ASTM D 1993 - 03 (Reapproved 2013)ε1 Standard Test Method for Precipitated Silica-Surface Area by Multipoint BET Nitrogen Adsorption

Current edition approved Nov. 1, 2013. Published January 2014. Originally approved in 1991. Last previous edition approved in 2008 as D1993 – 03 (2008). — 3 p.
This test method covers a procedure which is used to measure the surface area of precipitated hydrated silicas by the conventional Brunauer, Emmett, and Teller (BET)2 theory ofmultilayer gas adsorption behavior using multipoint determinations, similar to that used for carbon black in Test
Method D6556. This test method specifies 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.
This test method is used to determine the nitrogen surface area of precipitated silicas with specific surface areas in the range of 1 to 50 hm²/kg (10 to 500 m²/g).