Rigid PCB With HASL

A standard rigid printed circuit board on FR-4 substrate with Hot Air Solder Leveling (HASL) finish, the most common surface treatment in volume PCB manufacturing. Tin-lead or lead-free solder is applied to the exposed copper pads and leveled with hot air, leaving a uniform solderable surface that holds up well in long shelf storage and in subsequent reflow or wave soldering. HASL gives strong solder joint formation at low cost and is preferred for through-hole and mixed-technology assemblies where pad flatness is not the primary constraint. Copper traces laminated onto the rigid substrate carry signals between components, and the board is suitable for general-purpose electronics where reliability and unit price matter more than fine-pitch SMT. Typical uses include consumer electronics, industrial control panels, IoT devices, lighting boards, and instrumentation.