Electrical Laminated Wood Boards Plywood Sheet

Plywood is produced by gluing together, in high temperature (145-150ºC) and under high pressure (6-12 MPa), 2mm-thick beech veneers with durable, moisture-resistant adhesives.

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Description

Plywood is produced by gluing together, in high temperature (145-150ºC) and under high pressure (6-12 MPa), 2mm-thick beech veneers with durable, moisture-resistant adhesives.

Specification:

Thickness: 10-70mm

Standard Length &Width:

3000 * 1500 mm

2400 * 1200 mm

2000 * 1000 mm

2200 * 1200 mm

Technical Parameter

Item	Index		Unit	Index data
Physical property	Density		T/m3	0.9-1.1
	Rate of water content		%	≤ 7
	Thickness shrinkage ratio after drying		%	≤ 1.5
	Oil absorption rate		%	> 10
	Ultimate thickness expansion rate after oil impregnation		%	≤ 0.5
	Compatibility with transformer oil			Good
Mechanical property	Tensile strength	Parallel direction	Mpa	≥50
	Tensile strength	Parallel direction	Mpa	≥50
	Compressive strength	Parallel direction	Mpa	≥50
	Compressive strength	Vertical direction	Mpa	≥120
	Bending strength	Parallel direction	Mpa	≥100
	Bending strength	Vertical direction	Mpa	≥100
Electrical property	Volume resistivity		MΩ/m	≥ 10a
	Electrical strength (50Hz)	20ºC Transformer (Vertical)	Mv/m	≥9
		90ºC Transformer (Vertical)	Mv/m	≥7
		20ºC Transformer (Parallel)	Kv/m	≥45
		90ºC Transformer	Kv/m	≥35
	Dielectric loss factor (tg δ) (50Hz)	20ºC Transformer oil		≤0.2
	Dielectric loss factor (tg δ) (50Hz)	90ºC Transformer oil		≤0.13
	Relative dielectric constant (∑ n)	20ºC Transformer oil		≤3
	Relative dielectric constant (∑ n)	90ºC Transformer oil		≤3.6