Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of pH of aqueous extract (ISO 1264:1980)

Treatment of a test portion of resin with a given volume of an aqueous solution of sodium chloride previous neutralized to pH 7,0. After stirring and decanting, measurement of the potential difference existing between a glass electrode and a reference calomel electrode immersed in the liquid maintained at 23 °C and reading of this difference, expressed in pH units directly on th pH meter scale.

Kunststoffe - Vinylchlorid-Homo- und Copolymerisate - Bestimmung des pH-Wertes des wäßrigen Extraktes (ISO 1264:1980)

Diese Internationale Norm legt ein Verfahren zur Bestimmung des pH-Wertes des wässrigen Extrakts von vinylchlorid-Homo- und Copolymerisaten mittels eines mit einer Gaselektrode ausgerüsteten pH-Messgerätes fest. Diese Bestimmung ist nicht für das Abschätzen der elektrischen Eigenschaften des Polymerisats geeignet, aber sie kann von Interesse sein bei der Wahl von Additiven, insbeson-dere von Stabilisatoren, die für Herstellung von Formmassen verwendet werden.

Plastiques - Résines d'homopolymères et de copolymères de chlorure de vinyle - Détermination du pH de l'extrait aqueux (ISO 1264:1980)

La présente Norme internationale spécifie une méthode de détermination du pH de l'extrait aqueux des résines d'homopolymères et de copolymères de chlorure de vinyle, au moyen d'un pH-mètre muni d'une électrode en verre. Cette détermination n'est pas utilisable pour juger des qualités électriques de la résine, mais peut être intéressante pour le choix des adjuvants et, en particulier, des stabilisants à utiliser pour la préparation des compositions1).

Polimerni materiali - Homo- in kopolimeri vinilklorida - Določevanje pH vodnega ekstrakta (ISO 1264:1980)

General Information

Status
Published
Publication Date
22-Jul-1997
Withdrawal Date
30-Jan-1998
ICS
83.080.20 - Thermoplastic materials
Technical Committee
CEN/TC 249 - Plastics
Drafting Committee
CEN/TC 249/SC 1/WG 8 - Polyvinyls
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
23-Jul-1997
Completion Date
23-Jul-1997
Ref Project
SIST EN ISO 1264:2000 - Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of pH of aqueous extract (ISO 1264:1980)

Overview

EN ISO 1264:1997 is an internationally recognized standard developed by CEN, specifying the method for determining the pH of aqueous extracts from homopolymer and copolymer resins of vinyl chloride. This test method involves treating a test portion of the resin with a controlled volume of a neutralized sodium chloride aqueous solution and measuring the pH of the resulting extract using a pH meter equipped with a glass electrode. The temperature during measurement is maintained at 23 ± 2 °C to ensure accuracy.

The standard provides a reliable procedure to evaluate the pH characteristics of vinyl chloride-based plastic resins-essential for quality control and formulation in plastic manufacturing. Accurate pH determination helps in assessing resin quality and guiding additive stabilization.

Key Topics

  • Scope and Purpose
    Defines pH testing of aqueous extracts from vinyl chloride homopolymer and copolymer resins to assist in selecting additives and stabilizers in resin compound preparation.

  • Test Procedure

    • Use a sodium chloride solution (10 g/L), neutralized to pH 7.0 ± 0.2 as extraction medium.
    • Mix resin sample (10 ± 0.5 g) with 50 ± 2 mL of the sodium chloride solution.
    • Stir vigorously for 60 ± 5 minutes, then allow the mixture to settle for 5–10 minutes.
    • Decant or pipette the liquid phase and measure pH with a temperature-compensated pH meter.

  • Apparatus Required

    • pH meter with glass electrode and temperature compensation
    • Calomel reference electrode
    • Mechanical shaker/stirrer
    • Pipette, beaker, and stopper-fitted flask.

  • Measurement Accuracy
    Duplicate pH measurements should be performed, with results agreeing within 0.2 pH units. Results are reported to one decimal place.

  • Glassware Preparation
    Glass apparatus must be deactivated by acid treatment and thorough rinsing to prevent contamination affecting pH readings.

Applications

  • Quality Control in Plastics Manufacturing
    pH determination aids in verifying the chemical stability of vinyl chloride resins, ensuring consistency across production batches.

  • Additive and Stabilizer Selection
    The resin’s pH data supports the development of formulations by guiding the choice of stabilizers and additives compatible with specific resin qualities.

  • Research and Development
    Provides a standardized method for comparing resin behavior in aqueous extracts, helping R&D teams optimize resin performance.

  • Regulatory Compliance
    Adhering to EN ISO 1264:1997 ensures that pH measurements align with accepted international testing standards, facilitating global trade and certification.

Related Standards

  • ISO 9001: Quality Management Systems
    Ensures consistent application of testing procedures as part of broader quality management in plastics production.

