The maximum total halogens contained in the resin plus reinforcement matrix is 1 500 ppm with a maximum chlorine of 900 ppm and maximum bromine being 900 ppm.
上面一段话来自IEC 61249-2-21,即氯元素最大不超过900 ppm,溴元素最大不超过900 ppm,这两种卤素之和不超过1500 ppm,以后所有文件及规范中的Halogen-free均参考这一定义.
具体可以去看我在RoHS/WEEE版的置顶帖里面的无卤资料总结.