The Mastro2 column has a biocompatible PEEK-lined stainless steel body with a high pressure polymer frit. This inertness eliminates adsorption and reduces tailing for compounds that tend to form chelates with metal surfaces, especially those containing phosphate groups. Recommended for the LCMS-8030/8040 method package for highly polar metabolites. Maximum operating pressure is 50MPa/500 bar/7200 psi. pH: 2 - 7.5. Maximum temperature is 80C (pH 3 or higher.) Replacement for SSOT-G10003