  • EN ISO 11357: Plastics - Differential Scanning Calorimetry
    Complements physical testing of vinyl chloride resins by providing thermal property data.

  • ISO 175: Plastics - Methods of test for the determination of the effects of immersion in liquid chemicals
    Useful alongside pH testing to assess chemical resistance of plastics.

  • ISO 6270: Paints and Varnishes - Determination of Resistance to Humidity
    Relevant for coatings made from vinyl chloride resins after pH evaluation.

Keywords: EN ISO 1264, pH determination, vinyl chloride resins, homopolymer, copolymer, plastics testing, aqueous extract, pH meter, resin quality control, sodium chloride solution, additive stabilization, plastics industry standards.

Frequently Asked Questions

EN ISO 1264:1997 is a standard published by the European Committee for Standardization (CEN). Its full title is "Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of pH of aqueous extract (ISO 1264:1980)". This standard covers: Treatment of a test portion of resin with a given volume of an aqueous solution of sodium chloride previous neutralized to pH 7,0. After stirring and decanting, measurement of the potential difference existing between a glass electrode and a reference calomel electrode immersed in the liquid maintained at 23 °C and reading of this difference, expressed in pH units directly on th pH meter scale.

Treatment of a test portion of resin with a given volume of an aqueous solution of sodium chloride previous neutralized to pH 7,0. After stirring and decanting, measurement of the potential difference existing between a glass electrode and a reference calomel electrode immersed in the liquid maintained at 23 °C and reading of this difference, expressed in pH units directly on th pH meter scale.

EN ISO 1264:1997 is classified under the following ICS (International Classification for Standards) categories: 83.080.20 - Thermoplastic materials. The ICS classification helps identify the subject area and facilitates finding related standards.

EN ISO 1264:1997 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


SLOVENSKI STANDARD
01-maj-2000
3ROLPHUQLPDWHULDOL+RPRLQNRSROLPHULYLQLONORULGD'RORþHYDQMHS+YRGQHJD
HNVWUDNWD ,62
Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of pH of
aqueous extract (ISO 1264:1980)
Kunststoffe - Vinylchlorid-Homo- und Copolymerisate - Bestimmung des pH-Wertes des
wäßrigen Extraktes (ISO 1264:1980)
Plastiques - Résines d'homopolymeres et de copolymeres de chlorure de vinyle -
Détermination du pH de l'extrait aqueux (ISO 1264:1980)
Ta slovenski standard je istoveten z: EN ISO 1264:1997
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDlZATION.MEXJJYHAPO,4.lHAR OPI-AHM3AUMR fl0 CTAH,QAPTbl3Al&lkl*ORGANISATION INTERNATIONALE DE NORMALISATION
Homopolymer and copolymer resins of Vinyl
Plastics -
chloride - Determination of pH of aqueous extract
Determination du pH de l ’extrait aqueux
Plas tiques - Rbsines d ’homopolymeres et de copolymkres de chlorure de vinyle -
Second edition - 1980-11-01
U DC 678.7432243 : 543.257.1 Ref. No. ISO 12644980 (E)
Descriptors : plastics, homopolymers, copolymers, Vinyl chloride, resins, tests, determination, pH.
Price based on 2 pages
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bodies). The work of developing Inter-
national Standards is Garried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up 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 1264 was developed by Technical Committee ISO/TC 61,
Plas tics .
This second edition was submitted directly to the ISO Council, in accordance with
clause 5.10.1 of part 1 of the Directives for the technical work of ISO. lt cancels and
replaces the first edition (i.e. ISO 1264-19751, which had been approved by the
member bodies of the following countries :
Australia
Hungary Poland
Austria India Romania
Belgium Iran South Africa, Rep. of
Bulgaria Israel Spain
Canada I taly Sweden
Czechoslovakia Japan Switzerland
Korea, Dem. P. Rep. of Turkey
Egypt, Arab Rep. of
France Korea, Rep. of USA
Germany, F. R. Netherlands Y ugoslavia
Greece New Zealand
The member body of the following country had expressed disapproval of the docu-
ment on technical grounds :
United Kingdom *
Later on the member body of the United Kingdom expressed approval of the second edition.
International Organkation for Standardkation, 1980
Printed in Switzerland
INTERNATIONAL STANDARD ISO 1264-1980 (E)
Homopolymer and copolymer resins of Vinyl
Plastics -
chloride - Determination of pH of aqueous extract
4.2 Pipette.
1 Scope and field of application
This International Standard specifies a method for the deter-
Beaker, of capacity 100 ml.
4.3
mination of the pH of the aqueous extract from homopolymer
and copolymer resins of Vinyl chloride, by means of a pH meter
4.4 Flask, of capacity 100 ml, fitted with a ground glass
equipp
...

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