Ventec International Group – Pesh Patel: VP of Sales & Technology

Advancing PCB Excellence Through Ventec’s pro-bond & thermal-bond Dielectric Solutions

Modern electronics continue their march toward increased sophistication, demanding unprecedented levels of performance from ever-smaller packages. Within this landscape, the materials forming printed circuit boards have become decisive factors in system success. Conventional glass-reinforced prepregs and standard dielectric materials – though proven over decades of PCB manufacturing – now struggle to satisfy contemporary requirements for signal fidelity, minimal transmission losses, and effective heat dissipation.

Ventec addresses these limitations through its pro-bond and thermal-bond bondply dielectric families, purpose-built solutions for demanding multilayer PCB architectures. These materials serve critical applications spanning artificial intelligence computing platforms, data transmission infrastructure, advanced telecommunications, automotive electronics systems, and aerospace equipment.

Understanding the Technology

Both pro-bond and thermal-bond belong to the category of unreinforced bondply materials, manufactured in two primary formats: Resin Coated Copper (RCC) and Resin Coated Film (RCF). Their distinguishing characteristic lies in the absence of glass reinforcement, which eliminates microscopic dielectric constant fluctuations that compromise signal integrity, particularly in high-frequency circuits and ultra-fine feature geometries.

RCC Bondply Configuration – Features unreinforced adhesive applied to ultra-thin copper foil ranging from 1.5 to 5.0μm, supported by an 18μm carrier structure. This construction proves ideal for ultra-high-density multilayer PCB designs.

RCF Bondply Configuration – Incorporates unreinforced adhesive coated onto PET film substrate, providing enhanced design versatility in high-performance multilayer constructions where precision dielectric control and fine-line capabilities are paramount.

pro-bond: Optimized for Speed and Minimal Loss

The pro-bond material family targets high-speed digital (HSD) and high-frequency (HF) circuit applications. Available dielectric constants span 2.8 to 3.05, while dissipation factors range from 0.0007 to 0.0065, enabling optimization across diverse signal velocities and bandwidth specifications.

Applications benefiting from pro-bond technology include probe card assemblies, embedded integrated circuit substrates, interposer structures, chip packaging solutions, any-layer HDI configurations, high-performance computing motherboards, server backplane architectures, and cellular network power amplification systems. Throughout these applications, pro-bond maintains dielectric stability, delivering predictable signal transmission paths – a critical requirement for circuits operating beyond tens of gigahertz.

thermal-bond: Superior Heat Dissipation Capability

When thermal management becomes the dominant design challenge, thermal-bond provides exceptional thermal conductivity ratings of 3.2, 7.0, or 9.0 W/mK, combined with a maximum operating temperature (MOT) reaching 155°C. These characteristics make thermal-bond particularly suitable for motor drive electronics, high-power RF amplification circuits, embedded packaging architectures, thermal interface material (TIM) applications, and sophisticated multilayer insulated metal substrate (IMS) boards.

The absence of glass reinforcement – traditionally a significant thermal impediment—enables thermal-bond to establish direct thermal pathways from heat-producing components toward heat spreading elements, metal core structures, or chassis assemblies. This results in substantial performance improvements while preserving mechanical robustness.

The Significance of Glass Free Construction

Glass reinforcement introduces complications at elevated frequencies. Weave pattern variations generate microscopic dielectric constant inconsistencies that corrupt signal propagation and introduce timing differences between differential pair traces. In fine-line HDI layouts where trace geometries approach glass bundle dimensions, these variations intensify, producing unreliable performance.

Eliminating glass fiber from the construction delivers multiple advantages:

• Eliminates timing skew in high-frequency signal paths
• Enhances impedance consistency across the board surface
• Facilitates superior microvia formation without fiber interference
• Prevents CAF (Conductive Anodic Filament) degradation associated with glass-fiber pathways
• Circumvents supply chain constraints for low-Dk glass materials

Benefits for Equipment Manufacturers & PCB Fabricators

Electrical Characteristics

• Ultra-low dissipation factor minimizing insertion loss
• Stable dielectric constant enabling accurate impedance targeting
• Thin dielectric capability (reaching 10μm) supporting increased layer counts and tighter pitch geometries

Thermal Performance

• High watt-per-meter-kelvin conductivity facilitating efficient thermal distribution
• Compatibility with metal-core, ceramic, and glass substrate materials
• Elimination of glass fiber thermal resistance barriers

Manufacturing & Mechanical Properties

• Extensive flow range accommodating via filling and heavy copper gap management
• Tunable flow characteristics for diverse applications, including cavity bonding operations
• Robust adhesion to ceramics, metals, and unconventional substrate materials
• Outstanding thermal endurance – withstands 5 cycles at 288°C solder float testing
• Enhanced ductility compared to legacy bondply materials, improving processing reliability
• Flexible, operator-friendly material enabling easy liner separation
• Conventional cold storage requirements (eliminating frozen storage and thawing protocols)

Design Versatility

• Accommodates embedded and passive component integration
• Enables BGA footprint reduction in high-aspect-ratio designs
• Compatible with conductive adhesive systems for specialized interconnection schemes

Practical Applications and Results

Within high-speed networking infrastructure, pro-bond maintains signal integrity for 56–112 Gbps transmission across extended backplane lengths without requiring expensive signal conditioning components. For AI computing platforms, the combination of ultra-low loss characteristics and thin dielectric options enables dense interconnection strategies without excessive board thickness.

In electric vehicle power electronics and 5G base station amplifier modules, thermal-bond’s 9.0 W/mK thermal conductivity prevents thermal runaway conditions and prolongs component operational lifespan.

Summary

Ventec’s pro-bond and thermal-bond product families mark a significant advancement in PCB bondply material technology. Through glass free construction that unites electrical precision with outstanding thermal management capabilities, these materials provide OEMs and manufacturers with the resources to develop faster, cooler, and more dependable electronic systems—without introducing manufacturing complications.

Whether the primary concern involves ultra-low-loss signal transmission, robust thermal dissipation, or bonding to challenging substrate materials, pro-bond and thermal-bond deliver performance where it’s most critical, powering the next wave of high-performance electronic innovation.

Original written by Pesh Patel, VP of Sales & Technology, Ventec International Group

©2025 Ventec International Group

Original Published September 2025 – I-Connect007 in PCB007 Magazine

https://iconnect007.uberflip.com/i/1539509-pcb007-sept2025/9?