1、BRITISH STANDARDBS EN ISO 1265:2007Plastics Poly(vinyl chloride) resins Determination of number of impurities and foreign particlesThe European Standard EN ISO 1265:2007 has the status of a British StandardICS 83.080.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g
2、54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 1265:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007ISBN 978 0 580 50413 6National for
3、ewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 1265:2007. It supersedes BS EN ISO 1265:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/82, Thermoplastic materials.A list of organizations represented on
4、PRI/82 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publi
5、cationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 1265February 2007ICS 83.080.20English VersionPlastics - Poly(vinyl chloride) resins - Determination of numberof impurities and foreign particles (ISO 1265:2007)Plastiques - Rsines de poly(chlorure de vinyle) -Dterminat
6、ion du nombre dimpurets et de corps trangers(ISO 1265:2007)Kunststoffe - Vinylchlorid-Polymerisate - Bestimmung derAnzahl von Verunreinigungen und Fremdpartikeln (ISO1265:2007)This European Standard was approved by CEN on 29 December 2006.CEN members are bound to comply with the CEN/CENELEC Internal
7、 Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.Th
8、is European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are th
9、e national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland
10、and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 1265
11、:2007: EForeword This document (EN ISO 1265:2007) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee CEN/TC 249 “Plastics“, the secretariat of which is held by IBN/BIN. This European Standard shall be given the status of a national standard, eithe
12、r by publication of an identical text or by endorsement, at the latest by August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to i
13、mplement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerl
14、and and United Kingdom. Endorsement notice The text of ISO 1265:2007 has been approved by CEN as EN ISO 1265:2007 without any modifications. EN ISO 1265:2007Reference numberISO 1265:2007(E)INTERNATIONAL STANDARD ISO1265Second edition2007-02-01Plastics Poly(vinyl chloride) resins Determination of num
15、ber of impurities and foreign particles Plastiques Rsines de poly(chlorure de vinyle) Dtermination du nombre dimpurets et de corps trangers EN ISO 1265:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodie
16、s). 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 represented on that committee. International organizations, governmental and n
17、on-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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Pa
18、rt 2. The main task of technical committees is to prepare International Standards. 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 castin
19、g a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1265 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermo
20、plastic materials. This second edition cancels and replaces the first edition (ISO 1265:1979), which has been technically revised. EN ISO 1265:2007iv Introduction Poly(vinyl chloride) resins are commonly produced as various powders that are essentially white in colour. However, the polymerization of
21、 vinyl chloride monomer into poly(vinyl chloride) uses processes that may cause some particulate impurities to be included in the powders because of the design of the construction plant and the use of heat. This International Standard describes a simple procedure for determining the number of impuri
22、ties and foreign particles in a sample, with clarification of the different cases encountered (highly contaminated, heterogeneous or homogeneous contamination of the sample). EN ISO 1265:20071Plastics Poly(vinyl chloride) resins Determination of number of impurities and foreign particles 1 Scope Thi
23、s International Standard specifies a method for determining the number of impurities and foreign particles in a flattened surface of poly(vinyl chloride) resin. It is not applicable to paste resins because of their finely divided state. 2 Principle A certain quantity of resin is flattened between a
24、rigid plate (covered with a sheet of glazed white paper) and a glass plate containing a grid, and the number of specks (impurities and foreign particles) of size greater than 0,250 mm, i.e. clearly visible to the naked eye, is counted in 25 squares of the grid. The result is expressed, by extrapolat
25、ion, as the number of specks per 100 squares of the grid. 3 Apparatus 3.1 Glass plate, 340 mm 340 mm 4,5 mm, colourless, perfectly transparent, and without defects such as stripes, bubbles or black spots.1)Mark in the centre of the surface of the glass sheet a grid measuring 300 mm 300 mm, consistin
