ISO INTERNATIONAL STANDARD 2817 Second edition 1999-07-15 Tobacco and tobacco products - Determination of silicated residues insoluble in hydrochloric acid Tabac et produits du tabac Détermination des résidus silicatés insolubles dans I'acide chlorhydrique ISO Reference number ISO 2817:1999(E) by IHS under lic itted without license from IHS Not for Resale ISO 2817:1999(E) Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(lso liaison with ISO, also take part in the work. iSO collaborates closely with the International Electrotechnical Commission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. International Standard ISO 2817 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 1, Physical and dimensional tests. Thissecondeditioncancelsandreplacesthefirstedition(lSO2817:1974),whichhasbeentechnicallyrevised Annex A of this International Standard is for information only. @ISO1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic r mechanical, including photocopying and microfilm, without permissic nternational OrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] Printed in Switzerland ational Organization for Standardizatio INTERNATIONAL STANDARD @ISO ISO 2817:1999(E) Tobacco and tobacco products Determination of silicated residues insoluble in hydrochloric acid 1 Scope insoluble extraneous silica particles, especially particles of sand, in tobacco (whole leaf, cut tobacco, tobacco scraps and dust) and tobacco products. It is particularly useful to know the proportion of these residues, in the following circumstances: when buying tobacco leaves, in order to check the cleanness; before processing tobacco and tobacco products. 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 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 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet - Nominal sizes of openings. IsO 4874, Tobacco Sampling of batches of raw material - General principles. Iso 6488-1, Tobacco — Determination of water content Part 1: Karl Fischer method. 3 Term and definition For the purposes of this International Standard, the following term and definition apply. 3.1 hydrochloric-acid-insoluble silicated residues residual material of whole leaf or cut tobacco, tobacco scraps and dust, obtained after incineration and extraction of hydrochloric-acid-soluble material under the conditions specified in this International Standard 4 Principle A test portion is incinerated at a temperature of 65o C ± 50 C. The ashes are leached with hydrochloric acid, then re-incinerated at 650 ℃ ± 50 . The residue is weighed. Copyright Intern onal Organization for Standardizatior Not for Resale