SIST EN ISO 182-2:2000

• Abstract:

  May be used as a quality-control test during manufacture and conversion of PVC compounds and for coloured compounds. Is not recommended for compounds in the form of dry blends. Defines the stability time. The principle consists in exposing a sample of the material at an agreed temperature in a gas stream, followed by absorption of the hydrogen chloride evolved in a 0.1 mol/l solution of sodium chloride. The amount of hydrogen chloride evolved is measured by recording the change in pH of the sodium chloride solution. Figures show the general arrangement of apparatus and details of the dehydrochlorination cell. Together with three other parts of ISO 182, cancels and replaces ISO Recommendation R 182:1970.

• Status: Published
• Publication Date: 30-Apr-2000
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2000
• Due Date: 01-May-2000
• Completion Date: 01-May-2000
• Ref Project: EN ISO 182-2:1999 - 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)

• Replaces: SIST ISO 182-2:1996 - 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
• Effective Date: 01-May-2000
• Refers: SIST ISO 4793:1995 - Laboratory sintered (fritted) filters -- Porosity grading, classification and designation
• Effective Date: 25-Aug-2026
• Refers: SIST ISO 565:2003 - Test sieves -- Metal wire cloth, perforated metal plate and electroformed sheet -- Nominal sizes of openings
• Effective Date: 25-Aug-2026
• Refers: SIST ISO 6353-2:1995 - Reagents for chemical analysis -- Part 2: Specifications -- First series
• Effective Date: 09-Feb-2026
• Refers: SIST ISO 3696:1995 - Water for analytical laboratory use -- Specification and test methods
• Effective Date: 09-Feb-2026
• Refers: SIST EN 12503-2:2002 - Sports mats - Part 2: Pole vault and high jump mats, safety requirements
• Effective Date: 28-Jan-2026
• Referred By: SIST EN IEC 60684-2:2025 - Flexible insulating sleeving - Part 2: Methods of test (IEC 60684-2:2025)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60601-1-6:2005 - Medical electrical equipment -- Part 1-6: General requirements for safety - Collateral standard: Usability
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60684-2:1998 - Flexible insulating sleeving -- Part 2: Methods of test
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 60684-2:2011 - Flexible insulating sleeving - Part 2: Methods of test
• Effective Date: 09-Feb-2026
• Referred By: SIST EN 15346:2015 - Plastics - Recycled plastics - Characterisation of poly(vinyl chloride) (PVC) recyclates
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 15346:2024 - Plastics - Recycled plastics - Characterization of poly(vinyl chloride) (PVC) recyclates
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 709:1998+A4:2010 - Agricultural and forestry machinery - Pedestrian controlled tractors with mounted rotary cultivators, motor hoes, motor hoes with drive wheel(s) - Safety
• Effective Date: 28-Jan-2026

SIST EN ISO 182-2:2000 is the SIST adoption of ISO 182-2 for plastics based on vinyl chloride homopolymers and copolymers. It specifies the pH method for measuring the tendency of PVC compounds and products to evolve hydrogen chloride and other acidic products at elevated temperatures. The method is used to compare thermal stability, heat-stabilizer performance, and the behavior of compounded and coloured PVC materials.

What does SIST EN ISO 182-2:2000 specify?

SIST EN ISO 182-2:2000 specifies a thermal stability test for PVC compounds and products, using the change in pH of a sodium chloride absorbing solution to measure evolved hydrogen chloride. It is organized into clauses for scope, references, definition, principle, reagents, apparatus, sample preparation, procedure, result expression, precision, and the test report.

Annex	What it covers
Annex A	Cleaning the apparatus

The scope covers quality-control use during manufacture and conversion, and characterization of PVC compounds and products. The method is suitable for coloured compounds and products where a heat-discolouration check may be less useful. It is recommended for compounded materials and products, and the standard notes that dry blends are not a good fit because they may be too non-homogeneous.

What are the key requirements of SIST EN ISO 182-2:2000?

