PCB Etching Reality — Why Copper Thickness Defines Minimum Track and Spacing

Tue, 26 May 2026 00:00:00 +0000

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
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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.

PTFE Is Not a Flex Material — Physical Form, Elasticity, and What You Cannot Do With It

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

One of the most persistent misconceptions about PTFE-based PCB laminates comes from handling the material. Pick up a sheet of Rogers RO4350B or RT/duroid 5880 and compare it to a sheet of standard FR4. The PTFE laminate feels different — slightly softer, with a quality that engineers sometimes describe as rubbery or compliant. Bend it gently and it flexes slightly before springing back.

This tactile impression leads directly to a dangerous assumption: that PTFE can be used in flexible PCB applications, or treated with more mechanical freedom than a rigid board.

PCB Manufacturing on PCB RFQ Blog

PCB Etching Reality — Why Copper Thickness Defines Minimum Track and Spacing

How Etching Works — Downward and Sideways #

PTFE Is Not a Flex Material — Physical Form, Elasticity, and What You Cannot Do With It

How Etching Works — Downward and Sideways
#