Whatman offers a choice of holders for use with membrane filters.
Vacuum type glass holders are produced from borosilicate glass and available with a choice of support screen. They are suitable for aqueous and organic solvent filtration. The funnel seal ensures that the sample does not bypass the membrane and that particulates are retained on the surface of the membrane. The sintered glass support is recommended for filtration and biological analysis. The 304 stainless steel support screen is suitable for use with proteinaceous solutions.
Syringe filter type membrane filter holders are available in stainless steel and polypropylene with luer fittings for use with a standard syringe. The holders are designed for the quick and easy clarification, sterilization, and removal of particulates from small volume samples, typically for HPLC applications. The holders contain PTFE gaskets and O-rings and allow the membrane to be autoclaved in place without the filter sticking to the holder.
|Diameter (mm)||Membrane Holder Filter Systems — Glass||Reservoir Volume (mL)||Filter Surface Area (cm2)||Prefilter Diameter (mm)|
Note: 25mm holders have No. 5 stopper, fitting 125mL flasks; 47mm and 90mm holders have No. 8 stoppers, fitting standard manifolds and 1L flasks.