Filtration Unit

We offer a wide variety of membrane filter support glassware for most scientific applications that require vacuum filtration.
1. Choose the appropriate support glassware that fits the diameter of the filter membrane you are using (25, 47 or 90mm).
2. Choose the appropriate connection for the flask or bottle you will collect the filtrate in.
The following information will help you select the most appropriate glassware for your specific application.

25mm Support glassware is designed for filtering small volumes of liquids in particulate or biological contamination studies.
47mm Support Glassware is recommended when analyzing up to 500 ml. of liquids for particulate or biological contamination, water/waste water analysis (reference: standards methods for the examination of water and waste water, 18th Edition, 1992), sterility testing of pharmaceuticals by the bacteria retentive filter method (reference: U.S. Pharmacopeia XXIII), and for preparing particulate free or sterile filtrates.
90mm Support glassware is recommended for filtering large sample volumes, liquids with a heavy particulate load and viscous liquids when a high flow rate is required. The larger filter area can provide filtration rates up to four times faster than 47 mm assemblies.

Fritted Glass Supports. Filtration assemblies with fritted glass supports are recommended for general membrane filtration analysis of samples for microbiological or particulate contamination. This support style is recommended when using gridded filters because the glass frit provides the most even distribution of the sample through the filter membrane. All of the fritted glass support bases have a coarse (40-60μm) porosity.

Silicone Stopper Connections. Silicone or neoprene stoppers are the most common connector from the filtration assembly to a Erlenmeyer style flask and are recommended for most routine filtration studies of aqueous solutions. Stoppers are not recommended when filtering organic or most corrosive solutions or when preparing HPLC mobile phase.
Ts 40/35 Glass Joint Connections. Filtration assemblies with Ts 40/38 outer joint connections are recommended when filtering corrosive solutions and organic solvents. This connection style is also recommended when preparing HPLC mobile phase, since the “all-glass” connection eliminates phthalate contamination that can occur when using silicone or neoprene stoppers.
47 mm All Glass Filtration Assemblies with GL45 Thread Connection 
Designed to collect the filtrate directly into a media-type bottle.