re why circuit boards are green why are circuit boards green the material used to make them goes by two names if it is used to make circuit boards it is called fr the same material is used in the cryogenics industrya and marine industries as a structural material and is called g fr and g are both green they are not green because of a solder masking agent the basic ingredients are a clear epoxy resin and glass fibers i am not sure what the specs are on the resin but if you are really curious you can call nema national electronics manufacturing association or ciba geigy a major manufacturer of epoxy resins to find out as an aside i occasionally mix clear epoxy and glass microsphres to cast small structures for cryogenics experiments the proportions of glass to epoxy are about the same as in g they are the same green color
