 Shrinkage
 
MD(Longitudinal) % ≤0.7 ≤0.5
CD(transverse) ≤1.0 ≤0.7
       (Thickness) ≤5.0 ≤5.0
11 Electric strength
 
In air   KV/mm ≥10 ≥11
In Oil   ≥40 ≥30 ≥25 ≥40 ≥35 ≥35

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