1) Material: high hardness materials, the main ingredient and the high boron silicon as the auxiliar 1) Material: high hardness materials, the main ingredient and the high boron silicon as the auxiliary.2) Types: Chromatography column with filtration material, Chromatography column with PTFE3) Specification: 16*200, 16*450, 22*450, 30*300, 40*450, 16*300/24, 22*200/24, 30*450/24, 40*200/24mm4) ...