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The commonly used PCB NEMA substrate grade classification:

According to different TG values, it can also be classified:

TG means Glass Transition Temperature. The higher the TG, the better the temperature resistance of the material.

Ordinary TG : 130 ℃ or more

Medium TG : about greater than 150 ℃

Advanced TG : generally greater than 170 ℃

FR-4 PCB is widely used in different industries:



-Industrial instrumentation


-Consumer electronic


Fr-4 PCB Capabilities

Board Layers: 1-20layers

Board Thickness: 0.1-4mm+_10%

Fr4 Board thickness: 1.34 thou to 3 in

Copper thickness: 1-12oz

Minimum trace: 3mil

Minimum vias: 0.015mm

Tolerance of PCB: 士5%

PCB Outline: Square,circle, irregular

Min Line/Space: 0.075/ 0.075mm

Suface Finish:HASL,HASL lead free, Immersion gold(ENIG), Immersion tin, Immersion silver, OSP

Solder Mask Color:Green/Black /Blue/ Yellow / Red /White

Fr-4 PCB Samples

STG has the ability to provide you high quality and quick turn arround Fr-4 circuit board with low cost

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