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.

Properties Units   Values
≤1.6mm ﹥1.6-3.0mm ﹥3.0-6.0mm
Thickness Tolerance % ≤ ±7.5 ≤ ±5.0
Density g/cm3 1.0-1.2
Tensile Strength  MD Mpa ≥80 ≥80 ≥80
 MD ≥55 ≥55 ≥50
Elongation  MD % ≥6.0
 TD ≥8.0
Shrinkage  MD % ﹤0.7
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
Electric breakdown Strength in oil KV/mm ≥40 ≥30 ≥25