ISO 6796-1981 标准详情
- 标准号:ISO 6796-1981
- 中文标题:工业用聚乙二醇 羟值的测定 邻苯二甲酸酐酯化法
- 英文标题:Polyglycols for industrial use; Determination of hydroxyl number; Phthalic anhydride esterification method
- 标准类别:国际标准化组织标准ISO
- 发布日期:1981-09
The hydroxy groups present in a test portion are esterified with phthalic anhydride. The excess phthalic anhydrids is hydrolyzed and the phthalic acid formed is neutralized with standard volumetric sodium hydroxide solution. If the sample contains fr
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