Sterile Syringe Filters: Our syringe filters feature proven performance and are made with sterile polyethersulfone (PES) membranes. Each batch is certified for HPLC extractable testing. Filter size: Membrane diameter 33 mm, pore size 0.22 micrometers, 50 per pack. The pore structure is suitable for laboratory sterilization of small volume samples. Bacterial Challenge: LRV greater than 7 per lot for 0.22 micrometer pore size membrane (ATCC 19146, ASTM Bacterial Challenge Test). Endotoxin levels are less than 0.25 EU/mL or less than 2.15 EU per unit (LAL test). High Flux: Larger filter surface area increases flow rate and flux, reducing the pressure required to empty the syringe. Biosafety: Complies with USP bioreactivity testing for Class VI plastics to help ensure experimental accuracy. Color: Green Material: PES Package Contents: 50 x Syringe Filter Only the above package content is included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.