Product Model: 20-Layer High-Speed Circuit Board Base Material: TUC TU872LK high-performance substrate Layer Structure: 20-layer multilayer design Finished Board Thickness: 5.0 mm Copper Weight: 1 oz for inner and outer layers Solder Mask & Silkscreen: Green solder mask with white silkscreen Minimum Line Width / Spacing: 4 mil / 4 mil Surface Finish: Hard gold plating, gold thickness: 3–15μ" Blind Via Structure: L3–L20 blind vias Application Field: Communication backplane PCB