颜料和体质颜料的通用试验方法.第23部分:密度测定(用离心机消除夹带的空气)

[中文适用范围]： 应选择已知密度的置换液，其中待测材料不溶，并且具有良好的润湿性能和真空下蒸发速率低。 高沸点芳香族或脂肪族烃是合适的。 进行测定的温度 t 会影响置换液的密度；每次称重均应在恒温下进行。 其原理在于，将一定量的干燥样品称入皮重管中，用置换液润湿，离心直至除去滞留的空气，并根据质量差计算密度。 [外文原描述]： Displacement liquids of known density should be selected in which the material to be tested is insoluble, and which has good wetting properties and a low evaporation rate under vacuum. High-boiling aromatic or aliphatic hydrocarbons are suitable. The temperature, t, at which the determination is carried out affects the density of the displacement liquid; each weighing should be made at a constant temperature. The principle consists in weighing into a tared tube a quantity of a dried sample, wetting it with displacement liquid, centrifuging until the occluded air is removed and calculation of the density from the difference of masses.