HASL - Hot Air Solder Level

It is a molten solder immersion and hot air leveling or blasting of surfaces and holes to provide a "retained" coating on exposed copper surfaces.

The advantage of HASL is excellent solderability, because as its name implies "Nothing solders better than solder."  One of the less-expensive surfaces finished with a good shelf life.

However, the problem with this finish is its limitation and difficulty. A limited capability on high density boards and a capacity to clear vias holes on a greater than 6:1 aspect ratio. A difficulty to maintain hole size tolerance along plated edges and to process thin material.

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