An Asbestos Sample Filter Clearing Procedure

Abstract

An acetone clearing technique for cellulose ester or nitrate membrane filters is presented. This technique has the advantages of increased safety and more consistent clearing than ones previously recommended in other methods. The technique involves the use of a heated metal block in which a small amount of acetone is rapidly vaporized and ducted to the filter. This prevents spattering of acetone liquid on the filter, reduces the amount of acetone required, and gives even and rapid clearing of the filter. Construction and operational details of the block and associated heating apparatus are presented. Baron, P.A.; Pickford, G.C.: An asbestos sample filter cleaning procedure.