For use with membrane hardware where extra support is needed for improved flow rate and throughput. The polyester drain disk is binder free and has a thickness of 100µm. It provides a flat surface to prevent filter tearing or rupturing. It is also used as a separator between membrane layers in serial stack filtration applications. This chemically inert support disc is available in a variety of diameters for use in a range of devices. Applications include: general laboratory microfiltration, quality control and sterility testing, removal of particles from HPLC solvents, and tissue culture media filtration.