1.1 本试验方法包括使用多点测定法通过Brunauer、Emmett和Teller（B.E.T.NSA）多层气体吸附行为理论测定总表面积，以及基于统计厚度表面积法的外表面积。 1.2 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。 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。 （最低安全设备应包括防护手套、牢固的眼睛和面部防护）。 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 本试验方法用于测量基于多点氮吸附的炭黑的总表面积和外表面积。NSA测量基于B.E.T.理论，包括总表面积，包括微孔，孔径小于2 nm（20Å）。基于统计厚度法（STSA），外表面面积被定义为橡胶的比表面积。 4.2 CTAB表面积（以前的测试方法 D3765 )已撤回。可以使用以下公式从STSA值估计CTAB值: 等式1 . 该方程基于SRB 5标准的STSA和CTAB测量值的线性回归。

1.1 This test method covers the determination of the total surface area by the Brunauer, Emmett, and Teller (B.E.T. NSA) theory of multilayer gas adsorption behavior using multipoint determinations and the external surface area based on the statistical thickness surface area method. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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. (The minimum safety equipment should include protective gloves, sturdy eye and face protection). 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 This test method is used to measure the total and external surface area of carbon blacks based on multipoint nitrogen adsorption. The NSA measurement is based on the B.E.T. theory and it includes the total surface area, inclusive of micropores, pore diameters less than 2 nm (20 Å). The external surface area, based on the statistical thickness method (STSA), is defined as the specific surface area that is accessible to rubber. 4.2 CTAB Surface Area (formerly Test Method D3765 ) has been withdrawn. The CTAB value may be estimated from the STSA value using Eq 1 . The equation is based on a linear regression of the STSA and CTAB measured values of the SRB 5 standards.