1.Product introduction
The insulation of 6521 polyester film insulating paper is a two-layer electrical insulation composite material, which is made up of 100% sulfate wood pulp fiber insulating paper and 6020 high temperature resistant electrical insulating polyester film.

2.Product characteristics
6520 polyester film insulating paper has higher mechanical strength and better dielectric properties.

3.Product usage
6520 polyester film insulating paper is used for slot insulation, cushion insulation and turn-to-turn insulation in stator windings of motor and electrical appliances. At the same time, it is also applied to interlayer insulation, end seal insulation and liner insulation of dry-type transformer.

Serial number	Index name			Unit	Index value
1	Standard thickness			mm	0.15	0.17	0.20	0.25	0.30
2	Allowable thickness deviation			mm	±0.0020	±0.0020	±0.030	±0.030	±0.030
3	Nominal quantitation and allowable deviation			g/m²	190±27	215±32	250±38	310±46	370±55
4	Film standard thickness			um	25	25	25	25	25
5	tensile strength	Longitudinal	Unbending	N/10mm	≥135	≥150	≥180	≥210	≥270
		Longitudinal	After bending		≥80	≥90	≥100	≥120	≥160
		Transverse	Unbending		≥80	≥90	≥100	≥120	≥150
		Transverse	After bending		≥60	≥60	≥70	≥80	≥100
6	breakdown voltage, unbending		Unbending	KV	≥6.0
6	breakdown voltage, unbending		After bending	KV	≥5.0
7	Normal caking property				Non stratification
8	Hot caking property				130±2℃ 10min no bubble, no glue

许昌睿源绝缘材料有限公司

6521 blue color fish paper