Monthly Archives: February 2025

Feb27
What Is Solder Mask (S/M)? What Is Its Purpose on a PCB? Why Is It Usually Green?

post on February 27, 2025

In discussions about printed circuit boards (PCBs), you’ll often hear the term Solder Mask (S/M). But what exactly is a solder mask, and what role does it play in a PCB? Some also refer to it as solder resist. What … Continue reading →

Design, PCB/FPC/PTF, SMT, Soldering     WorkingBear    Views (5,550)     comment (0)
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Feb20
PCB Popcorn Effect: Why it Happens and How to Stop It

post on February 20, 2025

The main reasons for PCB delamination or “popcorning” are primarily (1) moisture absorption and (2) excessive α2/Z-axis CTE (Coefficient of Thermal Expansion). Among these, moisture absorption is responsible for about 70% of delamination issues. Other factors, such as uneven thermal … Continue reading →

PCB/FPC/PTF, Quality, SMT     WorkingBear    Views (5,578)     comment (0)
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Feb06
Causes of Solder Empty and Tombstoning in Small Chip of Resistors and Capacitors

post on February 6, 2025

Recently, some people have asked about issues with solder empty in small chip SMD components like resistors and capacitors. Even after thoroughly checking the reflow oven profile settings and confirming everything is correct, solder empty still frequently occur with these … Continue reading →

Process, Quality, SMT, Soldering     WorkingBear    Views (5,160)     comment (0)