This GD/X™ syringe filter has a polyvinylidene difluoride (PVDF) membrane. It is specifically designed for high particulate loaded samples. Constructed of a pigment-free polypropylene housing with a prefiltration stack of Whatman GMF 150 (graded density) and GF/F glass microfiber media. These filters eliminate sample contamination and allow you to filter even the most difficult samples with less hand pressure. GD/X syringe filters can process three to seven times more sample volume than standard syringe filters. GMF 150 and GF/F are produced from 100% borosilicate glass microfiber. The innovative, graded density GMF 150 medium has a coarse top layer meshed with a fine bottom layer that retains particles to 1.0µm. A GF/F filter then retains particles down to 0.7µm. The prefilter stack ends with a final membrane. GD/X filter construction facilitates exceptional loading capacity with fast flow rates. This prevents the buildup of back pressure typically caused by the blocking of an unprotected membrane. Two sizes available--13mm devices for samples up to 10mL and 25mm devices for samples greater than 10mL (however, the volume of sample that can be filtered through each filter depends on the characteristics of the sample). GD/X syringe filters are ideal for heavily particulate-laden samples found in dissolution testing, content uniformity, concentration analysis, routine sample preparation, food analysis, environmental samples, composite assay. Non-sterile. Autoclave at 121°C (131°C max) at 1 bar (15 psi) for 20 minutes. Dimensions: 20.8 x 29.8mm. Pore Size: 0.45µm. Membrane Diameter: 25mm. Housing: Polypropylene (Pigment Free). Filtration Area: 4.6cm². Maximum Pressure: 5.2 bar (75 psi). Volume Hold Up Full Housing: 1.4mL. Volume Hold Up with Air Purge: Approx. 250µL. Flow Direction: Flow should enter from the inlet. Inlet Connection: Female Luer lock. Outlet Connection: Male Luer. Weight: Approx. 3g. Whatman™ #: 6872-2504A.