PROCESS

Surface finish
A surface finish is essential for making a reliable connection between the PCB and the electronic component. A surface finish has two major functions, to provide a solderable surface for sufficient soldering components to the PCB, and to protect any exposed copper from oxidizing.
Modern surface finishes are lead-free, in accordance with Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) directives, and include:
• Immersion Gold
• Immersion Silver
• Immersion Tin
• Gold Finger
• Lead Free HASL
• OSP
• Flash Gold
Also, AngelPCB good at making a special process PCB, such as:
• High Density PCB
• HDI PCB
• Heavy Copper PCB
• Impedance Control PCB
• Rigid Flex PCB
• Buried & Blind Via PCB and more