Spectrum proudly offers proprietary CellMax hollow fiber membranes for implant technology to provide a TRUE-to-LIFE response for drug screening and cancer research. Perfectly suited for implantation, the modified Polyvinylidene Difluoride (mPVDF) hollow fiber membrane is biocompatible, resistant to cell adhesion, hydrophobic and resistant to a wide variety of organic solvents, including most aqueous acids and bases. Furthermore, these hollow fibers can be heat sealed and autoclaved without affecting the molecular weight cut off (500,000 Dalton MWCO) or changing the membrane performance.