Borosilicate microfiber filter cartridges are highly retentive filters that have a pleated design to maximize surface area. The borosilicate microfiber media in an all polypropylene construction provides excellent chemical compatibility and superior flow per surface area. No adhesives or surfactants are used in the manufacturing process. The borosilicate microfiber is “non-fiber releasing.” The borosilicate microfiber is ideally-suited for microbial reduction. In addition, the media provides superior flow and pressure drop characteristics per unit area. PureFlo® microfiber filter cartridges are well-suited for critical applications where superior flow and particle retention for deformable and non-deformable particle removal is required.Materials of Construction.