• Low hold-up volume
  • Maximum sample recovery
• Polypropylene fiber and housing
  • Compatibility with HPLC solvents
• Streamline design
  • Ability to inject or aspirate from a vial, ampule or test tube without the use of a needle
• Smaller boxes
  • Overall compact package occupies one third the shelf space of the other disc filter packages
• Microporous hollow fibers
  • High flow rate and high throughput

For HPLC

Syringe filters are commonly used in sample preparation for HPLC. They are used to remove any particulates from the sample (which will shorten the life of column as well as the injector) and, as added benefit, provide mixing support so that the drawn sample will be homogeneous. Polypropylene hollow fiber membranes are ideal for HPLC sample preparation. The polypropylene membrane is compatible with all of the common chemicals used as organic and aqueous HPLC solvents.

The use of hollow fibers in these filters allows us to produce filters with less hold-up volume than found in conventional disc-type filters. This permits either greater sample recovery (using similarly sized filters) or faster filtration (using a larger filter).

The DynaGard® hollow fiber syringe filters fit over the tip of a standard luer-lock syringe. The 0.2 µm rated filters can also be used as sterilizing filters if they are autoclaved prior to use.

DynaGard is available with either a 0.2 µm or 0.45 µm pore size and in two different sizes:

• 0,8 cm2 for volumes less than 5 ml (equivalent to 13 mm disc filters)
• 3,9 cm2 for volumes greater than 5 ml (equivalent to 25 mm disc filters)

For Aqueous Filtration Applications

DynaGard® unique streamline shape has been designed with the user's need in mind. Aspiration or injection of fluids into or out of vials, ampules, test tubes and other vessels is now easily accomplished. No additional needle is required to reach in a syringe tip filter with increased surface area and minimal hold-up volume.

DynaGard® filter tips are available in three different surface areas:

• 2,5 cm2 for volumes less than 5 ml.
• 3,4 cm2 with locknut for medical applications
• 5,5 cm2 for volumes greater than 5 ml.

• Clarification of HPLC samples
• Clarification of non-aqueous solvents and reagents
• Sterilisation of aqueous solutions
• Clarification of aqueous solutions
• Gas filtration
• Filtration of small volume fluids

• Membrane.................................................Mixed Cellulose Ester
• Housing.................................................................Polycarbonate
• Potting material........................................................Polyurethane
• Pore Size......................................................0.2 µm and 0,45 µm
• Max Operating Pressure at Room Temp.................75 psi (5 Bar)
• Surface Area.........0,8 cm2, 2.5 cm2, 3.4 cm2, 3,9 cm2, 5.5 cm2