SIST EN ISO 182-2:2000

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoffe - Bestimmung des Neigung von Formmassen und Erzeugnissen auf der Basis von Vinylchlorid-Homopolymeren und -Copolymeren, bei erhöhten Temperaturen Chlorwasserstoff und andere saure Produkte abzugeben - Teil 2: pH-Meßgerät-Verfahren (ISO 182-2:1990)Plastiques - Détermination de la tendance des compositions a base d'homopolymeres et copolymeres du chlorure de vinyle a dégager du chlorure d'hydrogene et éventuellement d'autres produits acides a températures élevées - Partie 2: Méthode au pH (ISO 182-2:1990)Plastics - Determination of the tendency of compounds and products based on vinyl chloride homopolymers and copolymers to evolve hydrogen chloride and any other acidic products at elevated temperatures - Part 2: pH method (ISO 182-2:1990)83.080.20PlastomeriThermoplastic materialsICS:Ta slovenski standard je istoveten z:EN ISO 182-2:1999SIST EN ISO 182-2:2000en01-maj-2000SIST EN ISO 182-2:2000SLOVENSKI
STANDARD



SIST EN ISO 182-2:2000



SIST EN ISO 182-2:2000



SIST EN ISO 182-2:2000



SIST EN ISO 182-2:2000



SIST EN ISO 182-2:2000



INTERNATIONAL STANDARD ISO 18212 First edition 1990-12-15 Plastics - Determination of the tendency of compounds and products based on Vinyl chloride homopolymers and copolymers to evolve hydrogen chloride and any other acidic products at elevated temperatures - Part 2: pH method Plastiques - Determination de la tendance des composifions 5 base d’homopolym&es et copolym&es du chlorure de vinyle ZI degager du chlorure d’hydrogene et &entueUement d’autres produits acides 2 temp&atures 4levees - Partie 2: Methode au pH Reference number ISO 182-2: 199O(E) SIST EN ISO 182-2:2000



ISO 182=2:1990(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. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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 Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 182-2 was prepared by Technical Committee ISO/TC 61, Plast&. Together with the three other Parts of ISO 182, it cancels and replaces ISO Recommendation R 1823970, of which the four Parts of ISO 182 constitute a technical revision. ISO 182 consists of the following Parts, under the general title Plastics - Determination of the tendency of compounds and products based on Vinyl chloride homopolymers and copolymers to evolve hydrogen chlor- ide and any other acidic products at elevated temperatures: - Part I: Congo red methods - Part 2: pH method - Part 3: Conductometric method - Part 4: Potentiometric method Annex A of this part of ISO 182 is for information only. 0 ISO 1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, Mthout Permission in writing from the publisher. International Organization for Standardization Case Postale 56 * CH-121 1 Geneve 20 l Switrerland Printed in Switzerland ii SIST EN ISO 182-2:2000



_- INTERNATIONAL STANDARD ISO 182=2:1990(E) Plastics - Determination of the tendency of compounds and products based on Vinyl chloride homopolymers and copolymers to evolve hydrogen chloride and any other acidic products at elevated temperatures - Part 2: pH method WARNING - The use of this part of ISO 182 may invoive hazardous materiais, operations and equipment. This part of ISO 182 does not purport to address all of the safety Problems associated with its use. it is the responsibiiity of the user of this part of ISO 182 to establish appropriate safety and heaith practices and determine the appiicabiiity of reguiatory iimitations Prior to use. 1 Scope 1.1 This part of ISO 182 specifies a method for the determination of the thermal stability at elevated temperatures of compounds and products based on Vinyl chloride homopolymers and copolymers (in the following text abbreviated to PVC) which undergo dehydrochlorination (the evolution of hydrogen chloride). 1.2 The method may be used as a quality-control test during manufacture and conversion of PVC compounds. lt may be used also for the character- ization of PVC compounds and products, especially with regard to the effectiveness of their heat- stabilizing Systems. lt is suitable for coloured compounds and products where a discolouration test under the action of heat may be unsatisfactory. 1.3 The method is recommended for compounded materials and products only, although the method tan be used for polymers in powder form under ap- propriate conditions to be agreed upon between the interested Parties. lt is not recommended for com- pounds in the form of dry blends since such ma- terials may not be sufficiently homogeneous. PVC compounds and products may evolve decom- Position products in addition to hydrogen chloride at elevated temperatures. A limited number of these decomposition products may affect the pH of an ab- sorbing solution. It is not possible to compensate for this effect within the scope of this part of ISO 182, and therefore care is necessary in comparing re- sults for dissimilar compounds and products. In this case, a method suitable for the determination of the chloride ions in the absorbing Solution shall be used (see ISO 182-4). 1.4 The method may also be applied to other plastics materials which tan evolve hydrogen chlor- ide or other hydrogen halides when heated under the conditions prescribed by the relevant specifi- cations, or when agreed upon between the inter- ested Parties. 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 182. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this patt of ISO 182 are encouraged to investigate the possibility of applying the most recent editions of the Standards indicated below. Members of IEC 1 SIST EN ISO 182-2:2000



