Insulation Pressboard for Transformer

Product Description

Isulation pressboard

Introduction:
It is made of 100% sulfate wood pulp and has high density (similar to T4). It has excellent properties of very flat, highest mechanical and electrical strength and little shrinkage. It is used in oil-immersed power transformer.
Pressboard standard: IEC 641-3-1
Thickness: 1.0-8.0mm
Size (mm): 6300*3200, 6300*1600, 4200*3200, 4200*1600, 3200*3150, 3200*2100, 2000x1000 1000x1000
 

	Index.		Unit	Values
				≤1.6	>1.6~3.0	>3.0
1	Nominal thickness tolerance		%	≤10(±)
2	Nominal Grammage		g/cm3	1.00~1.20	1.00~1.25	1.15~1.30
3	Shear strength ,M.D.		Mpa	≥100	≥105	≥110
4	Shear strength, C.M.D.		Mpa	≥75	≥80	≥85
5	Elongation (M.D.)		%	≥3.0
6	Elongation (C.M.D.)		%	≥4.0
7	Shrinkage		%	≤10.0	≤7.5	≤5.0
8	Shrinkage which would resume		%	≥45	≥50	≥50
11	Shrinkage:	M.D.	%	≤0.5
		C.M.D.		≤0.7
		Thickness direction		≤4.0
12	Moisture content		%	≤6.0
13	Ash content		%	≤1.0
14	Electrical conductivity of aqueous extract		ms/m	≤1.6	>1.6~3.0	>3.0
15	Aquesous extract (PH)		-	6~9
16	Oil absorption		%	≥11.0	≥9.0	≥7.0
17	Voltage resistant strength(In air)		MV/m	≥12	≥11	≥10
18	Voltage resistant strength(In oil)		MV/m	≥40	≥35	≥30