Silica-based aqueous SEC (GFC) column with tightly controlled pore size to ensure lot-lot reprodcibility for the analysis of high MW proteins (10,000 to 700,000 Da.) Fulfills USP L20, L33, and L59 requirements. Pore size: 1000A, pH range: 3.0 to 7.5. Shipping solvent is 100% H2O. Compatible with 100% methanol or acetonitrile. Exclusion limit approx. 1,000,000 Da.