BS 6057-3.5:1996:2006 Edition
$86.31
Rubber latices. Methods of test – Determination of KOH number of natural rubber latices
| Published By | Publication Date | Number of Pages |
| BSI | 2006 | 12 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD BS 6057-3.5: 1996 ISO 127:1995 Rubber latices – Part 3: Methods of test – Section 3.5: Determination of KOH number of natural rubber latices |
| 2 | This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1996 Committees responsible for this British Standard |
| 3 | Contents |
| 4 | National foreword |
| 5 | 1 Scope 2 Normative references 3 Definition 3.1 KOH number (of latex) 4 Reagents 4.1 Potassium hydroxide, standard volumetric solution, c(KOH) = 0,1 mol/dm3, carbonate-free. 4.2 Potassium hydroxide, standard volumetric solution, c(KOH) = 0,5 mol/dm3, carbonate-free. 4.3 Formaldehyde, 45 g to 50 g in 1 dm3 of solution [c(HCHO) = 1,5 mol/dm3 to 1,67 mol/dm3], acid-free, prepared by diluting con… 5 Apparatus 5.1 pH-meter, conforming to ISO 976 but capable of being read to 0,01 units. 5.2 Glass electrode, of a type suitable for use in solutions of pH up to 12,0. 5.3 Mechanical stirrer, with earthed motor and glass paddle, or magnetic stirrer. 6 Sampling 7 Procedure |
| 6 | 8 Expression of results 9 Precision statement 9.1 The precision of this method was determined in accordance with ISO/TR 9272. Refer to this document for terminology and explanations of statistical concepts. 9.2 The precision details in this precision statement give an estimate of the precision of this test method with the materials u… 9.3 The precision results are given in Table 1. The precision is expressed on the basis of a 95 % confidence level for the values established for repeatability r and reproducibility R.” |
| 7 | 9.4 The results contained in Table 1 are mean values and give an estimate of the precision of this test method as determined in … 9.5 A type 1 precision was determined, based on the sampling method used for the latex samples in the ITP. 9.6 Repeatability: The repeatability r (in measurement units) of this test method has been established as the appropriate value … 9.7 Reproducibility: The reproducibility R (in measurement units) of this test method has been established as the appropriate va… 9.8 Bias: In test method terminology, bias is the difference between an average test value and the reference (or true) test property value. Table 1 – Estimate of precision of determination of KOH number 10 ” Test report a) a reference to this International Standard; b) all details necessary for complete identification of the sample; c) all details necessary for complete identification of the pH-meter used; d) the result obtained; e) the correction applied for boric acid, if present; f) details of any operation not included in this International Standard or regarded as optional; g) the date of the test. |
| 8 | Table B.1 – Example of a typical titration to show variation in pH |
| 9 | Figure B.1 – Illustrative curve showing change of pH during titration |
| 10 | List of references |
| 12 | BS 6057-3.5: 1996 ISO 127:1995 |
