ISO 18852:2015规定了一种基于Brunauer、Emmett和Teller（BET）气体吸附理论，使用多点测定和统计厚度表面积（STSA）测定炭黑和其他橡胶复合成分（如硅和氧化锌）氮表面积（NSA）的方法，也称为外表面区域。然而，STSA不适用于二氧化硅和氧化锌。 该方法也可用于验证ISO 4652和其他标准中描述的“单点”程序。

ISO 18852:2015 specifies a method for the determination of the nitrogen surface area (NSA) of carbon blacks and other rubber compounding ingredients, like silicas and zinc oxides, based on the Brunauer, Emmett and Teller (BET) theory of gas adsorption using a multipoint determination as well as the determination of the statistical thickness surface area (STSA), otherwise known as the external surface area. STSA, however, is not applicable to silica and zinc oxide. The method can also be used for verifying "single-point" procedures described in ISO 4652 and other standards.