Pore size (µm) 0.2 (3) 0.22 (2) 0.45 (3) 5 (1) Diameter (mm) 4 (2) 13 (3) 25 (3) 30 (1) Available for Sale USA Globally Search term: "Whatman Uniflo H-PTFE 13/0.2um 500/PK" Compare Products: Select up to 4 products. *Please select more than one item to