good transformer insulation electrical insulation presspaper pressboard

insulation presspaper pressboard is made from 100% superior sulfate insulating wood pulp   insulation presspaper pressboard has good dielectric and high mechanical properties.   Pressboard is widely used for transformers, high pressure electric apparatus, current transformers, switches, etc.     Technical Data of insulation presspaper pressboard :  

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
	TD		≥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