coating layers

Fundamentals of PCB

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Fundamentals of PCB

1. Structure of PCB 1.1. Composition and Concept of PCB 1.2. Internal Structure of PCB 1.3. Commonly Confused Concepts of PCB 2. Concept of Layers 2.1. Classification of Layers 2.2. Common Layer Classifications 3. Components and Packaging 3.1. Component Symbols and Packaging 3.2. Pad Size 4. Introduction to PCB Processes 4.1. Overview of Processes 4.2. … Read more

Unit 3: Voids in Coating Layers Inside PCB Holes

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Unit 3: Voids in Coating Layers Inside PCB Holes

During visual inspection (non-sectioning), voids in the copper layer and coating layer of the hole (void) are common defects. Voids identified during visual inspection refer to areas exposing the substrate material, while voids identified through section analysis refer to areas below the minimum thickness specification, indicating a fundamental difference between the two. Different grades of … Read more