layers: 12 layers/14 layers
Material: High-frequency material TU872SLK
Board thickness: 2.6mm/4.5mm
Copper thickness: / (not specified)
Surface finished: ENIG Nickel-Palladium-Gold
Outer layer trace width/spacing: 100/100mil or 6/6mi
Minimum hole diameter: 0.4mm
Solder mask and legend color: Green background with white 

high-reliability aerospace PCB circuit board is one of the series of high-layer PCB boards developed and produced 

by Shenzhen Huashengxin Precision Circuit Co., Ltd. 

It is manufactured using Taiyao TU872SLK material and surface immersion gold plating and other processes. 

This circuit board is widely used in the aerospace industry.