The Kromasil® Classic 300 Å family of products is designed to be the perfect choice for proteins and biomolecules larger than 8–10 kDa. This 300 Å material has a narrow pore size distribution that ensures good mass transfer for larger molecules, resulting in narrow peaks and no size-exclusion effects. The figures below show FE-SEM studies of Kromasil® 300 Å, indicating a very regular pore structure, with no voids nor dense clusters.