Pressboard – Thick Electrical Grade Insulation Paper

Pressboard is made from 100% superior sulfate insulating wood pulp. It has good dielectric and high mechanical properties. Pressboard is widely used for transformers, high pressure electric apparatus, current transformers, switches, etc. It has bee……

Pressboard is made from 100% superior sulfate insulating wood pulp.

It has good dielectric and high mechanical properties. Pressboard is widely used for transformers, high pressure electric apparatus, current transformers, switches, etc.

It has been recognized to GB/T 8989.1 or IEC60641.

Properties Units Values
≤1.6mm ﹥1.6-3.0mm ﹥3.0-6.0mm
% ≤ ±7.5 ≤ ±5.0
Thickness Tolerance
Density g/cm3 1.0-1.2
MD ≥80 ≥80 ≥80
Tensile Strength TD Mpa ≥55 ≥55 ≥50
Elongation MD ≥6.0
 TD % ≥8.0
 MD % ﹤0.7
Shrinkage TD ﹤1.0
Thickness ﹤5.0
Moisture Content % ≤8.0
Ash Content % ≤1.0
Electric Conductivity Ms/m ≤8.0
 PH of Water Extractives 6.0-9.0
KV/mm ≥40 ≥30 ≥25
Electric Breakdown Strength in Oil

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