1、 Reference number ISO 16564:2004/Amd.1:2006(E) ISO 2006INTERNATIONAL STANDARD ISO 16564 First edition 2004-10-01 AMENDMENT 1 2006-05-15 Rubber, raw natural Determination of average molecular mass and molecular- mass distribution by size exclusion chromatography (SEC) AMENDMENT 1 Caoutchouc naturel b
2、rut Dtermination de la masse molculaire moyenne et de la rpartition des masses molculaires par chromatographie dexclusion strique (SEC) AMENDEMENT 1 ISO 16564:2004/Amd.1:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be
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7、 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reservedISO 16564:2004/Amd.1:2006(E) ISO 2006 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
8、 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 non-
9、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, Part
10、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 casting a
11、 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. Amendment 1 to ISO 16564:2004 was prepared by Technical Committee ISO/TC 45, Rubber and rubber
12、 products, Subcommittee SC 2, Testing and analysis. ISO 16564:2004/Amd.1:2006(E) ISO 2006 All rights reserved 1 Rubber, raw natural Determination of average molecular mass and molecular-mass distribution by size exclusion chromatography (SEC) AMENDMENT 1 Page 5 Replace Clause 8 by the following: 8 P
13、recision 8.1 An interlaboratory test programme (ITP) was carried out using the guidelines established by ISO/TR 9272, Rubber and rubber products Determination of precision for test method standards, in the period June to July 2002. A type 1 precision was determined on the basis of two measurements o
14、f molecular mass M won each of two different days. Each measurement is designated as a test result. Homogenized natural rubber (NR) was used as the test material and each laboratory used a set of supplied polystyrene standards for calibration. Data on M wobtained from four laboratories were used to
15、calculate the repeatability and reproducibility. 8.2 The precision results as determined by this ITP may not be applied to acceptance or rejection testing for any group of materials or products without documentation that the results of this precision evaluation actually apply to the products or mate
16、rials tested. 8.3 The precision results are given in Table 2. General statements for the use of the precision results are cited below. These are given in terms of both the absolute precision, r and R, and the relative precision, (r) and (R). Repeatability: The repeatability, or local domain precisio
17、n, of the test method has been established as the values given in Table 2. Two individual test results (obtained by the proper use of this International Standard) that differ by more than the tabulated values of r, in measurement units, or (r), in percent, shall be considered as suspect, i.e. to hav
18、e come from different populations. Such a decision suggests that some appropriate investigative action be taken. Reproducibility: The reproducibility, or global domain precision, of the test method has been established as the values given in Table 2. Two individual test results obtained in different
19、 laboratories (by the proper use of this International Standard) that differ by more than the tabulated values of R, in measurement units, and (R), in percent, shall be considered as suspect, i.e. to have come from different populations. Such a decision suggests that some appropriate investigative a
20、ction be taken. Bias: Bias is the difference between a measured average test result and a reference or true value for the measurement in question. Reference values do not exist for this test method and therefore bias cannot be determined. ISO 16564:2004/Amd.1:2006(E) 2 ISO 2006 All rights reservedTa
21、ble 2 Precision data for M wWithin laboratory Between laboratories Material Mean value of M ws rr ( r) s RR ( R) NR 1 910 041 46 160 250 245 13 321 309 887 030 46 where s ris the repeatability standard deviation; s Ris the reproducibility standard deviation; r is the repeatability limit, in measurement units; R is the reproducibility limit, in measurement units; (r) is the repeatability (relative), in percent; (R) is the reproducibility (relative), in percent. ISO 16564:2004/Amd.1:2006(E) ICS 83.040.10 Price based on 2 pages ISO 2006 All rights reserved
