Ссылочный номер
ISO 1897-9:1977
© ISO 2024
ISO 1897-9:1977
Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use — Methods of test — Part 9: Determination of m-cresol content (Cresylic acid only)
Версия 1
1977-04
В время отменен
Отозвано (Версия 1, 1977)

Тезис

The method is applicable to a product containing 35 % (m/m) to 60 % (m/m) of m-cresol, not more than 5 % (m/m) of phenol, and not more than 35 % (m/m) of o-cresol. The principle is based on dehydration of a quantity of the test sample. Formation of a complex between m-cresol and urea by addition of excess urea to a test portion of the dehydrated sample. Determination of the crystallizing point of the complex in a crystallizing point apparatus. Calculation of the content from the water content of the test sample and the crystallizing point of the complex. The relation between crystallizing point and m-cresol content of m-cresol/urea mixtures is given in a table. ISO 1897/9 replaces ISO Recommendation R 1911-1971.

Общая информация

  • Текущий статус
     : Отозвано
    Дата публикации
     : 1977-04
    Этап
    : Отмена международного стандарта [95.99]
  • Версия
     : 1
  • Технический комитет :
    ISO/TC 47
    ICS :
    71.080.40 
  • RSS обновления

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  2. Интернет-магазин
  3. Каталог стандартов
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  5. 71
  6. 71.080
  7. 71.080.40
  8. ISO 1897-9:1977