What does FR signify in FR4 substrate?

What does FR signify in FR4 substrate?

 

FR4 is commonly used substrate for the PCB design. FR stands for Flame Retardant. There are several classes in FR which are differentiated by the number at the end.

FR1 to FR3 - It is Paper reinforced resin system

FR4 to FR5 - It is Glass Fabric reinforced resin system

This means substrates with FR4 and above are more resistant to the fire.

Post a Comment

0 Comments