1.1 本试验方法涵盖了纤维素中二氯甲烷可溶物的测定，适用于从棉花或木材制备的溶解型纤维素纸浆。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 二氯甲烷可溶物质通常称为提取物。这些提取物由来自木材或棉花的有机物质组成。该措施表明了制浆和漂白过程中去除这些物质的效率。由于大量提取物的存在可能会抑制纤维素加工成所需衍生物，因此提取物水平是溶解纸浆用户关注的问题。

1.1 This test method covers the determination of dichloromethane-soluble matter in cellulose and is applicable to dissolving-type cellulose pulps prepared from cotton or wood. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Dichloromethane-soluble materials are typically referred to as extractives. These extractives are comprised of organic materials that originated in the wood or cotton. The measure is an indication of the efficiency of removal of these substances during pulping and bleaching. The extractive level is of concern to dissolving pulp users since the presence of large amounts of extractives could inhibit the processing of cellulose into the desired derivative.