BS ISO 1437:2017 pdf free

BS ISO 1437:2017 pdf free.Rubber compounding ingredients – Carbon black – Determination of sieve residue
The precision of this test method was determined in accordance with ISO/TR 9272:2005, level 2 method. Refer to ISO/TR 9272 for terminology and other statistical details.
The precision results give an estimate of the precision to be expected. The precision parameters are not intended to be used for acceptance/ rejection testing of any group of materials without documentation that they are applicable to those particular materials and the specific testing protocols that include this test method.
A type 1 precision interlaboratory-trials programme was conducted. Both the repeatability and the reproducibility determined represent short-term testing conditions. 16 laboratories tested two carbon blacks, twice on each of two different days: one with a considerable level and one with a very high level of sieve residue. Therefore,p= 16,q= 2 andn= 4. A test result is the value obtained from a single determination. Acceptable difference values were not measured.
The results of the precision calculations are given in Table A.1, with the materials arranged in descending order of mean sieve residue. Outliers have been removed. The number of laboratories remaining after outlier deletion is given in Table A.1.
The precision for the pooled values of the sieve residue may be expressed as follows.
a) Repeatability: the repeatability [r) for the sieve residue has been established as 37,1 %. Two single test results [or determinations) that differ by more than 37,1 %, should be considered suspect and dictate that some appropriate investigative action be taken.
b) Reproducibility: the reproducibility (R) for the sieve residue has been established as 129,0 %. Two single test results (or determinations), produced in separate laboratories, that differ by more than 129,0 %, should be considered suspect and dictate that some appropriate investigative action be taken.
In test method terminology, bias is the difference between an average test value and a reference (true) test property value. Reference values do not exist for this test method since the value of the test property is exclusively defined by the test method. Bias, therefore, cannot be determined.BS ISO 1437 pdf free download.