1.1本实施规程描述了颗粒炭黑的混合程序、将颗粒炭黑总样品减少至适当尺寸以进行测试的程序以及测试样品的制备。这些技术旨在最大限度地减少测试样本之间测量特性的变化。与炭黑样品相关的标准术语见术语D 3053。 1.2以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 炭黑的几种测试方法要求减少样品尺寸或混合测试样品，以减少测量特性的变化。在其他因素相同的情况下，较大的样本往往更能代表总供应量。本规程提供了将从袋和散装取样规程中获得的大样本减少到方便尺寸的程序，以进行大量试验，描述材料并测量其质量，以使较小部分最有可能代表散装样本。如果不遵循本规程中的程序，可能会导致提供非代表性样本，用于后续测试。 个别测试方法规定了待测试材料的最低数量。 试验方法A， 减少样本量 ，通常用于从大样本中获得小份，将黑色分成两个或多个相等部分，或将试验方法B中的混合黑色减少到指定的样本量。最终样品总是比原始样品小，不会被视为 “ 混合良好 ” 样品 试验方法B， 炭黑的混合 ，通常用于制备均质样品。均质样品可用于多次试验（见注释 3. )或者可以通过试验方法A减小尺寸。最终样品尺寸与原始样品尺寸相同。 当要混合和还原样品时，应在还原（试验方法a）之前混合样品（试验方法B）。 必须在样品干燥之前进行混合和还原（试验方法C）。

1.1 This practice describes the procedure for blending of pelleted carbon black, the procedure for the reduction of gross samples of pelleted carbon black to the appropriate size for testing and the preparation of the sample for testing. These techniques are intended to minimize variations in measured characteristics between test samples. Standard terminology relating to carbon black samples is found in Terminology D 3053. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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. ====== Significance And Use ====== Several test methods for carbon black require the reduction in sample size or the blending of the test sample to reduce the variation of the measured characteristic. Other factors being equal, larger samples will tend to be more representative of the total supply. This practice provides procedures for reducing the large sample obtained from the bag and bulk sampling practices to a convenient size for conducting a number of tests to describe the material and measure its quality in such a manner that the smaller portion is most likely to be a representation of the bulk sample. Failure to follow the procedures in this practice could result in providing a nonrepresentative sample to be used in subsequent testing. Individual test methods provide for minimum amounts of material to be tested. Test Method A, Reduction of Sample Size , is typically used to obtain an aliquot from a large sample, splitting a black into two or more equal portions, or reducing a blended black from Test Method B to a specified sample size. The final sample is always smaller than the original sample and would not be considered to be a “ well blended ” sample. Test Method B, Blending of Carbon Black , is typically used to prepare a homogeneous sample. The homogeneous sample may be used for several tests (see Note 3 ) or may be reduced in size by Test Method A. The final sample size is the same as the original. When a sample is to be blended and reduced, the sample should be blended (Test Method B) before reduction (Test Method A). The blending and reduction must be done before the sample is dried (Test Method C).