Multilayer Printed Circuit Board

//Multilayer Printed Circuit Board

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: 23*25(580*900mm)
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)

18 layers multilayers board from China pcb factory Hitechpcb

Technical description 18L multilayer board Technical description Material: FR-4 Tg180 Board thickness: 2.2mm Surface finished: Immersion gold+Controlled Impedance Copper thickness: 1 Oz for all layers Min.line width/space: 4mil Min through hole: 0.25mm Medical