What’s the difference between SW/SWXL and PW/PWXL SEC columns?
FAQ from TOSOH
The “S” in SW and SWXL stands for silica so these columns are created using porous silica. The “P” in PW and PWXL refers to a polymeric support of porous methacrylate. The subscripted XL is used to denote smaller particle, higher efficiency columns. However, the pore size is the same for a given type of column, e.g. G2000SW and G2000SWXL have the same fractionation range.