Decoding Low Heat Shrinkage, Anti-Curling Performance, and Dielectric Strength for FBT and FPC Applications
Product Overview
In the highly precise world of electronics manufacturing, heat is the ultimate enemy of accuracy. When a polyester film is exposed to high temperatures during soldering or lamination, it tends to shrink and curl. This curling can misalign delicate circuits, cause short circuits, or ruin the structural integrity of a transformer. This is the exact problem that Lumirror S56 PET Film is engineered to solve. As a heat-stabilized film, it delivers exceptionally low and balanced heat shrinkage. While global giants like Toray, DuPont PET Film, and SKC PET Film offer broad portfolios, the S56 grade stands out as the definitive solution for applications where zero distortion is mandatory.
The Core Specs: Mastering Thermal Stability
What makes Lumirror S56 PET Film a critical material for high-end electronics? The data sheet reveals a highly specialized performance profile:
- Outstandingly Low Heat Shrinkage: At 150°C for 30 minutes, the machine direction (MD) shrinkage is just 0.45% to 0.52%. This ensures the film stays dimensionally stable during high-heat processes.
- Well-Balanced Anti-Curling Performance: The shrinkage in the transverse direction (TD) is tightly controlled at 0.16% to 0.20%. Because the MD and TD shrinkage are closely balanced, the film avoids curling (warping) after being heated or laminated.
- Optimized Handling (Slightly Hazy): It features a slightly hazy surface that provides excellent slip and anti-blocking properties, ensuring smooth feeding in automated winding and circuit printing processes.
- Reliable Dielectric Strength: With a breakdown voltage reaching up to 19.7 kV (at 125μm), it guarantees safe electrical insulation for demanding transformer applications.
Key Applications Across Industries
The unique thermal stability of Lumirror S56 PET Film makes it indispensable for:
- Flyback Transformers (FBT): Providing reliable, heat-resistant insulation between coils where high temperatures are standard.
- Flexible Printed Circuits (FPC): Serving as a stable base or cover layer that won’t curl during soldering or component assembly.
- Heat-Sensitive Laminates: Used in any specialized application where thermal shrinkage must be minimized.
Sourcing a Reliable Alternative
While the Toray Lumirror S56 PET Film is a gold standard for thermal stability, global buyers often look for a Lumirror S56 Alternative to optimize supply chains. A successful replacement requires a manufacturer that can precisely replicate this low shrinkage profile and the balanced MD/TD ratios. If the film curls even slightly, automated PCB manufacturing lines will fail.
Technical Characteristics
The following values represent the typical capabilities of our equivalent Low-Shrinkage PET Film range:
- Material: Heat-Stabilized Biaxially Oriented Polyethylene Terephthalate
- Thickness Range: 75 μm, 100 μm, 125 μm
- Tensile Strength: MD 191 to 211 MPa / TD 200 to 219 MPa
- Thermal Shrinkage at 150°C, 30min: MD 0.45% to 0.52% / TD 0.16% to 0.20%
- Breakdown Voltage: 14.9 kV to 19.7 kV
- 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 functional PET films. We offer a direct factory substitute for the Lumirror S56 series, delivering the same low heat shrinkage and anti-curling properties required for FBT and FPC manufacturing. Whether you need standard rolls or custom slitting, we offer factory-direct pricing, reliable global shipping, and quality that rivals top-tier brands.
Contact us today for a factory quote, technical data, or a sample of Low-Shrinkage PET Film.
