ISO 1125 pdf download

ISO 1125 pdf download.Rubber compounding ingredients — Carbon black — Determination of ash 1 Scope This International Standard specifies a method for determining the ash of all types of carbon black for use in the rubber industry. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1 1 24:1 988, Rubber compounding ingredients — Carbon black shipment sampling procedures . ISO/TR 9272:1 986, Rubber and rubber products — Determination of precision for test method standards . 3 Principle An accurately weighed portion of dried sample is ignited in a crucible until all the carbonaceous material is oxidized. The crucible is cooled in a desiccator, weighed, and the percentage of ash calculated. 4 Apparatus 4.1 Muffle furnace, capable of maintaining a temperature of 550 °C ± 25 °C (or other required temperature). NOTE The use of a vented furnace would decrease the time of heating to constant mass (see 6.3). 4.2 Porcelain crucible, tall form, diameter 35 mm, height 30 mm, with lid. The use of the lid on the crucible is optional. If it is not used, this shall be mentioned in the test report. 4.3 Analytical balance, accurate to 0,1 mg.4.4 Desiccator.4.5 Oven, preferably of the gravity-convection type, capable of temperature regulation to within ± 1 °C at 1 25 °C and temperature uniformity to within ± 5 °C. 5 Sampling Carry out sampling in accordance with ISO 1 1 24. 6 Procedure 6.1 Heat the crucible (4.2), with its lid (if used), in the muffle furnace (4.1 ) at a temperature of 550 °C ± 25 °C for 1 h. Place the crucible (and lid) in the desiccator (4.4). Cool to ambient temperature and reweigh to the nearest 0,1 mg. NOTE If, after cleaning, drying and reweighing at the end of the determination (see 6.4), the crucible is stored in a dessicator, step 6.1 is needed only for new crucibles. 6.2 Dry a little more than 2 g of furnace carbon black or a little more than 5 g of thermal or...