METHOD DETERMINING QUALITY OF LABORATORY FILTERS Russian patent published in 2002 - IPC

FIELD: analytical chemistry, determination of fatty, tarry and cinder substances in defatted and dashed laboratory filters. SUBSTANCE: method includes following operations: determination of appearance, dimensions, filtering potential, neutrality, retaining of sediments, determination of ash content, fatty and tarry substances, packing and marking. Multiple extraction of cellulose with indication of fatty and tarry substances is conducted with the use alcohol-benzene mixture in ratio 1:2 at 70 C and with 10- fold overflow of mixture from extractor to flask. EFFECT: reduced determination time, increased quality of laboratory filters, decreased energy consumption. 1 dwg, 3 tbl