Active standard | Published: 01/10/1977

ISO 120:1977

Plastics — Phenol-formaldehyde mouldings — Determination of free ammonia and ammonium compounds — Colorimetric comparison method
(Plastiques — Pieces moulées a base de phénoplastes — Dosage de l´ammoniac libre et des composés ammoniacaux — Méthode par comparaison colorimétrique)

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Detail information

Designation: ISO 120:1977

Publication date: 01/10/1977

Pages: 2

Country: International technical standard

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Anotation

Description / 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.

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