Multi-layer pcb

Multilayer PCB consist of 3 or more circuit layers bonded together by a thickness of insulating material called prepreg and core. Multilayer printed circuit boards are most complicated than others, and are generally considered to be the most sophisticated PCB product due to their construction methods and design complexities.
These are a few of the applications using multilayer printed circuit boards:
● Communications
● Industrial controls
● GPS technology
● Aerospace
● Computers
● Military
● Medical
● Satellite systems
General specification for Multi-layer printed circuit board
1, 4-38 layers
2, Board finished thickness: 0.3mm-7.0mm
3, Material: FR-4, CEM-1, CEM-3, High TG, FR4 halogen Free, Rogers, Telfon.
4, Max. Finished board size: 2325(580900mm)
5, Min. Drilled hole size: 6mil(0.15mm)
6, Min. Line width: 3mil(0.075mm), Min. Line spacing: 3mil(0.075mm)
7, Surface finish/treatment: HASL/HASL lead free, Chemical tin, ENIG,Immersion Silver, OSP, etc.
8, Copper thickness: 0.5-20 oz
9, Solder mask color: Green/yellow/black/white/red/blue
10, Copper thickness in hole: >25.0 um(>1mil)

1. 4 layers Semi hole multilayer printed circuit board

   4Lsemi hole multilayer pcb
   Technical description,
   Material: FR-4 Tg150 Halogen free
   Board thickness: 0.8mm
   Surface finished: Immersion gold
   Copper thickness: 1 Oz for all layers
   Solder mask: TaiYo blue
   Min through hole: 0.2mm
   Consumer Electronics

2. 4 layers 94V-0 multilayer printed circuit board

   4L PCB
   Technical description,
   Material: FR-4 Tg170
   Board thickness: 1.60mm
   Surface finished: Immersion gold
   Copper thickness: 1 Oz for all layers
   Solder mask: TaiYo Green
   Min through hole: 0.2mm

3. 4 layers Meter PCB

   4L PCB
   Technical description,
   Material: FR-4 Tg135
   Board thickness: 1.60mm
   Surface finished: HASL LF
   Copper thickness: 1/1/1/1 oz
   Solder mask: Green
   Min Line Width/Spacing:0.127mm/0.127mm

4. 4 Layers FR4 Tg170℃ Halogen free 94V-0 PCB

   4L multilayer printed circuit board
   Technical description,
   Material: FR4 Tg170℃ Halogen free
   Board thickness: 1.58mm
   Surface finished: Immersion gold
   Copper thickness: 1 Oz for all layers
   IPC class 3

5. 6L Power supply printed circuit board

   6L multilayer printed circuit board
   Technical description,
   Material: FR4 Tg135℃
   Board thickness: 1.58mm
   Surface finished: HASL
   Copper thickness: 1 Oz for all layers
   Unit size/mm: 160*234mm

6.6L prototypes Multilayer PCB board
6L multilayer printed circuit board
Technical description,
Material: FR4 Tg170℃
Board thickness: 1.58mm
Surface finished: ENEPIG