Accurate Calculation of Raw Material Cost Increase for 4-Layer HASL PCBs – Empower PCB Procurement Teams with Negotiation & Cost Control Tools Since September 2025, suppliers of 4-layer HASL (Hot Air Solder Leveling) PCBs have been raising prices continuously. As a mainstream PCB product widely used in industrial control, automotive electronics, and consumer electronics, is the price hike rea...