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4-layer board

Number of floors: 4
Plate thickness: 1.6mm
Surface treatment: Immersion Gold
Material Science: TG150
Minimum aperture: 0.40mm
Aspect ratio: 4:1
Copper hole: 25um
Copper thickness: inner layer 1oz, outer layer 1oz
Minimum line width: 8mil
Other instructions: Ion pollution level ≤ 0.75ug Eq NaCl/cm.sq

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