SG是特定级，specific grade的缩写，化学试剂分为以下几种：MG(Medical grade)医药级，FA(food additives)食品添加剂，GR(guaranteed reagent)优级纯，AR(analytical reagent)分析纯，CP(chemical regent)化学纯，IND(indicators)指示剂，PT(primary reagent)基准试剂，BR(biological reagent)生物试剂，LR(laboratory reagent)实验试剂，SG(specific grade)特定级，EP(extra purity)超纯，BS(biological stains)生物染色剂。至于具体的纯度和杂质限量是怎么要求的我就不清楚了
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