PCB RFQ Blog

When engineers search for standard FR4 thicknesses, they usually expect a simple answer. Instead, they often encounter conflicting information. One source lists a 0.10 mm core. Another shows 0.136 mm. A third refers to a 1080 prepreg with a thickness of 0.075 mm, while a supplier datasheet lists an entirely different value. The confusion arises because several different concepts are being mixed together: Core thickness Finished core thickness Prepreg thickness Pressed dielectric thickness Glass style Resin content Lamination behaviour All of these values are related, but they are not the same thing.

A precise quotation for a printed circuit board is not created simply by uploading layout data. It emerges from the interplay of complete manufacturing data, unambiguous technical specifications and a structured request for quotation. This is exactly where AI can make an important contribution — not as a replacement for the CAM engineer, but as an intelligent assistant at data intake. It can check data packages, evaluate documents, surface contradictions and prepare a clean foundation for an RFQ.

Etching defines what your PCB layout can and cannot achieve. Understanding the relationship between copper thickness, trace width, and spacing is not optional — it directly affects what your board costs and who can make it. How Etching Works — Downward and Sideways # The etchant does not only remove copper downward. It simultaneously attacks laterally — inward beneath the etch resist at the edges of every copper structure. This lateral attack is called undercut. The etch medium itself can be alkaline or acidic depending on the process — both attack copper selectively through the use of photo and metal resists as protective layers.

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:

Flex PCB specifications are among the most frequently underspecified documents in electronics procurement. Buyers write “flex PCB, polyimide base” and assume the supplier will fill in the rest correctly. Sometimes they do. Often they do not — and the failure mode is a board that cracks, delaminates, or develops intermittent opens after a few thousand flex cycles. Understanding why polyimide behaves the way it does, and why the protective layer choices matter as much as the base material, is the foundation of a correct flex PCB specification.