本文件规定了测定纤维素纳米材料悬浮液中干物质含量的烘箱干燥方法。本程序适用于纤维素纳米材料悬浮液，该悬浮液不含任何可感知数量的材料，但在105℃±2℃的温度下易挥发的水除外。例如，在实验室进行化学和物理试验的纤维素纳米材料悬浮液样品中，当需要同时测定干物质含量时。 注1: ISO 638-1[1]规定了纸张、纸板、纸浆和纤维素纳米材料中固体形式的干物质含量，这些材料都可以由原始材料和/或回收材料制成；ISO 287[2]规定了大量纸张和纸板含水量的测定；ISO 4119[3]规定了水性纸浆悬浮液中浆料浓度的测定；ISO 801（所有部分）[4]规定了批量销售质量的测定。 注2:本文件确定样品的总干物质含量，包括任何溶解固体。如果只需要不含溶解固体的纤维素材料含量，则在测量干物质含量e之前去除溶解固体。 g、 通过清洗或透析，注意保留所有纤维素材料。

This document specifies an oven-drying method for the determination of the dry matter content in suspensions of cellulosic nanomaterials. The procedure is applicable to cellulosic nanomaterial suspensions which do not contain any appreciable quantities of materials other than water that are volatile at the temperature of 105 °C ± 2 °C. It is used, for example, in the case of cellulosic nanomaterial suspensions samples taken for chemical and physical tests in the laboratory, when a concurrent determination of dry matter content is required. NOTE 1:  ISO 638-1[1] specifies the dry matter content in paper, board, pulp and cellulosic nanomaterials in solid form, which all can be produced from virgin and/or recycled materials; ISO 287[2] specifies the determination of moisture content of a lot of paper and board; ISO 4119[3] specifies the determination of stock concentration of aqueous pulp suspensions; ISO 801 (all parts)[4] specifies the determination of saleable mass in lots. NOTE 2:  This document determines the total dry matter content of the sample, including any dissolved solids. If only the cellulosic material content free of dissolved solids is desired, dissolved solids are removed prior to measuring the dry matter content e.g. by washing or dialysis, taking care to retain all cellulosic material.