1.1 这些试验方法描述了固体塑料的比重（相对密度）和密度的测定，如片材、棒、管或模制物品。 1.2 描述了两种试验方法: 1.2.1 试验方法A- 用于在水中测试固体塑料，以及 1.2.2 试验方法B- 用于在水以外的液体中测试固体塑料。 1.3 以国际单位制表示的数值应视为标准。 1.4 警告- 许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。 当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 1.5 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。 注1: 本标准不等同于ISO 1183-1方法A。本试验方法提供了更多关于样品重量和尺寸的指南。ISO 1183-1允许在27±2°C的附加温度下进行测试。 1.6 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====== 5.1 固体的比重或密度是一种便于测量的特性，用于识别材料、跟踪样品中的物理变化、指示不同取样单元或样品之间的均匀程度，或指示大型物品的平均密度。 5.2 单一材料密度的变化是由于结晶度的局部差异、增塑剂的损失、溶剂的吸收或其他原因引起的。由于结晶度、热历史、孔隙率和成分（树脂、增塑剂、颜料或填料的类型或比例）的不同，样品的部分可能密度不同。 5.3 密度可用于计算强度重量和成本重量比。

1.1 These test methods describe the determination of the specific gravity (relative density) and density of solid plastics in forms such as sheets, rods, tubes, or molded items. 1.2 Two test methods are described: 1.2.1 Test Method A— For testing solid plastics in water, and 1.2.2 Test Method B— For testing solid plastics in liquids other than water. 1.3 The values stated in SI units are to be regarded as the standard. 1.4 Warning— Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 1.5 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. Note 1: This standard is not equivalent to ISO 1183–1 Method A. This test method provides more guidelines on sample weight and dimension. ISO 1183-1 allows testing at an additional temperature of 27 ± 2°C. 1.6 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 ====== 5.1 The specific gravity or density of a solid is a property that is conveniently measured to identify a material, to follow physical changes in a sample, to indicate degree of uniformity among different sampling units or specimens, or to indicate the average density of a large item. 5.2 Changes in density of a single material are due to localized differences in crystallinity, loss of plasticizer, absorption of solvent, or to other causes. It is possible that portions of a sample differ in density because of their differences in crystallinity, thermal history, porosity, and composition (types or proportions of resin, plasticizer, pigment, or filler). 5.3 Density is useful for calculating strength-weight and cost-weight ratios.