Prepregs, cores, foils

A prepreg (from pre-impregnated) is fibreglass impregnated with resin. The resin is pre-dried, but not hardened, so that when it is heated, it flows, sticks, and is completely immersed. Prepregs are thus fibreglass strengthened by an adhesive layer (similar to FR4 material). The name of each prepregs derives from the type of fibreglass used. 

Prepregs and cores are also available in High-Tg and halogen-free types, but not always in every possible thickness.

Prepregs

We have the following FR4 prepregs in stock:

Type Typical thickness
Type1080Typical thicknessapprox. 78µm
Type2116Typical thicknessapprox. 120µm
Type7628Typical thicknessapprox. 180µm

The following FR4 prepregs are partially in stock, or are available for order:

Type Typical thickness
Type106Typical thicknessapprox. 60µm
Type2125Typical thicknessapprox. 100µm
Type2165Typical thicknessapprox. 125µm

Cores

Circuit boards cores are pre-pressed layers according to the pattern: copper foil – prepreg – copper foil. Multi-CB also manufactures printed circuit boards with metal core.

Multi-CB normally has the following circuit boards cores in stock*:

Thickness Copper thickness
Thickness50µmCopper thickness18µm/18µm;
Thickness100µmCopper thickness18µm/18µm; 35µm/35µm
Thickness150µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness200µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness300µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm;
Thickness350µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm; 210µm/210µm
Thickness400µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm; 210µm/210µm
Thickness500µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm; 210µm/210µm
Thickness550µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm; 210µm/210µm
Thickness600µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm;
Thickness700µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm;
Thickness800µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm; 140µm/140µm;
Thickness900mmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness1000µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness1200µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness1500µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness2000µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness2400µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;
Thickness3200µmCopper thickness18µm/18µm; 35µm/35µm; 70µm/70µm; 105µm/105µm;

*Special cores may also be pressed for a particular project.

Copper foils

The copper for the outer layers of multilayer boards is applied in the form of copper foil and pressed together with the prepregs / cores. For use with microvias, the copper foil is replaced by RCC foil (Resin Coated Copper).

We have copper foil in the following thicknesses in stock:

12µm18µm35µm70µm105µm210µm

The following FR4 prepregs are partially in stock, or are available for order:

65µm80µm100µm