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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