Every syringe filter is constructed with the highest-grade virgin polypropylene or MBS housing. Securely welded to prevent bursting and . Whatman Syringeless Filters, 0.2um, .45um, Whatman, Pore Size . Whatman Syringeless Filters. .45um, Pore Size: 0.2um 0.45um , Manufacturer: Whatman . Sartorius Syringeless Filter Claristep 0.45um RC 17C06FT--480