Contains a diphenyl bonded phase, which gives greater selectivity for aromatic groups compared to alkyl-type bonded phases.. Parameter: =70 °C temp. range. Surface Coverage: Surface coverage 2.4 µmol/m2. Sold in each. . . Sigma-Aldrich 58842 SUPELCOSIL LC-DP HPLC Column, 5 µm Particle Size, 4.6mm ID, 25cm Length. Country of Origin : United States. Part Number : 1186R17EA. Pack of : 1.