Polyester Film

Polyester film is a widely used electrical insulation material offering good dielectric strength, mechanical properties, and thermal resistance. It provides excellent dimensional stability and moisture resistance.

It offers good dielectric strength, heat stability, high mechanical strength, dimensional stability, transparency and airtightness. It is used for electrical insulation in small and medium electrical machines and for cable wrapping, and widely as insulation and film composites in household appliances. A milky-white grade is also available.

Polyester Film Production Workshop — Workshop for polyester film production

No.	Item	Property	Unit	Value
1	Thickness	Nominal thickness (μm)	%	0.23
	tolerance	25 - 100		≤±5
	tolerance	> 100		≤±4
2	Tensile strength	Nominal thickness (μm)	Mpa	-
	(lengthwise & crosswise)	25 - 100		≥150
		> 100 - 190		≥140
		> 190		≥110
3	Break elongation	Nominal thickness (μm)	%	-
	(lengthwise & crosswise)	25 - 50		≥60
	(lengthwise & crosswise)	> 50		≥80
4	Heat shrinkage	Nominal thickness (μm)	-	-
	(lengthwise & crosswise)	25 - 50	%	≤3
		> 50		≤2
		6020SL		lengthwise ≤1.0
		150°C 30min		crosswise ≤0.5
5	Dielectric strength	Nominal thickness (μm)	V/μm	-
		25		≥174
		36		≥150
		50		≥130
		75		≥105
		100		≥90
		125		≥75
		150		≥70
		188		≥65
		250		≥60
		300		≥55
		350		≥50