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68 I-CONNECT007 MAGAZINE I MAY 2026 Rethinking Reinforcement Materials for Advanced Packaging Materials that once quietly sup- ported the industry are now be- coming limiting factors. The electronics industry is experiencing unprecedent- ed pressure as RF systems push into mmWave frequencies, high-speed digital architectures advance into their next performance generation, and power densities climb across automotive, telecom, aerospace, and computing. Reinforcement materials, long treated as a background detail in laminate design, are suddenly at the centre of per- formance, reliability, and supply chain discussions. For decades, glass fiber has been the default re- BY I VA N A I VA N OV I C, F L E X I R A M I C S inforcement platform for substrates and laminates. It is familiar, available, and deeply integrated into manufacturing. But the demands placed on electronics are no longer aligned with the proper- ties of glass. Thermal bottlenecks, fre- quency-dependent loss, dielectric vari- ability, and supply chain fragility are forcing engineers and material suppliers to reconsid- er what reinforcement should be, and what it must enable. This article explores why reinforcement materials are under scrutiny, how thermal and frequency chal- lenges are reshaping substrate design, and why the industry should evaluate new reinforcement plat- forms, including flexible ceramic nonwovens, as a path forward for next-generation electronics. Reinforcement as a Performance Driver When engineers think about improving signal in- tegrity or thermal performance, they often focus on resin chemistry, copper roughness, or stackup design. Reinforcement rarely gets top billing, yet reinforcement fibers influence nearly every critical property of a laminate, such as dielectric constant and loss, thermal conductivity and heat spreading, mechanical stability, dimensional control, manufac- turability, and yield. Glass fiber has supported the industry for de- cades, but RF/mmWave and high-speed digital sys- tems are pushing materials into new performance regimes. As frequencies rise and thermal densities increase, reinforcement becomes an active design parameter rather than a background choice. This is why the industry is exploring new materials. Ivana Ivanovic Click here to read the full article