Syringe Filter provided by STE-Mart features precision structure which guarantee smooth filtration, reasonable inside space and very low residual rate. Syringe filter outside case is made from high qualified medical grade polypropylene material (PP). And the membrane comes from the world largest filtration membrane company (PALL, 3M and Millipore), which guarantee stable quality and high precision of the membrane aperture. No difference between batch and batch assures the analysis result consistently