PCB Glue: Adhesive Types and Selection Guide for 2026
A 2026 engineering guide to PCB adhesives, including epoxy, silicone, acrylic, UV-cure materials, underfill, staking, curing, compatibility, inspection and rework.
PCB Knowledge
Practical explanations of PCB design, fabrication, assembly and testing.
70 articles · Page 4 of 4
PCB Copper Weight: 1 oz, 2 oz and Heavy Copper Explained
Understand PCB copper weight, nominal thickness, base versus finished copper, current and thermal effects, and how to specify 1 oz, 2 oz or heavy copper correctly.
Ceramic PCB Substrates: Alumina, Aluminum Nitride and Design Guide
Compare alumina and aluminum nitride ceramic PCB substrates, metallization options, thermal behavior, design constraints, applications and supplier questions.
ENIG vs. Hard Gold: PCB Surface Finish Selection Guide
Compare ENIG and electroplated hard gold for solderability, contact wear, edge fingers, thickness, cost and PCB fabrication requirements.
PCB Drill Sizes: Finished Holes, Tool Sizes and Tolerances
Learn how PCB drill sizes are specified, why plated and non-plated holes differ, how annular rings and tolerances interact, and what to include in fabrication data.
PCB Test Coupons: Types, Placement and Acceptance Testing
Understand what PCB test coupons verify, the difference between impedance and quality-conformance coupons, where they belong on a panel, and how to specify them.
Black PCB Guide: Solder Mask, Black FR-4 and Design Tradeoffs
Compare black solder mask with black-core FR-4, understand visual and inspection tradeoffs, and prepare manufacturing data for a reliable black PCB build.
PCB Glass Transition Temperature (Tg): A Practical Guide
Learn what PCB glass transition temperature means, how Tg differs from Td, why repeated thermal cycles matter, and how to choose an appropriate laminate.
PCB Panelization Guide: V-Scoring, Tabs, Rails and DFM
Understand PCB panelization methods, breakaway tabs, V-scoring, tooling rails, fiducials, spacing, depanelization risks, and the data your manufacturer needs.
PCB Counterbore vs. Countersink Holes: Design Guide
Compare PCB counterbore and countersink holes, understand the required dimensions, and avoid mechanical, copper-clearance, thickness, and fabrication problems.