ISO 1897-4:1977
工业用苯酚、邻甲酚、间甲酚、对甲酚、甲苯基酸和二甲苯酚 试验方法 第4部分:不溶于氢氧化钠溶液的杂质目视试验(甲苯基酸和二甲苯酚除外)
Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use; Methods of test; Part IV : Visual test for impurities insoluble in sodium hydroxide solution (Excluding cresylic acid and xylenols)