ISO INTERNATIONAL STANDARD 4119 Second edition 1995-06-01 Pulps Determination of stock concentration Pates-Détermination dela concentration enpate ISO Referencenumber ISO 4119:1995(E) ISO 4119:1995(E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be and non-governmental, in liaison with ISO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 4119 was prepared by Technical Committee ISO/Tc 6, Paper, board and pulps, Subcommittee SC 5, Test methods and quality specifications forpulp. This second edition cancels and replaces the first edition (IO 4119:1978), of which it constitutes a technical revision. C ISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the pu'blisher. International Organization for Standardization Case postale56·CH-1211Geneve 20·Switzerland Printed in Switzerland ii INTERNATIONALSTANDARD ISO ISO4119:1995(E) Pulps --- Determination of stock concentration Scope 3.3 Filtering device, such as a Bichner funnel, of diameter 90 mm to 150 mm, a large fitering flask, and This International Standard specifies a method for circular filter paper to fit the funnel; the paper shall be determining the stock concentration of aqueous puip such that all visible fibre and inorganic material will be suspensions. It is used in laboratory procedures for retained. the determination of other pulp properties and is referred to in a range of other isO standards where 3.4 Means for drying the sample, for example pulp suspensions are involved.It isnot intendedfor suitable drying oven or hotplate. The temperature of determining the saleable mass of slush pulps. the drying oven shall be 105 ℃C ± 2 C and that of the hotplate 150℃±15℃. In principle, this method is applicabie to all kinds of aqueouspulpsuspensions. NOTES 2 A microwave oven may optionally be used if the operating conditions (power setting and drying time) are 2 Definitions experimentally determined to produce the same drying effect on pulp as produced by a normal dryingoven. Incorrect operating conditions may cause charring of the For the purposes of this International Standard, the sample. following definitions apply. 3 A temperature of 150 °C for the hotplate may be too 2.1 stock: Aqueous suspension of one or more high for some pulps and cause charring of the sample. pulps, which may contain fillers and additives 3.5 Balance, capable of weighing the dried mat of 2.2 stock concentration: Ratio of the oven-dry fibres with an error of less than 0.1 %. mass of material that can be filtered from a stock sample, to the mass of unfiltered sample, when determined as specified in this International Standard. 4 Sampling and sample preparation NOTE 1 In this International Standard, the stock concen- tration is expressedas a percentage bymass [% (m/m)i. 4.1 General Mix the stock thoroughly. and stir it while the sample is beingtaken.Samples shall be removed with a 3 Apparatus suitable vessel by a scooping action, to minimize the separation of fibres from the water. The entire sample Ordinary laboratory apparatus and may be obtained in one dipping action, or several smaller samples may be combined, but all of the 3.1 Weighing container