Prepreg

Prepreg, referred to as PP, it is a sheet material impregnated with resin and cured to an intermediate level (B-stage), known an insulating material for the PCB board.
As a prepreg material while the PCB production process, before lamination, it is mainly used as an adhesive material and insulating material for the inner conductive pattern of a multilayer PCB.

Detailed Introduction

Prepregs are reinforcement materials that have been pre-impregnated with either a thermoplastic or thermoset resin, hence the name prepreg. The resin impregnation process precisely controls the fiber to resin ratio and ply thickness. Thermoset prepregs are produced by saturating a fiber reinforcement with a liquid thermoset resin. Excess resin is removed from the reinforcement and the resin undergoes a partial curing, changing from a liquid to a pliable solid state. This is known as the “B-stage.” Prepregs in the B-stage require refrigerated storage conditions. The curing process is then activated with the application of heat.

Features

Thermoplastic prepregs are produced by coating fiber reinforcement with a thermoplastic matrix. An advantage to thermoplastic prepregs is the ability to reheat and reform the material multiple times by heating above the melting point of the specific thermoplastic matrix. Unlike thermoset prepregs, thermoplastic prepregs can be stored at room temperature. In this case, the thermoplastic prepreg is formed by heat and becomes solid when cooling to room temperature.

Scope of Application

Prepregs are used in: Aerospace, Defense / Ballistics, Marine, Transportation, Wind Energy / Power

Specification

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes and colors available upon request.

Guidelines for Proper Storage of Fiberglass Prepregs

Prepregs, often the base material for FR4 insulation boards, are a type of composite material formed by impregnating a reinforcement fabric, like fiberglass, with a resin system.

Why G10 Epoxy Boards Typically Use 7628 Glass Fiberglass Cloth Prepregs

In the production of G10 epoxy boards, one of the essential materials employed is the 7628 glass fiberglass cloth prepregs. The choice of this specific prepreg type is not random but is influenced by its distinct characteristics that align with the required properties of G10 epoxy boards.

Understanding the Role of Fiberglass Prepregs in Composite Material Production

Many composite materials are indeed made from fiberglass prepregs. Prepreg is short for “pre-impregnated,” and refers to the process where the fibrous reinforcement, in this case, fiberglass, is pre-impregnated with a resin system.