Silica Gel HL & HLF UNIPLATES are hard layer plates with an organic binder and are the most rugged phases available. They can be used in up to 80% water and are recommended for all visualization methods except vigorous charring visualization. These plates use high performance silica gel with small particle diameter and narrow particle size distribution, which results in 25 to 30% faster separation. The “F” indicates the suitability for UV detection at 254nm.