USP Specification for High Performance Liquid Chromatography Column.¡¡ UPS No. Description SHINWA Recommendations L01 Octadecyl silane bonded to porous silica or ceramic microparticles, 3 to 10¥ìm in diameter. ULTRON VX-ODS STR ODS-II STR ODS-M L03 Porous silica microparticles, 5¥ìm to 10¥ìm in diameter. ULTRON VX-SIL L07 Octylsilane bonded to totally porous microsilica particles, 3 to 10¥ìm in diameter. ULTRON VX-Octyl L17 Strong cation exchange resin consisting of sulfonated crosslinked styrene-divinylbenzene copolymer in the hydrogen form, 7 to 11¥ìm in diameter. ULTRON PS-80H L19 Strong cation exchange resin consisting of sulfonated crosslinked styrene-divinylbenzene copolymer in the calcium form, 9¥ìm in diameter. ULTRON PS-80C L34 Strong cation exchange resin consisting of sulfonated crosslinked styrene-divinylbenzene copolymer in the lead form, 9¥ìm in diameter. ULTRON PS-80P L45 Beta cyclodextrin bonded to porous silica particles, 5 to 10 ULTRON ES-CD ULTRON ES-PhCD L57 Chiral recognition protein, ovomucoid, chemically bonded to silica particles, about 5¥ìm, with a pore size of 120 ?. ULTRON ES-OVM L58 Strong cation exchange resin consisting of sulphonated crosslinked styrene-divinylbenzene copolymer in the sodium form, about 7 to 11 ¥ìm. ULTRON PS-80N