ISO 120:1977
Plastics; Phenol-formaldehyde mouldings; Determination of free ammonia and ammonium compounds; Colorimetric comparison method

Standard No.

ISO 120:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Latest

ISO 120:1977

Scope

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.

ISO 120:1977 history

• 1977 ISO 120:1977 Plastics; Phenol-formaldehyde mouldings; Determination of free ammonia and ammonium compounds; Colorimetric comparison method