In a multilayer PCB, prepregs (pre-impregnated materials) are composed of glass fiber impregnated with resin. They provide electrical insulation and bonding between the different circuit layers during the lamination process.
However, not all prepregs are the same. The balance between resin and glass fiber directly impacts PCB construction.
A higher resin content can improve filling around copper features and enhance interlayer adhesion. A higher proportion of glass fiber provides greater mechanical rigidity and dimensional stability.
The IPC-4101 standard helps identify material characteristics and enables better control over PCB construction.
This is why obtaining the PCB stack-up is important to understand which prepregs are used and their properties. A detail that is sometimes underestimated, but one that can make a real difference in the final product’s quality and reliability.
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