26、g of 100 30 mm 30 mm squares. This grid may be drawn with an indelible pencil, a diamond or any other appropriate tool, on the face of the sheet which is not in contact with the resin. 3.2 Rigid plate, 450 mm 450 mm, covered with a sheet of glazed white paper. 3.3 Timer (e.g. stopwatch). 4 Procedure
27、 Spread out about 200 cm3of the test sample on the rigid plate (3.2). Place the glass plate (3.1) on the test sample and, by slight movements of the plate, spread the sample so that it touches the glass over an area of at least 25 squares, preferably in the centre of the plate. Mark the limits of th
28、e entire 25 selected squares with a thick pencil mark (see Figure 1). Count the number, n1, of coloured and black “specks” (impurities and foreign particles) visible to the naked eye inside the selected squares, within a period of 2 min. The selected squares shall be viewed from a distance of about
29、300 mm in good laboratory lighting conditions. 1) If there are any defects in the glass plate, take this into account in the determination. EN ISO 1265:20072 NOTE 1 2 min is the maximum time before the operators eyes become tired. NOTE 2 A photographic reference scale is provided to indicate which p
30、articles are to be counted (see Figure 2). Repeat the counting process (giving counts of n2, n3, n4) as necessary, using a new test sample each time, according to the following schedule: a) First determination (count n1) If there are too many specks inside the 25 squares to count within 2 min, the n
31、umber of squares examined, S, shall be noted in addition to the number of specks counted, n1, and no further samples shall be tested. If it is possible to count all the specks in the 25 squares within 2 min, carry out a second determination on a fresh test sample. b) Second determination (count n2)
32、If, in the second determination, there are too many specks inside the 25 squares to count within 2 min, the number of squares examined, S, shall be noted in addition to the number of specks counted, n2, and no further samples shall be tested. If n1 n2 3, the contamination is considered to be homogen
33、eous and no further samples shall be tested. If n1 n2W 3, the contamination is considered to be heterogeneous and a third determination shall be carried out on a fresh test sample. c) Third determination (count n3) If, in the third determination, there are too many specks inside the 25 squares to co
34、unt within 2 min, the number of squares examined, S, shall be noted in addition to the number of specks counted, n3, and no further samples shall be tested. If it is possible to count all the specks in the 25 squares within 2 min, carry out a fourth determination on a fresh test sample. d) Fourth de
35、termination (count n4) If, in the fourth determination, there are too many specks inside the 25 squares to count within 2 min, the number of squares examined, S, shall be noted in addition to the number of specks counted, n4. A flow diagram showing the above procedure is included as Annex A. 5 Expre
36、ssion of results The number of specks per 100 squares, P, shall be expressed in accordance with the experimental schedule described in Clause 4 (see also Annex A). If, in any of the determinations, there were too many specks inside the 25 squares to count within 2 min, the resin is highly contaminat
37、ed and the number of specks per 100 squares, P, shall be calculated from the equation: P = (n 100)/S EN ISO 1265:20073where n = n1, n2, n3or n4; S is the number of squares examined. If two determinations were made and n1 n2 3, the contamination of the resin is homogeneous and the number of specks pe
38、r 100 squares, P, shall be calculated from the equation: P = 2(n1+ n2) If four determinations were made, the contamination of the resin is heterogeneous and the number of specks per 100 squares, P, shall be calculated from the equation: P = n1+ n2+ n3+ n46 Test report The test report shall include t
39、he following information: a) all details necessary for complete identification of the product tested; b) a reference to this International Standard; c) the result, expressed in accordance with Clause 5; d) any unusual features noted during the determination; e) the date of the test. EN ISO 1265:2007
40、4 Dimensions in millimetres Key 1 glass sheet 2 rigid plate 3 sheet of glazed white paper 4 resin Broad hatching: area of contact between glass plate and resin. Close hatching: group of 25 squares chosen for the count. Figure 1 Method of spreading the resin on the glass plate to count the impurities
41、 and foreign particles EN ISO 1265:20075Figure 2 Photographic reference scale EN ISO 1265:20076 Annex A (informative) Flow diagram for counting the number of specks (impurities and foreign particles) and expression of results EN ISO 1265:20077EN ISO 1265:2007BS EN ISO 1265:2007BSI389 Chiswick High R
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