ISO 182=2:199Q(E) and ISO maintain registers of currently valid lnter- national Standards. ISO 565:1990, Test sieves - Metal wir-e cloth, perfor- ated metal plate and electroformed sheet - Nominal sizes of openings. ISO 3696:1987, Water for analyfical laboratory use - Specidication and test methods. ISO 4793:1980, Laboratory sintered (fritted) filters - Porosity grading, classifica tion and designa Gon. ISO 6353-2:1983, Reagents for Chemical analysis - Part 2: Specifications - First series. 3 Definition For the purposes of this part of ISO 482, the following definition applies. stability time, t,: The time, measured by reference to a predetermined Change in the pH of an absorbing solution, required for a certain amount of hydrogen chloride to be evolved when a given mass of PVC compound or product is maintained at an elevated temperature under the conditions of test described in this part of ISO 182. 4 Principle A test portion of the PVC compound or product is maintained at an agreed temperature in a gas stream and the hydrogen chloride evolved is ab- sorbed in a 0,I mol/1 Solution of sodium chloride. The amount of hydrogen chloride evolved is measured by recording the Change in pH of the sodium chloride Solution. 5 Reagents and materials During the test, use only reagents of recognized analytical grade in accordance with ISO 6353-2. 5.1 Supply of pure nitrogen, containing less than 6 ppm of Oxygen and less than 0,l ppm of carbon dioxide by volume. The purity shall be such that, when the gas is passed through a 0,l mol/1 Solution of sodium chloride at pH 6 for 1 h at a rate of 7,2 I/h + 0,l I/h, the pH of the Solution remains in the ranie 5,7 to 6,7. The gas shall be dried by pass- ing it through a suitable drying agent, and the fiow rate adjusted by means of a needle valve and measured using a suitable flowmeter. 5.2 Sodium chloride solution, c(NaCI) = 0,l mol/l. Dissolve 5,84 g + 0,Ol g of sodium chloride in grade 3 distilled water as defined in ISO 3696, which has been boiled to remove carbon dioxide. Dilute to 1 litre with boiled distilled water of the Same grade. 5.3 Sodium hydroxide solution, c(NaOH) = 0,l mol/l. 5.4 Hydrochlorit acid, c(HCI) = O,+I mol/l. 6 Apparatus The general arrangement of the apparatus is shown in figure 1. The figure Shows a re-usable dehydro- chlorination cell A. This cell may be replaced by a disposable cell B. 6.1 Dehydrochlorination cells 6.1.1 Cell A (re-usable), with shape and dimensions as shown in figure2. A recommended procedure for cleaning is given in annex A. 6.1.2 Cell B (disposable), with shape and dimen- sions as shown in figure3. 6.1.3 Other types of cell may be employed if it has been proved that the results obtained are equivalent to those obtained with one of the cells described in 6.1.1 and 6.1.2. SIST EN ISO 182-2:2000



ISO 18202:1990(E) l 4 1 N2cyllnder 2 Purlfkatlontraln 3 Ball flowmeter 4 Etectronfc temperature Controller (scale dlvlslon 0,l “C) 5 Temperaturesensor 6 Heatlngbath 7 Wttestportfon 6 Dehydrochlorlnatlon cell 9 Thermometer (scale dlvlslonO,l'C) 10 Stllcone ofl 11 Magnetlc stlrrer 12 Absorblng solutlon 13 Measurlng electrodek) 14 pH-meter 15 Recorder Figure 1 - General arrangement of apparatus SIST EN ISO 182-2:2000



ISO 182-2:1990(E) Dimensions in millimetves * k- 40 3 N I > t l m / 0 -1 Spurs Slntered-gloss disc, IO mm dlameter (removable) Figure 2 - Gell A (re-usable) for dehydrochlorination of PVC samples SIST EN ISO 182-2:2000



ISO 182=2:1990(E)
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