Materials Innovation in PCBs: The Last Five Years Changed More Than Most Engineers Realize
Over the past five years, PCB materials have not simply improved — they’ve been redefined by performance pressure.
The industry often frames recent innovation as incremental: slightly lower Dk, slightly better thermal performance, slightly improved reliability. That narrative misses what’s actually happened.
The real shift is structural.
Material selection has moved from a secondary engineering decision to a strategic lever — one that determines cost structure, manufacturability, signal integrity, sustainability profile, and supply chain risk.
“Materials are no longer supporting the design — they are defining it.”
And most companies are still evaluating materials the way they did in 2019.
“If I had to summarize the biggest change in one sentence,” says Bruno Morel, CEO of ACI Materials, “materials are no longer supporting the design — they are defining it."
The Quiet Revolution: Materials Are Now System-Defining
Five years ago, many PCB designs were constrained primarily by layout and copper geometry. Today, materials are often the limiting factor.
Why?
Because the applications driving growth — AI accelerators, EV power electronics, 5G infrastructure, aerospace electrification — are forcing simultaneous gains in:
- Electrical performance
- Thermal management
- Reliability
- Sustainability
- Cost control
That combination didn't exist at that intensity before.
“This is no longer about optimizing one thing,” Bruno explains. “Engineers are being asked to improve electrical performance, lower cost, increase reliability, and simplify manufacturing — all at the same time.”
“Performance without manufacturability is not innovation — it’s cost.”
High-Speed Design Has Rewritten the Rules
The expansion of high-frequency and high-speed systems has fundamentally altered material expectations.
Designers are no longer satisfied with “low loss.” They require predictable low loss across production volumes. Dk (dielectric constant) stability and Df (dissipation factor) control are now procurement-level conversations.
But here’s the part many overlook:
Improving signal integrity is no longer just about chasing lower Df. It’s about stack-up architecture, copper interaction, resin behavior under thermal stress, and process yield.
“We see companies upgrading to specialty laminates without fully understanding how it impacts fabrication yield,” says Bruno. “Performance without manufacturability is not innovation — it’s cost.”
That perspective matters. Because material choices that look optimal in simulation can become expensive in production.
Thermal Management Is Now a First-Order Design Constraint
Power density has increased dramatically, especially in EV, industrial, and AI applications.
Five years ago, thermal management was often reactive. Today, it is foundational.
Filled resins, advanced substrates, thicker copper, and hybrid stacks are becoming more common. But thermal performance must be balanced with:
- CTE (coefficient of thermal expansion) compatibility
- Process complexity
- Long-term reliability
- Assembly behavior
“The industry is pushing higher thermal conductivity numbers,” Bruno notes, “but the real question is whether the entire system remains stable under stress over time.”
Datasheet improvements do not automatically translate to lifecycle durability.
“Customers don’t need more material options. They need integrated solutions that improve performance and simplify manufacturing.”
Reliability Expectations Have Quietly Intensified
Automotive, aerospace, and defense customers are pushing longer validation cycles and harsher test protocols.
CAF resistance, moisture resistance, and thermal cycling endurance are now baseline expectations.
What has changed most significantly is lifecycle thinking.
“Five years ago, qualification was about passing a test,” Bruno says. “Today, customers are asking whether the material will perform predictably 15 or 20 years from now.”
That shift requires deeper collaboration between material providers and application engineers.
Sustainability and Supply Chain: Now Strategic Variables
Halogen-free materials are becoming standard. ESG reporting is influencing procurement decisions. Domestic sourcing has gained weight post-pandemic.
Lead times and geopolitical concentration are now part of material selection discussions.
“We’re seeing customers qualify alternative material paths not just for performance redundancy, but for supply chain resilience,” Bruno explains. “That was not common five years ago.”
Material strategy now includes risk management.
ACI’s Evolution: From Ink Supplier to Integrated Solutions Partner
As the industry evolved, so did ACI.
Over the last five years, ACI Materials has transitioned from being perceived primarily as an ink supplier to operating as a solutions provider.
“That shift reflects what the market needs,” Bruno says. “Customers don’t need more material options. They need integrated solutions that improve performance and simplify manufacturing.”
Multilayer PCBs: Where Simplification Creates Advantage
One of the strongest growth areas we see is multilayer PCB applications where manufacturing simplification delivers measurable cost impact.
Reducing process steps.
Improving yield.
Enhancing conductivity without increasing silver content.
Supporting solderability instead of glue-based bonding.
“In multilayer designs especially, simplification is often more valuable than marginal performance gains,” Bruno explains. “If you can improve yield and reduce process complexity, that’s real economic value.”
A Differentiated Solderable Silver System
Many conductive ink approaches rely on adhesive bonding strategies.
ACI offers silver ink solutions paired with in-house silver solder paste — enabling true solderable performance.
“For customers who need a solder solution rather than a glue approach, we are uniquely positioned,” says Bruno. “Higher conductivity, stronger mechanical integrity, better long-term reliability — that combination matters.”
This integrated silver system approach is particularly relevant in high-performance and multilayer applications.
Application Engineering: A Strategic Layer
Material decisions today are more complex than they were five years ago.
To address that complexity, ACI has expanded its Application Engineering capabilities.
“We engage early in the design process,” Bruno explains. “We evaluate electrical, thermal, mechanical, and manufacturing constraints together. Optimizing one variable in isolation is where mistakes happen.”
One of the most common errors we see? Selecting materials based solely on conductivity or datasheet metrics without evaluating fabrication impact or lifecycle durability.
“Modern PCB material selection must be system-driven,” Bruno adds. “That’s where experience matters.”
“Modern PCB material selection must be system-driven. Optimizing one variable in isolation is where mistakes happen.”
Looking Ahead: The Next Five Years
The next wave of PCB material innovation will be driven by:
- AI hardware scaling
- Advanced packaging integration
- Higher power densities
- Sustainability regulation
- Domestic manufacturing initiatives
“We’re going to see tighter tolerances, more hybrid constructions, and greater integration between materials and process design,” Bruno predicts. “The companies that think holistically — not transactionally — will lead.”
The past five years reshaped PCB materials.
The next five will reward those who understand that materials are no longer components of the system.
They are strategic drivers of performance, cost, and competitive advantage.
At ACI Materials, we believe the future belongs to engineers and companies who treat materials not as commodities — but as engineered solutions.
To learn more about ACI Material’s PCB solution, visit our website at www.acimaterials.com
