Flame retardant epoxy-glass circuit boards are made using brominated epoxies,with the bromine atoms providing the flame retardancy.In a fire,these boards can give off toxic gases.Bromine free epoxies can be used,with other additives being used to provide flame retardancy.These are most used by consumers with flammability environmental concerns.Many Japanese consumers demand this.Some suppliers are Hitachi,Mitsui,Nelco,Polyclad.I recommend an article by Martin Valfridsson in the November 2000 issue of CircuiTree,or contact Martin at martin.valfridsson@era.ericsson.se
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