Principle and measurement

• Clause 4 measures hydrogen chloride by passing nitrogen over a heated test portion and absorbing the evolved gas in 0.1 mol/l sodium chloride solution. The pH change is then recorded. In practice, this means the result depends on both the sample and tight control of the gas and liquid handling.
• Clause 1.3 warns that other decomposition products can also affect pH. For dissimilar compounds and products, results need careful comparison, and ISO 182-4 is named for chloride-ion determination when pH alone is not enough.

Sample preparation and test conditions

• Clause 7 gives different preparation routes for plastisols, pellets, extrudates, mouldings, thick sheet, film, coatings, and cable insulation or sheathing. This matters because sample form affects surface area and therefore the measured stability time.
• Clause 9 gives preferred test temperatures of 200 °C for unplasticized compounds and products, 200 °C for cable insulation and sheathing, and 180 °C for plasticized compounds and products. Users need to agree the test temperature with the material type.

Apparatus and reagents

• Clause 5 requires analytical-grade reagents and a nitrogen supply of suitable purity and dryness. The nitrogen is checked by its ability not to shift the pH of the absorbing solution during a blank exposure.
• Clause 6 defines the apparatus, including dehydrochlorination cells A and B, the oil bath, the pH-meter, the stirring arrangement, and the gas flowmeter. The bath must hold temperature within 0.1 °C, the gas flow is 120 cm3/min ± 4 cm3/min, and the pH-meter must read to at least 0.01 pH units. In practice, the setup must be stable enough that equipment variation does not dominate the result.

Test execution, result, and report

• Clause 8 requires at least two determinations on each sample.
• Clause 10 starts with purging the system with nitrogen, then immersing the dehydrochlorination cell and tracking the pH until it reaches 3.8.
• Clause 11 defines stability time, t_s, as the time to reach that pH value. Clause 13 requires reporting the material, test temperature, cell type, individual results, mean value, deviations, and test date.

What terms does SIST EN ISO 182-2:2000 define?

• PVC - vinyl chloride homopolymers and copolymers covered by the method.
• stability time, t_s - the time needed for the absorbing solution to reach the specified pH change under the test conditions.
• dehydrochlorination - the evolution of hydrogen chloride from the heated material.
• absorbing solution - the 0.1 mol/l sodium chloride solution that captures evolved hydrogen chloride.
• test portion - the prepared sample placed in the dehydrochlorination cell.
• pH meter - the instrument used to follow the change in the absorbing solution during the test.

Who uses SIST EN ISO 182-2:2000?

SIST EN ISO 182-2:2000 is used by laboratories and production teams working with PVC compounds and products. It is relevant for quality control during manufacture and conversion, for checking the effectiveness of heat-stabilizing systems, and for characterizing coloured compounds and products. It is also used when a material supplier or buyer needs a laboratory method to compare thermal stability under agreed conditions.

What changed in SIST EN ISO 182-2:2000 from the previous edition?

SIST EN ISO 182-2:2000, together with the other three parts of ISO 182, cancels and replaces ISO Recommendation R 182:1970. The foreword describes the four parts of ISO 182 as a technical revision of that recommendation.

Which standards are used with SIST EN ISO 182-2:2000?

• ISO 565 - provides the test sieve openings used when preparing particulate test material.
• ISO 3696 - specifies the water quality used for the sodium chloride solution.
• ISO 4793 - specifies the porous sintered-glass filter used in the reusable cell arrangement.
• ISO 6353-2 - provides the analytical-grade reagent specification used for the test chemicals.
• ISO 182-4 - is named for chloride-ion determination when pH results may be affected by other decomposition products.

What does the SIST EN ISO 182-2:2000 document contain?

The standard gives the full test sequence from sample preparation through result reporting. It includes the general apparatus layout and detailed drawings of the dehydrochlorination cells, tubes, and measurement cell in Figures 1 to 6. It also includes precision data in Tables 1 to 3, which support repeatability and reproducibility checks. Annex A gives cleaning procedures for the reusable cell, sintered-glass discs, connecting tube, and measurement cell, which is important for avoiding residue from one test affecting the next.

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
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)
...