Definition

HASL Pb Free (lead-free HASL) uses RoHS-compliant solder alloys, typically SAC (tin-silver-copper) instead of traditional tin-lead. The process is identical to standard HASL - dip in molten solder, level with hot air knives - but requires higher process temperatures (approximately 260°C vs 230°C for leaded). This increased thermal stress can affect laminate integrity on thinner boards or those with tight tolerance requirements. Lead-free HASL maintains the cost advantage of traditional HASL while meeting environmental regulations.