TCLP Filter Grade 193 is a binder-free microfiber glass filter made with acid-treated borosilicated glass microfibers with inherently low levels of barium and zind. The filter media contains no binders or other additives that may cause interference with samples. It is recommended for use in the Toxicity Characteristic Leaching Procedure (TCLP) as described in EPA Method 1311. Filtration speed: slow. Retention: 0.7 microns.