Solder Coating

HASL (Hot Air Solder Leveling) is a widely used, cost-effective PCB surface finish that protects copper pads from oxidation and ensures reliable solderability for industrial and commercial electronics assembly. What Is Hot Air Solder Leveling (HASL)? Hot Air Solder Leveling (HASL) is a mature and industry-standard PCB surface finish applied to exposed copper circuits. It…

HASL (Hot Air Solder Leveling) is one of the most widely used and cost‑effective PCB surface finish processes in electronics manufacturing. It provides excellent solderability, protects copper from oxidation, and supports reliable assembly for through‑hole and standard SMT applications. This guide explains the HASL process, benefits, limitations, lead‑free options, and comparisons to help you select…