International Standard
ISO 120:1977
Plastics — Phenol-formaldehyde mouldings — Determination of free ammonia and ammonium compounds — Colorimetric comparison method
Reference number
ISO 120:1977
Edition 1
1977-10
© ISO 2024
International Standard
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Published (Edition 1, 1977)
This standard was last reviewed and confirmed in 2020. Therefore this version remains current.

ISO 120:1977

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CHF 42
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Abstract

Specification of a semi-quantitative method. The content of free ammonia in a moulded article is of importance, when corrosion of metal inserts or contamination in contact with the article has to be considered. Distillation of the aqueous extract from a powdered test portion, coloration of the distillate by reaction with Nessler reagent and comparison of the colour with that of standard matching solutions.

General information

  • Status
     : Published
    Publication date
     : 1977-10
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 2
  • Technical Committee :
    ISO/TC 61/SC 12
    ICS :
    83.080.10 
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