PCB Material Composition

Views:25     Author:Site Editor     Publish Time: 2020-08-03      Origin:Site

PCB generally consists of four layers, which are heat laminated together into a single layer. The material used in PCB from top to bottom includes Silkscreen, Soldermask, Copper and Substrate.

The massively-used copper clad laminate (CCL) can be classified into different categories according to different classification standards including reinforcing material, used resin adhesive, flammability, CCL performance. The brief classification of CCL is shown in the following table.

Table: Classification of CCL

Classification Standard

Material

Reinforcing Material

Paper base class

PF resin (XPC, FR1, FR2)

Epoxy resin (FE-3)

Polyester resin

Glass fiber cloth base class

Epoxy resin (FR4, FR5)

Composite epoxy material (CEM)

nil

Lamination multilayer base class

nil

Special material base class

BT, PI, PPO, MS

Flammability

Flame-proof type

UL94-VO, UL94-V1

Non-flameproof type

UL-94-HB


CCL with ordinary performance

nil


CCL with low dielectric constant

nil

CCL Performance

CCL with high heat resistance

nil


CCL with low coefficient of thermal expansion

nil

 

Above the green solder-mask is the silkscreen layer, which adds letters and numerical indicators that make a PCB readable to tech programmers. This, in turn, makes it easier for electronics assemblers to place each PCB in the proper place and in the right direction on each component. The silkscreen layer is usually white, though colors such as red, yellow, gray and black are also sometimes used.

 


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