Transformer Cardboard Insulation

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Product Details

Electrical Insulation pressboard for Transformer


Transformer pressboard is made of high-purity 100% sulphate wood pulp processed by high-pressure processing. This product has high chemical purity and high mechanical strength. After immersion, it has both mechanical and electrical properties.


Transformer pressboard is widely used in oil-immersed transformers and reactors, capacitors, switches, etc.


Size: 1000*2000mm

Thickness: 0.8mm 1mm 2mm 3mm 4mm 5mm

Single carrier about: 500Kg

Sample: Avaliable

Custom services: Avaliable

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Pressboard Technical data:


PropertyUnitSpecificationStandard
Thickness tolerance%
≤1.6mm±7.5
>1.6-5.0±5.0
Apparent densityg/cm31.0-1.25
Tensile strengthMachine directionN/mm2≤1.6mm≥80
>1.6-3.0mm≥85
>3.0-5.0mm≥90
Cross machine directionN/mm2≤1.6mm≥45
>1.6-3.0mm≥50
>3.0-5.0mm≥55
ElongationMachine direction%
≥3.0
Cross machine direction≥4.0
ShrinkageMachine direction%
≤0.7
Cross machine direction≤1.0
Thickness direction≤6.0
Ash content%≤0.7
Oil absorption rate%≤1.6mm≥13.0
>1.6-3.0mm≥11.0
>3.0-5.0mm≥9.0
Electric conductivity water extractMS/m≤1.6mm≤5.0
>1.6-3.0mm≤6.0
>3.0-5.0mm≤8.0
Ph water extract/6.0-9.0
Voltage resistant strength (in oil)Kv/mm
≤1.6mm≥40
>1.6-5.0mm≥35
Moisture content%≤6.0

Tolerance of cutting size

mm±10mm
Skewness tolerancemm±10mm
ply bond/When tearing, one or several layers bursting with obviously rough sign&coming-out fibers


Welcome to contact Haotai, which is one of best transformer cardboard insulation manufacturers and suppliers in China, you can also get transformer cardboard insulation free sample from our factory.
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