Why FPC Manufacturers Choose 50μm BOPET Film for Printed Circuits

50μm High-Transparency BOPET Film Upgrades Electronic Printing Yield for FPC Substrates

As consumer electronics, smart homes, and automotive electronics shift toward thinner and highly integrated designs, the flexible printed circuit (FPC) and membrane switch industries are demanding higher-performance substrates. A PET film's dimensional stability, ink adhesion, and insulation properties have become critical factors influencing circuit reliability and production yield.

Recently, HT10—a 50μm high-transparency BOPET polyester film developed by Shenzhen Xuanhe Technology Co., Ltd. for electronic printing and structural insulation—has gained significant attention from FPC and membrane switch manufacturers due to its exceptional properties.

High Wetting Surface Treatment for Stable Printing

For silver paste, carbon paste, and UV ink printing, surface treatment determines circuit adhesion. After professional surface treatment, HT10 achieves a surface wetting tension of 56.0 mN/m, significantly enhancing ink wetting for more uniform and complete conductive traces. Crucially, it passes the JIS K5600 cross-cut adhesion test with a perfect 100/100 score, minimizing ink peeling and delamination risks, which translates to higher yields and production efficiency for FPC manufacturers.

263 V/μm Breakdown Voltage for Enhanced Safety

With miniaturized electronics and shrinking circuit pitches, reliable insulation is vital. HT10 delivers a breakdown voltage of 263 V/μm (JIS C2318). This robust insulation ensures maximum operational stability and safety across various applications, from home appliance control panels to automotive electronic buttons and industrial control systems.

Precision Dimensions Under High-Temperature Processes

High-temperature curing is essential in electronic printing, making thermal shrinkage resistance crucial to prevent circuit misalignment. HT10 excels in dimensional stability with an MD thermal shrinkage of 0.8% and TD thermal shrinkage of 0.0%. This near-zero transverse shrinkage ensures precise alignment even after multiple baking cycles, making it ideal for high-precision screen printing and multi-layer circuit processing.

High Strength and Flexibility for Long-Term Durability

Designed to withstand repetitive bending in touch keys and remote controls, HT10 exhibits outstanding mechanical performance:

• Tensile Strength: 215 MPa (MD) / 242.5 MPa (TD)

• Elongation at Break: 175% (MD) / 147% (TD) Its superior flexibility and fatigue resistance substantially extend the lifespan of end products.

High Transparency, Low Rainbow Effect, and Dual Protection

HT10 features a high-transparency, low-rainbow-effect design that minimizes optical interference, ensuring a premium visual clarity for touch panels and appliance displays. Additionally, it comes protected with dual-sided PE protective film (green/white) to prevent scratches during transport, die-cutting, and processing.

Versatile Applications and Specifications

HT10 is widely used in FPCs, membrane switches, silver/conductive ink printing, IMD/IML components, and functional insulation materials. The standard specification is 50μm × 1020mm × 200m, with customizable thicknesses available.

By delivering high adhesion, high insulation, and top-tier dimensional stability, HT10 offers a reliable, premium material solution that empowers electronic manufacturers to lower production losses and boost manufacturing competitiveness.