https://blog.pcbrfq.com/tags/engineering/Recent content in Engineering on PCB RFQ BlogHugo -- gohugo.ioen-us© 2026Tue, 19 May 2026 00:00:00 +0000https://blog.pcbrfq.com/posts/fr4-high-tg-cross-linking/Tue, 19 May 2026 00:00:00 +0000https://blog.pcbrfq.com/posts/fr4-high-tg-cross-linking/<p>When buyers specify FR4 High-Tg on an RFQ, they often do so because a datasheet or engineer told them to. Fewer understand <em>why</em> it behaves differently from standard FR4 — and why that difference matters when a board heats up under load, goes through lead-free soldering, or operates in a demanding environment.</p> <p>The answer lies not in the glass fibres or mineral fillers, but in the epoxy resin chemistry itself.</p>