1.1 这种做法 2. 包括转换运动粘度（单位:mm）的转换表和方程 2. /s在任何温度下转换为相同温度下的赛氏通用粘度，单位为赛氏通用秒（SUS），并用于转换运动粘度，单位为mm 2. /s在122 华氏度和210度 华氏度（50 °C和98.9 °C）至相同温度下的赛波特糠醇粘度，单位为赛波特糠醇秒（SFS）。运动粘度值基于1.0034的水 毫米 2. /s（cSt）68 华氏度（20 °C）。 1.2 如果是试验方法以外的方法 D445 用于生成运动粘度数据，在执行本规程的计算之前，应用该方法精度部分中找到的适当相对偏差校正系数。 注1: 中的方程 D2161 最初是使用来自这两个领域的数据根据经验得出的 D445 和赛波特粘度计法。因此，可以想象，如果不将所用的运动粘度校正为偏差，则可能会产生误差 D445 后果建议以毫米平方/秒为单位报告运动粘度，而不是赛波特通用秒（SUS）或赛波特糠醇秒（SFS）。保留该方法是为了根据过去文献中出现的SUS和SFS数据计算运动粘度。每秒1毫米平方（mm 2. /s） 等于一厘斯托克（cSt），这是旧文献中常见的另一个单位。 1.3 以国际单位制表示的数值应视为标准。 括号中给出的值仅供参考。运动粘度的国际单位为毫米 2. /s。 1.3.1 例外情况- 本实践中使用华氏温度单位，因为工业界接受本实践中描述的传统转换类型。 1.4 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。 1.5 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 石油工业一度依赖于使用赛波特粘度计测量运动粘度，并以赛波特通用秒（SUS）和赛波特糠醇秒（SFS）为单位表示运动粘度。这种做法现在在石油行业已经过时。 4.2 本规程建立了将SUS和SFS与SI运动粘度单位（mm）相关的官方方程 2. /s。 4.3 这种做法允许在运动粘度的SUS和SFS单位与SI单位之间进行转换。

1.1 This practice 2 covers the conversion tables and equations for converting kinematic viscosity in mm 2 /s at any temperature to Saybolt Universal viscosity in Saybolt Universal seconds (SUS) at the same temperature and for converting kinematic viscosity in mm 2 /s at 122 °F and 210 °F (50 °C and 98.9 °C) to Saybolt Furol viscosity in Saybolt Furol seconds (SFS) at the same temperatures. Kinematic viscosity values are based on water being 1.0034 mm 2 /s (cSt) at 68 °F (20 °C). 1.2 If a method other than Test Method D445 is used to generate the kinematic viscosity data, apply appropriate relative-bias correction factors as found in the precision section of that method, before performing the calculations of this practice. Note 1: The equations in D2161 were originally empirically derived using data from both D445 and the Saybolt viscometer method. Therefore, it is conceivable that an error could result if the kinematic viscosities used are not bias-corrected to D445 results. It is recommended that kinematic viscosity be reported in millimetres squared per second, instead of Saybolt Universal Seconds (SUS) or Saybolt Furol Seconds (SFS). This method is being retained for the purpose of calculation of kinematic viscosities from SUS and SFS data that appear in past literature. One millimetre squared per second (mm 2 /s) equals one centistoke (cSt), which is another unit commonly found in older literature. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for reference information purposes only. The SI unit of kinematic viscosity is mm 2 /s. 1.3.1 Exception— Fahrenheit temperature units are used in this practice because they are accepted by industry for the type of legacy conversions described in this practice. 1.4 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. 1.5 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 At one time the petroleum industry relied on measuring kinematic viscosity by means of the Saybolt viscometer, and expressing kinematic viscosity in units of Saybolt Universal Seconds (SUS) and Saybolt Furol Seconds (SFS). This practice is now obsolete in the petroleum industry. 4.2 This practice establishes the official equations relating SUS and SFS to the SI kinematic viscosity units, mm 2 /s. 4.3 This practice allows for the conversion between SUS and SFS units and SI units of kinematic viscosity.