chromatographic column 1,high surface separate; 2.high carbon content 3.good keep ability Bonded phaseBonded-phase structureGrain sizeaperture specific surface areaLoad carbonPH rangePntulips BP-C18 3um,5um,10um120 Â300m2/g17%1.5~9.5Pntulips QS-C18 3um,5um,10um120Â300m2/g15%1.5~9.5Pntulips BP-C8 3um,5um,10um120Â300m2/g10%1.5~9.5Pntulips BP-C4 3um,5um,10um120Â300m2/g7%1.5~9.5Pntulips BP-NH2 3um, ...