PET Film

Description

SIDA’s PET polyester film is manufactured through advanced biaxial orientation process from polyethylene terephthalate (PET) resin, creating a superior electrical insulation material that meets international standards for safety and performance.

Key Manufacturing Features:

Multi-layer Structure: Engineered composite of PET films with specialized adhesive bonding
Biaxial Orientation: Provides excellent dimensional stability and mechanical strength
Precise Thickness Control: Tolerance within ±5% for consistent electrical performance
Surface Treatment: Optimized for coating, lamination, and adhesive compatibility

Technical Advantages:

Superior Dielectric Properties: Breakdown voltage exceeds 50 MV/m (industry standard)
Thermal Stability: Maintains performance at 120°C continuous operation
Low Water Absorption: <0.5% prevents degradation in humid environments
Chemical Resistance: Withstands oils, solvents, and industrial chemicals
Mechanical Strength: Tensile strength >150 MPa MD, >140 MPa TD
Low Shrinkage: <2% at 150°C for 4 hours ensures dimensional accuracy

Certifications & Standards:

UL Recognition: UL File No. E310670
IEC 60674-3-2:1992 (MOD) Compliant
GB/T 13542.4-2009 Certified
RoHS & REACH Compliant
ISO 9001:2015 Manufacturing

Technical Data Tables

Property		Unit	Index											Test method
Thickness		μm	23	36	50	75	100	125	150	175	188	200	250	GB/T 13542.2- 2021
Tensile strength	MD	MPa	162	165	150	158	160	162	164	162	167	171	174
Tensile strength	TD	MPa	184	191	170	176	183	173	174	184	183	179	182
Elongation at break	MD	%	118	125	120	130	128	124	138	142	138	145	143
Elongation at break	TD	%	92	98	96	101	110	100	113	118	103	105	110
Heat shrinkage (150℃,30min)	MD	%	1.3	1.3	1.3	1.3	1.2	1.2	1.2	1.2	1.1	1.1	1.1
Heat shrinkage (150℃,30min)	TD	%	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.1	0.1	0.1	0.1
Light transmittance		%	88.2	88	87.8	87.8	87.7	87.5	87.8	88.4	88.4	88.4	88.3	GB/T 2410– 2008
Haze		%	1.3	1.8	2.5	2.5	2.8	2.8	3.4	3.4	3.4	3.5	3.5	GB/T 2410– 2008
Electrical strength	V/μ m		174	162	142	126	114	81	76	68	66	63	61	GB/T 1408.1- 2016
Dissipation Factor （50H）≤	—	3×10-3											GB/T 1409- 2006
Relative permittivity （50Hz）	—	2.9～3.4											GB/T 1409- 2006
Volume resistivity ≥	Ω.m	1.0×1014											GB/T 31

Note:The product specifications provided are for reference purposes only. Please refer to the actual product for final specifications. We also offer various sizes and thicknesses to meet your specific needs. For further customization, please contact us.

Application Scenarios

1. Transformer Insulation Cylinders

Usage: Primary insulation between HV and LV windings in dry-type transformers (10kV and below)

Benefits: Reduces main air gap distance, minimizes transformer size and cost
Installation: Forms cylindrical barriers between windings, withstands mechanical stress during coil winding
Performance: Maintains dielectric integrity under 20-100kV operating voltages

2. Motor Slot Liners & Wedges

Usage: Ground insulation in low-voltage motors (E-class and B-class)

Benefits: High mechanical strength for automatic insertion, excellent wear resistance
Application: Slot liners, phase insulation, interturn insulation
Compatibility: Works with varnished motor applications, resists varnish solvents

3. Wire & Cable Wrapping

Usage: Turn-to-turn insulation for coils and electromagnetic wires

Benefits: Thin profile saves space, superior dielectric strength
Processing: Can be slit into tapes (8mm+ width) for automated wrapping
Endurance: Withstands winding tension and thermal cycling

4. Flexible Composite Materials

Usage: Base material for DMD, NMN laminates when combined with aramid paper or other substrates

Benefits: Excellent adhesion properties, consistent thickness
Processing: Compatible with hot-press lamination and adhesive bonding
Outcome: Creates high-performance multi-layer insulation systems

5. Capacitor Dielectric

Usage: Dielectric separator in film capacitors

Benefits: Low dissipation factor, high dielectric constant stability
Performance: Supports self-healing capacitor designs
Reliability: Long service life under AC/DC stress

