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Flash Gold PCB
Flash gold  was one of most famous surface finish on PCB in the past, it is repalced by immersion
Gold (also called ENIG or softe gold) because of appreciation of gold. The gold thickness by flash good will be thicker
than immersion gold, and now, flash gold is only used in special places like gold fingers.
4 Layer pcbs
FR4 Material
1.50mm Board Thickness
1OZ finish Copper
Flash Gold Surface Finish
4/4mil track/space
0.25mm hole size
Green Solder Mask
2 Layer PCBS
FR4 2.00 Board Thickness
1 OZ finish copper
Flash Gold Surface Treatment
Min Track/Line 8mil
Min Hole Size 0.50mm
Complicated Routing