This standard specifies a qualitative method of detecting the presence of free ammonia or other volatile bases in phenol-formaldehyde mouldings by the exposure of an indicator paper to the vapour from a powdered sample. It may be used when the absence of free ammonia is a requirement.
Number of pages: 8
Date of approval: 1998-10-02
EN ISO 172:1998 IDTISO 172:1978 IDT