ISO NTERNATIONAL STANDARD 172 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAH OPTAHW3AUMA HO CTAHAAPTW3ALMM-ORGANISATION INTERNATIONALE DE NORMALISATION Plastics -- Phenol-formaldehyde mouldings - Detection of free ammonia Plastiques -- Pieces moulees a base de phenoplastes -- Recherche de la présence d'ammoniac libre First edition - 1978-08-15 172-1978 (E) UDC 678.632'32'21 : 678.067 : 543.813 Ref.No. ISO 172-1978 (E) Descriptors : plastics, castings, phenoplasts, detection, ammonia (gas). x Standardization nse with ISC Not for Resale Price based on 1 page FOREWORD IsO (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing International Standards is carried out through Iso technical committees.Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with iso, also take part in the work. DraftInternational Standards adoptedbythetechnical committeesarecirculated to the member bodies for approval before their acceptance as International Standards by the Iso Council. International StandardISO 172 wasdeveloped by Technical Committee ISO/TC 61,Plastics. It was submitted directly to the Iso Council, in accordance with clause 6.13.1 of the Directives for the technical work of Iso. It cancels and replaces ISO Recommendation R 172-1961, which had been approved by the member bodies of the following countries : Australia India Spain Austria Israel Sweden Belgium Italy Switzerland Bulgaria Japan Turkey Czechoslovakia Netherlands United Kingdom France Poland U.S.A. Germany Portugal U.S.S.R. Hungary Romania No member body had expressed disapproval of the document. ?International OrganizationforStandardization,1978 Printed in Switzerland No reproduction or networking pemitted without license from IHS Not for Resale ISO 172-1978 (E) INTERNATIONAL STANDARD Plastics -- Phenol-formaldehyde mouldings -- Detection of free ammonia 1 SCOPEANDFIELDOFAPPLICATION 5 PROCEDURE This International Standard specifies a qualitative method Weigh a test portion of approximately 1 g of the test of detecting the presence of free ammonia or other volatile sample (clause 4) and, without delay, place it in the flask bases inphenol-formaldehydemouldingsbythe exposure (3.3). Quickly stopper the flask, placing a strip of universal ofanindicatorpapertothevapourfromapowdered indicator paper (3.4), moistened with distilled water, sample.Itmaybeusedwhentheabsenceoffreeammonia between the stopper and the flask so that the end of the is a requirement. paper projects into the flask. Take care that' the paper does not come into contact with the test portion. 2 PRINCIPLE After 30 min, examine the colour of the indicator paper Detection of alkaline vapours from apowdered testportion, and note any change. contained in a sealed flask, by means of universal indicator paper. 6 EXPRESSIONOFRESULTS If the indicator paper does not change colour, report 3 APPARATUS that the moulding does not contain free ammonia or other volatile bases. 3.1 Means for reducing the mouldings to a powder. If the indicator paper changes colour, indicating the presence of alkaline vapours, report that the moulding 3.2 Balance, accurate to 0,01 g. contains free ammonia or other volatile bases. 3.3 Glass-stoppered flask, capacity 50 ml. 7 TESTREPORT 3.4 Universal indicator test paper, pH range 1,0 to 11,0. The test report shall include the following particulars : a) reference to this International Standard; b) full details necessary for the identification of the 4 PREPARATION OF TEST SAMPLE sample; Reduce a fully representative sample of the mouldings to c) the method used for reducing the mouldings to powder by filing, miling, grinding, turning or drilling, powder; taking care that no undue heating of the material occurs. The prepared sam