FR-4 Alert
FR-4 Alert ?Did you know that:The FR in FR-4 stands for "flame retardant". It refers to its ability to self-extinguish after a fire. ?FR-4 is a composite material made of glass fibers surrounding an epoxy resin ?FR-4 is not the material name, but a collective term for a variety of laminates with different properties. ?FR-4 was defined in the 1960s...