查看标准

适用范围：<p>These test methods can be used for research or for quality control to determine the isomer content of toluene diisocyanates. </p> <p>The isomer content of a toluene diisocyanate relates to its reactivity.</p><p id="s00002">1.1 These test methods measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene<span class="unicode">x2013;</span>2,4<span class="unicode">x2013;</span>diisocyanate (2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of toluenediisocyanate (TDI). Two different test methods are provided to give accurate results over the broad range of isomer concentrations possible.</p> <p id="s00003">1.1.1 <span class="italic"><span class="italic">Test Method A</span>8212;</span>Applicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer).</p> <p id="s00004">1.1.2 <span class="italic"><span class="italic">Test Method B</span>8212;</span>Applicable to TDI samples containing 0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer). <p class="desc" id="N00001"> <span class="smallcap">Note</span> 18212;These test methods are equivalent to ISO 15064.</p> </p> <p>1.2 The values stated in SI units are to be regarded as standard.</p> <p id="s00005">1.3 <span class="italic">This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.</span>