PCB Material Selection for Environmental Conditions — Temperature, Humidity, and Beyond

Wed, 20 May 2026 00:00:00 +0000

Material selection for a PCB is rarely driven by electrical requirements alone. The operating environment — temperature, humidity, chemical exposure, thermal cycling — defines the boundary conditions within which the laminate must perform reliably over its service life. Choosing a material adequate for the bench but wrong for the field is one of the most consistent sources of premature failure in electronic assemblies.

The Four Laminate Families
#

For the purposes of environmental selection, the relevant laminate families are:

Why FR4 High-Tg Behaves Differently — The Chemistry Behind Cross-Linking

Tue, 19 May 2026 00:00:00 +0000

When buyers specify FR4 High-Tg on an RFQ, they often do so because a datasheet or engineer told them to. Fewer understand why 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.

The answer lies not in the glass fibres or mineral fillers, but in the epoxy resin chemistry itself.

FR4 on PCB RFQ Blog

PCB Material Selection for Environmental Conditions — Temperature, Humidity, and Beyond

The Four Laminate Families #

Why FR4 High-Tg Behaves Differently — The Chemistry Behind Cross-Linking

The Four Laminate Families
#