In HPLC analysis, the particle size of the column packing is small and is easily blocked by impurity particles. Therefore, samples and solvents need to be filtered in advance to remove particulate contaminants and protect the instrument. Different pore sizes filter pollutants of different sizes. Individually packaged, 100pcs per pack, 40PK/carton.56*50*26cm.12.5KG.packed in PP-Trays with plastic film and cover plate, neutral cartons outside OEM packing can be also provided.