Decoding Ultra-Thin 6μm Polyester Film, Dielectric Strength, and Metallizing Performance for Advanced Capacitors
Product Overview
In the relentless push to make electronics smaller, faster, and more powerful, the components inside them must evolve. At the heart of every smartphone, electric vehicle, and power grid are film capacitors. And at the core of those capacitors is an ultra-thin dielectric film. Lumirror C21 PET Film is the ultimate material for this critical task. At a microscopic 6μm, it is designed specifically for capacitor applications, delivering exceptional processability for metallizing and outstanding dielectric properties. While global giants like Toray, DuPont PET Film, and SKC PET Film manufacture various films, the C21 grade is a masterclass in ultra-thin capacitor engineering.
The Core Specs: Mastering 6μm Engineering
What makes Lumirror C21 PET Film a critical component for electronics? The data sheet reveals a highly specialized profile:
- Ultra-Thin 6μm Gauge: Thinner film allows capacitors to be wound tighter, increasing capacitance in a smaller footprint. Achieving this thinness with absolute consistency is a testament to advanced manufacturing.
- Exceptional Mechanical Strength: Despite being only 6μm thick, it boasts a tensile strength of 225 MPa MD and 245 MPa TD. This high strength is vital to prevent breaking or stretching during the high-speed, high-tension capacitor winding process.
- Outstanding Processability: It is specifically engineered for excellent metallizing performance. The film maintains a flat, smooth face, ensuring that the zinc or aluminum coating adheres uniformly, which is critical for preventing capacitor failure.
- Robust Dielectric Properties: It offers excellent insulation resistance and dielectric breakdown strength, guaranteeing the safety and longevity of the final capacitor.
Key Applications Across Industries
The unique properties of Lumirror C21 PET Film make it indispensable for:
- Metallized Film Capacitors: Used in consumer electronics, power supplies, and automotive electronics (EVs).
- High-Voltage Applications: Where a reliable ultra-thin dielectric barrier is absolutely necessary.
- Miniaturized Electronics: Enabling the compact design of modern circuit boards.
Sourcing a Reliable Alternative
While the Toray Lumirror C21 PET Film is a top-tier standard for capacitors, global procurement teams often seek a Lumirror C21 Alternative to secure their supply chain and manage costs. A successful replacement requires a manufacturer that can precisely replicate the 6μm thickness while maintaining the high tensile strength and flawless surface needed for high-speed metallizing and winding.
Technical Characteristics
The following values represent the typical capabilities of our equivalent Capacitor-Grade PET Film range:
- Material: Biaxially Oriented Polyethylene Terephthalate
- Thickness Range: 6 μm
- Tensile Strength: MD 225 MPa / TD 245 MPa
- Thermal Shrinkage at 150°C, 30min: MD 1.3% / TD 0.1%
- Surface: Flat face, transparent
- UL746B: RTI Electrical 105°C, Mechanical 105°C
- Certifications: RoHS, REACH compliant
Why Choose Jinlu Film as Your Supplier
Jinlu Film is a leading manufacturer of high-performance specialty PET films. We offer a direct factory substitute for the Lumirror C21 series, delivering the same extreme thinness and dielectric reliability required for advanced capacitors. Whether you need standard master rolls or custom slitting for your metallizing lines, we offer factory-direct pricing, reliable global shipping, and quality that competes with top-tier brands.
Contact us today for a factory quote, technical data, or a sample of Capacitor-Grade PET Film.
