Superspher? Si 60 is a versatile HPLC spherical silica sorbent with a particle size of 4μm and a pore diameter of 60A for normal phase chromatography. This sorbent is packed into a LiChroCART? 250-4 HPLC cartridge. The connection to the HPLC system is being accomplished by use of the manu-CART? NT cartrige holder (1.51486).