Which materials are best for ultra-long pcbs?
High-performance ultra-long PCBs prioritize high-Tg FR-4 (Tg > 170°C) and PTFE-based laminates to maintain a 95% registration accuracy across 1,500mm+ spans. Data from 2025 indicates that using heavy copper (3oz to 10oz) on these extended substrates reduces voltage drop by 1.2% per meter compared to standard wiring. Low-CTE (12-14 ppm/°C) glass-reinforced resins prevent the 0.05% …