ASTM D 5604 - 96 (Reapproved 2017) Standard Test Methods for Precipitated Silica - Surface Area by Single Point B.E.T. Nitrogen Adsorption

Current edition approved Feb. 1, 2017. Published March 2017. Originally approved in 1994. Last previous edition approved in 2012 as D5604 – 96 (2012). — 6 p.
These test methods cover a procedure to measure the surface area of precipitated hydrated silicas by, a single point approximation of the Brunauer, Emmett, and Teller (B.E.T.)2 theory of multilayer gas adsorption. These test methods specify the sample preparation and treatment, instrument calibrations, required accuracy and precision of experimental data, and calculations of the surface area results from the obtained data.
These test methods are used to determine the single point nitrogen surface areas in the range of 10 to 50 hm2 kg (10 to 500 m2/g).