3451/3 International Standard (TSO INTERNATIONALORGANIZATION FOR STANDARDIZATION+MEKAYHAPOAHAA OPTAHW3AUWA IO CTAHAAPTW3ALWWORGANISATION INTERNATIONALE DE NORMALISATION Plastics - Determination of ash -- Part 3: Unplasticized cellulose acetate Plastiques-Détermination du tauxde cendres-Partie3:Acétate de cellulose non plastifie First edition - 1984-05-15 UDC 678.544.4 : 543.822 Ref.No.ISO3451/3-1984 (E) Descriptors : plastics, unplasticized cellulose acetate, tests, determination, ashes. Copyright International Organization for Standardizatior Price based on 2 pages No reproduction or networking permitted without license from IHS Not for Resale Foreword Iso (the international Organization for Standardization) is a worldwide federation of national standards bodies (so 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 authorized 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO 3451/3 was developed by Technical Committee 1SO/TC 61, Plastics, and was circulated to the member bodies in March 1980. It has been approved by the member bodies of the following countries: Belgium India Romania Brazil Ireland South Africa, Rep. of Canada fsrael Spain China Italy Sweden Czechoslovakia Japan Switzerland Egypt, Arab Rep. of Korea, Rep. of United Kingdom Finland Mexico USA France Netherlands USSR Germany, F.R. Poland Hungary Portugal No member body expressed disapproval of the document. This International Standard cancels and replaces ISo Recommendation R 872-1968, of which it constitutes a technical revision. @ International Organization for Standardization, 1984 Printed in Switzerland CopyrightInternationalOrganization for Standardization d without license from IHS Not for Resale ISO3451/3-1984(E) INTERNATIONAL STANDARD Plastics -- Determination of ash Part 3: Unplasticized cellulose acetate Scope and field of application 4.2 Bunsen burner, with silica triangle and tripod, or other suitable heating device. 1.1This part of iso 3451 specifies:a method for determining the ash, consisting of inorganic residue, yielded by unplasti- 4.3 Muffle furnace, thermostatically controlled at 575 ± 25 °C cized cellulose acetate. or 850 ± 50 °C. 1.2 This method applies to unplasticized cellulose acetate 4.4 Analytical balance, accurate to 0,1 mg. fect the result. 4.5 Desiccator, containing a drying agent, for example anhydrous chloride. 1.3 When plasticizers, additives, fillers or dyes which may af- fect the resuit are present, they shall be separated by a method agreed between the interested parties. 4.6 Weighing bottle. 1.4 +The ash content at 575 ± 25 oc is a reasonable measure of the mineral salts and inorganic foreign matter inthecellulose Procedure acetate. Theweightofashobtainedvarieswiththe temperature of ignition. Higher temperatures such as 850 °C will convert calcium carbonate and other carbonates to the ox- 5.1 Prepare the crucible (4.1) by heating in the muffle furnace ides and thus give lower values for the ash. The composition of (4.3) at 575 ± 25 -oC or 850 ± 50 oC until constant mass is ashmayvarywiththepuipingprocessused inmanufacture, reached. Allow to cool in the desiccator (4.5) to room which limits the significance of the ash determination in ab- temperature for at least 1 h and weigh to the nearest 0,1 mg. solute terms. 5.2 Introduce into the tared weighing bottle (4.6) a quantity of test sample, predried as prescribed in Iso 585 or with a 2 References known moisture content, corresponding to 5 to 50 mg of ash (usually 10 to 25 g) and weigh it to the nearest 0,1 mg. Is