DS DS/EN ISO 172
DS DSEN SO 172 1998-OCT-02 Plastcs - Phenol-formaldehyde mouldngs - Detecton of free ammona
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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.