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Purpose of prepeg and core

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srilu

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prepeg

In PCB manufacturing
I know that core (laminate..FR4 etc.,) acts as insulator b/w two copper foils.
But what is pre-peg and what is its purpose ?

regards,
Srilu
 

prepeg pcb

Prepreg is a non-cured glass/epoxy sheet that acts as the glue during multilayer lamination - a simplified example is that the epoxy between the copper sheets in a piece of core material is cured prepreg.

SiGiNT
 

pre peg

Core is the dielectric material between two copper layers which forms a Laminate, & prepreg is the dielectric material which is used to bond thes laminates
 
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    snaku

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prepeg in pcb

FYI:

You cannot call the laminate as insulator. It has dielectric constant and provides capacitance by which return current to pass from signal to gnd.
 
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