1、BRITISH STANDARD BS EN ISO 1264:1997 BS 2782-4: Method 454C:1997 Plastics Homopolymer and copolymer resins of vinyl chloride Determination of pH of aqueous extract The European Standard EN ISO 1264:1997 has the status of a British Standard ICS 83.080.20BSEN ISO1264:1997 This British Standard, having
2、 been prepared under the directionof the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 September 1997 BSI 09-1999 ISBN 0 580 28504 9 National foreword This British Standard is the English language version of ENISO1264:1
3、997. It is identical with ISO 1264:1980. It supersedes BS 2782-4:Method 454C:1978 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/34, Vinyl chloride, which has the responsibility to: aid enquirers to understand the text; present to the responsible
4、 international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request
5、to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding or European publications. The British Standards which implement international or European
6、 publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessar
7、y provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO
8、 title page, page 2, the ISO title page, pages ii to iv, pages1 and2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. D
9、ate CommentsBSEN ISO1264:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword 2 Foreword iii Text of ISO 1264 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1264 July 1997 ICS Descriptors: See ISO document English version Plastics Homopolymer and copolyme
10、r resins of vinyl chloride Determination of pH of aqueous extract (ISO 1264:1980) Plastiques Rsines dhomopolymres et de copolymres de chlorure de vinyle Dtermination du pH de lextrait aqueux (ISO1264:1980) Kunststoffe Vinylchlorid-Homo- und Copolymerisate Bestimmung des pH-Wertes des wrigen Extrakte
11、s (ISO 1264:1980) This European Standard was approved by CEN on 1997-06-13. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and biblio
12、graphical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a
13、 CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norwa
14、y, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worl
15、dwide for CEN national Members. Ref. No. EN ISO 1264:1997 EEN ISO1264:1997 BSI 09-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC61 “Plastics” of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical C
16、ommittee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by month of January1998, and conflicting national standards shall be withdrawn
17、 at the latest by January1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemb
18、ourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Endorsement notice The text of the International Standard ISO1264:1980 has been approved by CEN as a European Standard without any modification.ENISO1264:1997 ii BSI 09-1999 Contents Page Foreword iii 1 Scope and
19、field of application 1 2 Principle 1 3 Reagent 1 4 Apparatus 1 5 Procedure 1 6 Expression of results 1 7 Test report 1 Annex Recommended method for the de-activation of glassware 2 Descriptors: Plastics, homopolymers, copolymers, vinyl chloride, resins, tests, determination, pH.ENISO1264:1997 BSI 09
20、-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for wh
21、ich 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
22、 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, Plastics. This second edition was submitted directly to the ISO Council, in accordance with clause 5.10.1 of part 1 of the Direc
23、tives for the technical work of ISO. It cancels and replaces the first edition (i.e. ISO 1264:1975), which had been approved by the member bodies of the following countries: The member body of the following country had expressed disapproval of the document on technical grounds: United Kingdom 1) Aus
24、tralia Hungary Poland Austria India Romania Belgium Iran South Africa, Rep. of Bulgaria Israel Spain Canada Italy Sweden Czechoslovakia Japan Switzerland Egypt, Arab Rep. of Korea, Dem. P. Rep. of Turkey France Korea, Rep. of USA Germany, F.R. Netherlands Yugoslavia Greece New Zealand 1) Later on th
25、e member body of the United Kingdom expressed approval of the second edition.iv blankENISO1264:1997 BSI 09-1999 1 1 Scope and field of application This International Standard specifies a method for the determination of the pH of the aqueous extract from homopolymer and copolymer resins of vinyl chlo
26、ride, by means of a pH meter equipped with a glass electrode. This determination is not suitable for estimating the electrical qualities of the resin, but may be of interest in selecting additives and, especially, stabilizers which are to be used for the preparation of compounds. 2 Principle Treatme
27、nt of a test portion of resin with a given volume of an aqueous solution of sodium chloride previously neutralized to pH 7,0 0,2. After stirring and decanting, measurement of the potential difference existing between a glass electrode and a reference calomel electrode immersed in the liquid phase of
28、 the mixture maintained at 23 2 C, and reading of this difference, expressed in pH units, directly on the pH meter scale. 3 Reagent Sodium chloride, 10g/l solution, neutral or neutralized to pH 7,0 0,2, with 0,01mol/l acid or alkali solution. (For the preparation of this aqueous solution use only di
29、stilled water.) 4 Apparatus NOTEBefore use, all the glassware should be de-activated by a suitable method, such as the one described in the Annex. 4.1 pH meter, equipped with a glass electrode, allowing pH measurements to the nearest 0,1 pH unit. As temperature has a great influence on measurement r
30、esults, the pH meter used shall be equipped with a device allowing compensation for temperature. The pH meter shall be regularly checked by pH measurement of standard buffer solutions. 4.2 Pipette 4.3 Beaker, of capacity100ml. 4.4 Flask, of capacity 100ml, fitted with a ground glass stopper. 4.5 Mec
31、hanical shaker/stirrer 5 Procedure Before all measurements of pH of the aqueous extract, carry out a blank test on the sodium chloride solution (clause3). This solution can be regarded as correct if the value of the pH, so determined, is between 6,8 and 7,2. If such is not the case, neutralize the s
32、olution again as described in clause3 and carry out a fresh confirmation. If the value of pH is between 6,8 and 7,2, continue the determination as described below: Introduce into the flask (4.4), previously washed out with the sodium chloride solution verified as above: a) 10 0,5g of resin; b) 502ml
33、 of sodium chloride solution. Stopper the flask and place it on the shaker (4.5). Agitate rapidly for 60 5min. Allow the flask to stand for 5 to 10 min to allow the resin to settle (below or on the surface of the liquid). Then, using the pipette (4.2), transfer approximately 30 to 40ml of the liquid
34、 above or below the resin into the beaker (4.3), which has been rinsed beforehand with the sodium chloride solution. (In cases where a large amount of foam has been formed, filtering may be necessary before pipetting.) Measure the pH of the aqueous solution at a temperature of 23 2 C by means of the
35、 pH meter (4.1). Carry out two determinations. Express the values in pH units to one decimal place. If the difference in duplicate determinations is greater than 0,2pH units, carry out a further series of determinations until agreement within this limit is obtained. 6 Expression of results Calculate
36、 the arithmetic mean of the two values finally retained, rounding to the first decimal place, according to the usual rules. NOTECo-operative tests have shown reproducibility between different laboratories, on the values of pH thus determined, of 0,3. 7 Test report The test report shall include the f
37、ollowing particulars: a) reference to this International Standard; b) complete identification of the product tested; c) the result expressed according to clause6; d) any circumstances which may have affected the result.ENISO1264:1997 2 BSI 09-1999 Annex Recommended method for the de-activation of gl
38、assware Immerse the glassware in a100 g/l hydrochloric acid solution for 2 days. Replace the hydrochloric acid with a fresh solution and allow to stand for a further 2 days. Wash copiously with de-ionized water four or five times. Wash with distilled water three times. Dry in an oven at120 C for24h.
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