本文件规定了一种烘箱干燥法，用于测定纸、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。 它也适用于测定回收纸和纸板的干物质含量。 本程序适用于纸张、纸板、纸浆和纤维素纳米材料，这些材料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，在纸浆、纸张、，以及需要同时测定干物质含量时，在实验室进行化学和物理试验的纸板和纤维素纳米材料样品。 本方法不适用于测定纸浆的干物质含量或纸浆批次的可销售质量。 注1:ISO 638-2[1]规定了测定纤维素纳米材料悬浮液干物质含量的烘箱干燥方法，ISO 287[2]规定了测定大量纸张和纸板的水分含量；ISO 4119[3]规定了纸浆原料浓度的测定；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；如果样品可过滤而不损失纤维素固体，ISO 4119[3]可用于测定原料稠度（固体形式纤维素材料的含量）

This document specifies an oven-drying method for the determination of 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. It is also applicable to the determination of the dry matter content of paper and board for recycling. The procedure is applicable to paper, board, and pulp and cellulosic nanomaterials 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 pulp, paper, and board and cellulosic nanomaterial samples taken for chemical and physical tests in the laboratory, when a concurrent determination of dry matter content is required. This method is not applicable to the determination of the dry matter content of slush pulp or to the determination of the saleable mass of pulp lots. NOTE 1: ISO 638-2[1] specifies an oven-drying method for the determination of the dry matter content of suspensions of cellulosic nanomaterials, ISO 287[2] specifies the determination of the moisture content of a lot of paper and board; ISO 4119[3] specifies the determination of stock concentration of pulps; ISO 801 (all parts)[4] specifies the determination of the 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; in cases where the sample is filterable without loss of cellulosic solids, ISO 4119[3] can be used to determine the stock consistency (content of cellulosic material in solid form)