ISO 26603:2017 pdf download – Plastics — Aromatic isocyanates for use in the production of polyurethanes — Determination of total chlorine. 3.4 total chlorine inorganic and organically bound chlorine present in isocyanates that is converted to titratable chlorides under the combustion conditions of the test 4 Principle In each test method, the organic matter in the sample is destroyed by combustion with oxygen, thus converting the organically combined chlorine to ionic chloride. The chloride is determined potentiometrically by titration with silver nitrate (AgNO 3 ) solution. 4.1 Test Method A Combustion of the sample is done in a pressurized oxygen...