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HASL Enig OSP Immersion Gold Tin Coating Surface Finish Custom PCB Circuit Boards Manufacturer. 20-Year Manufacturer Experience: Over 17 years of PCB experience with hundreds of global customers. Comprehensive Surface Finishes: Offers HASL, Enig, OSP, ENEPIG, Immersion Gold, Tin, and Gold Plating options. Wide Size Range: Mini board size 8*8mm up to Max 650*610mm with thickness 0.3mm-3.5mm. OEM and ODM Services: Full customization from samples, designs, and flexible minor customization available. Multiple Material Options: Uses FR4, Rogers, Arlon, Alum base, and Cu base materials. Strict Quality Control: 100% inspection including visual and function checks by 10 QA inspectors.