Solder Mask vs PCB Solder Resist: Understanding the Differences

When it comes to printed circuit board (PCB) manufacturing, two terms often come up in the conversation surrounding surface protection and design integrity: solder mask and solder resist. At first glance, they may seem interchangeable—and in many contexts, they are. However, understanding their roles, differences, and applications can help engineers, designers, and manufacturers make better-informed decisions, especially in high-precision or high-reliability PCB builds. In this article, we’ll explore the similarities and differences between solder mask and solder resist, clarify common misconceptions, and explain why these protective coatings are essential for modern PCB production—particularly in the UK’s advanced electronics and manufacturing sectors. What Is a Solder Mask? A solder mask is a protective polymer coating applied to the surface of a PCB. It covers the non-solderable areas of the board, leaving only the pads and vias exposed where components will be soldered...