Transformer Insulation Material Press Paper Board for Electrical Insulating Pressboard

• Material: Wood Pulp
• Color: Natural Brown or Red
• Tensile Strength: Good
• Type: Insulation Sheet
• Application: High Temperature
• Rated Voltage: 35kv-110kv
• Model NO.: 3050
• Name: Insulation Pressboard
• Transport Package: Wooden Cases or Wooden Pallet10 Ply Plywood
• Trademark: Powerwell
• Origin: Hunan, China
• Production Capacity: 50 Ton/Tons Per Month

Product Description

Item	Test standard	Measured	Standard value
		value
Thickness tolerance	IEC 641-2	≤ 1.6 mm 6.00 %	±7.5 %
		> 1.6 - 8.0 mm 3.00 %	± 5.0 %
Apparent density		≤ 1.6 mm 1.09 g/cm³	1.00 - 1.20 g/cm³
		> 1.6 - 4.0 mm 1.15 g/cm³	1.10 - 1.25 g/cm³
Min. tensile strength M.D. unfolded		≤ 1.6 mm 75 N/mm²	70 N/mm²
		> 1.6 - 4.0 mm 90 N/mm²	80 N/mm²
Min. tensile strength C.M.D, unfolded		≤ 1.6 mm 60 N/mm²	50 N/mm²
		> 1.6 - 4.0 mm 70 N/mm²	55 N/mm²
Min. elongation M.D, unfolded		6.50%	6.00%
Min. elongation C.M.D, unfolded		8.10%	8.00%
Max. moisture content		7.60%	8.00%
Max. ash content		0.80%	2.00%
pH of aqueous extract		6.3	6.0 - 9.0
Max. shrinkage M.D		0.40%	0.50%
Max. shrinkage C.M.D		0.60%	0.70%
Max. thickness shrinkage		3.90%	5.00%
Min. oil absorption		≤ 1.6 mm 13.7 %	11.00%
		> 1.6 - 4.0 mm 10.6 %	9.00%
Compressibility C		≤ 1.6 mm 9.4 %	10.00%
		> 1.6 - 4.0 mm 5.7 %	7.50%
Revers. part of compressibility Crev		≤ 1.6 mm 54 %	45%
		> 1.6 - 4.0 mm 71 %	50%
Min. breakdown voltage in oil		≤ 1.6 mm 15 kV/mm	12 kV/mm
		> 1.6 - 4.0 mm 13 kV/mm	10 kV/mm
Max. conductivity of aqueous extract		≤ 1.6 mm 3.3 mS/m	10 mS/m
		> 1.6 - 4.0 mm 3.5 mS/m	10 mS/m