6. Special Industrial Applications

Refrigeration: Hermetic motor/compressor assemblies in HVAC systems
Packaging: High-barrier packaging for electronic components
Renewable Energy: Wind turbine generator insulation
Automotive: EV traction motor insulation (with thermal class upgrades)

Testing Standards & Quality Assurance

International Compliance

IEC 60674-3-2:1992 – “Plastic films for electrical purposes – Specifications for individual materials – Balanced biaxially oriented PET films”
GB/T 13542.4-2009 – Chinese National Standard for PET films (modified adoption of IEC 60674)
UL 1446 – “Systems of Insulating Materials” – Component recognition
IEC 60243-1 – Electrical strength testing methods
IEC 60085 – Thermal classification of insulation materials

In-House Testing Capabilities

Electrical Testing: Breakdown voltage, dielectric strength, partial discharge (up to 50kV)
Mechanical Testing: Tensile strength, elongation, tear resistance (MD/TD)
Thermal Testing: Thermal aging, shrinkage, dimensional stability
Environmental Testing: Humidity resistance, chemical resistance, UV stability
Dimensional Testing: Thickness profile, width accuracy, roll winding quality

Certification & Documentation

UL File No.: E310670 (pending/customizable)
RoHS Compliance: 2011/65/EU & 2015/863/EU
REACH Declaration: SVHC-free compliance
ISO 9001:2015 – Quality Management System
SGS Test Reports: Available upon request
Material Safety Data Sheet (MSDS): Provided

Frequently Asked Questions (FAQs)

Q1: What is the difference between 6020 transparent and 6021 milky white PET film? A: 6020 transparent film is primarily used as a laminate base with other substrates. 6021 milky white film has higher direct insulation properties and can be used standalone for electrical insulation. Both are Class E (120°C) materials with UL E310670 recognition.

Q2: Can SIDA PET film be customized in width and thickness? A: Yes. Standard width is 1000mm, but we can produce from 100mm to 1500mm. Thickness range is 0.075-0.35mm with ±5% tolerance. Custom roll weights (50-300kg) and lengths are also available.

Q3: What is the storage life and conditions? A: Storage period is 18 months from production date when stored in a dry, clean environment at 15-30°C, humidity <70%, away from direct sunlight, heat sources, and pressure. Keep original packaging sealed.

Q4: How does PET film perform in oil-immersed transformers? A: Our PET film demonstrates excellent compatibility with transformer oil (mineral and synthetic). It shows no contamination, maintains dielectric strength, and has oil absorption <0.5% per IEC 60674-2.

Q5: What are the minimum order quantities? A: Standard MOQ is 500kg per thickness. For custom slitting into tapes, MOQ is 300kg. Sample rolls (10-20kg) available for testing.

Q6: Can PET film be used for Class F (155°C) applications? A: Standard PET film is Class E (120°C). For Class F applications, we recommend upgraded formulations or NMN composites. Contact our technical team for high-temperature solutions.

Q7: How is breakdown voltage tested and what values can I expect? A: Tested per IEC 60243-1 using 50Hz AC voltage. Example: 0.15mm film achieves ≥12kV breakdown, 0.25mm achieves ≥20kV. Values are higher in oil immersion.

Q8: Is the product suitable for automatic winding machines? A: Yes. The film’s tensile strength (≥150 MPa) and dimensional stability make it ideal for high-speed automatic coil winding and insertion equipment.

Q9: What’s the lead time for orders? A: Standard products ship within 10-15 days. Custom orders require 15-20 days depending on specifications and quantity.

Q10: Can you provide cutting/slitting services? A: Yes. We can slit master rolls into tapes (minimum 8mm width) or sheets. Tighter tolerances available for precision applications.

Ordering Information

Packaging:

Interior: Plastic bag sealed with desiccant
Exterior: Carton box or pallet
Roll weight: 50-70kg standard (customizable)
Labeling: Product code, thickness, width, batch number, UL mark

Shipping & Handling:

Store horizontally, avoid vertical stacking pressure
Keep away from sharp objects
Transport temperature: -10°C to 40°C
Humidity protection during transit

Technical Support:

Free sample evaluation
Application engineering consultation
Custom development for special requirements
Testing report and certification assistance