ISO 1762 pdf download

ISO 1762 pdf download.Paper, board and pulps — Determination of residue (ash) on ignition at 525 °C 1 Scope This International Standard describes the determination of the residue (ash) on ignition of paper, board and pulp at . It is applicable to all types of paper, board and pulp samples. The ash may consist of a) mineral matter in the pulp and various residues from chemicals used in its manufacture, b) metallic matter from piping and machinery, and c) fillers, pigments, coatings or residues from various additives. In samples containing calcium carbonate, there is practically no decomposition of carbonate by ashing at . Other fillers and pigments such as clay and titanium dioxide are also unaffected by ashing at . Accordingly, the residue on ignition as determined by this International Standard provides a good estimate of the total inorganic matter in the sample, provided that the sample does not contain other minerals which decompose at or below this temperature. For example, magnesium carbonate and calcium sulfate may, at least partly, decompose at temperatures below 525 °C 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1 86:— 1 ) , Paper and board— Sampling to determine average quality ISO 287:1 985, Paper and board— Determination of moisture content— Oven-drying method ISO 638:1 978, Pulps — Determination of dry matter content ISO 721 3:1 981 , Pulps — Sampling for testing 3 Term and definition For the purposes of this International Standard, the following term and definition applies. 3.1 residue on ignition ash on ignition mass of the residue remaining after a sample of paper, board or pulp is ignited in a furnace at as specified in this International Standard 4 Principle A test specimen is weighed in a heat-resistant crucible and ignited in a muffle furnace at . The moisture content of a separate test specimen is also measured. The percentage ash is then determined, on a moisture-free basis,...