单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级WET ETCH CLEAN ChemicalPage 1Page 2Differences between 49HF HF(50:1) DHF(100:1)The Etch rate: 49HF >HF(50:1)>DHF(100:1) on the same condition to the same material