Asahipak column


(yasob) #1

please , what column is equivalent to the following column (asahipak ODP-50 , xterra Ms c18 ,symmetry c18 ) ?
what is difference between asahipak ODP-50 ,asahipak ODP-50-4E,ODP-50 6D
ODP-50 6E ,ODP-50G 6A ?