NF ISO 1407

Le présent document spécifie trois méthodes pour la détermination quantitative des matériaux pouvant être extraits des caoutchoucs bruts, naturels et synthétiques, et de leurs composés vulcanisés et non vulcanisés.

<p class="MsoBodyText"><span lang="EN-GB">This document specifies four methods for the quantitative determination of the material extractable from raw rubbers, both natural and synthetic; two of the methods are also applicable to the unvulcanized and vulcanized rubber compounds.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Method A measures the mass of the solvent extract, after evaporation of the solvent, relative to the mass of the original test portion.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Method B measures the difference in the mass of the test portion before and after extraction.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Method C, which is for raw rubbers only, measures the difference in the mass of the test portion before and after extraction using boiling solvent.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Method D, which is for raw rubbers only, measures the difference in the mass of the test portion before and after extraction relative to the mass of the original test portion.</span></p> <p class="Note"><span lang="EN-GB">NOTE 1<span style="mso-tab-count: 1;">        </span>Depending on the test method used, the conditioning of the test portion and the solvent used, the test result is not necessarily the same.</span></p> <p class="Note"><span lang="EN-GB">NOTE 2<span style="mso-tab-count: 1;">        </span>Method C generally gives results which are lower than those obtained with methods A and B due to an equilibrium which is set up, particularly if large test portions are used, depending on the content and the nature of the extractable matter. Method C is, however, a quicker method than method A or method B.</span></p> <p class="Note"><span lang="EN-GB">NOTE 3<span style="mso-tab-count: 1;">        </span>Methods C and D are not suitable if the test portion disintegrates during the extraction.</span></p> <p class="Note"><span lang="EN-GB">NOTE 4<span style="mso-tab-count: 1;">        </span>Method D is normally used for production controls.</span></p> <p class="MsoBodyText"><span lang="EN-GB">Recommendations as to the solvent most appropriate for each type of rubber are given in Annex A.</span></p>