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Membrane Filters

DHI LAB Products is a supplier of GVS filters (former Poretics)


Cheap prices on filters, please see our pricelist

  • Polycarbonate filters, especially suitable for e.g., capturing cells above the pore size of the filter, size fractionation of water samples, or identification and counting of cells by microscopy
  • Black polycarbonate filters, especially suitable for e.g., epifluorescence microscopy
  • Teflon PTFE syringe filters, especially suitable for filtration of organic samples for HPLC, gas,
    strong acids and aggressive solutions

GVS, former Poretics, Polycarbonate Membrane Filters (PCTE)

  • Smooth thin glass-like surface with cylindrical pores capturing 100% of cells larger than pore size 
  • Hydrophilic
  • Ideal for particle identification by microscopy
  • Precise pore sizes and pore distribution for absolute filtration and separation
  • Negligible absorption and adsorption

GVS, former Poretics, Black Polycarbonate Membrane Filters (PCTE)

  • Zero auto fluorescence, ideal for epifluorescence microscopy
  • Hydrophilic
  • Permit phytoplankton, bacteria, yeasts, etc to be visible
  • Smooth surface plane for microscopy

The epifluorescence microscopy technique is used for the assay of microorganisms in water samples, food and dairy products, wines and beverages, and for general micro-biological laboratory, medical, and research purposes.

The basic procedure is simple and reproducible:

  1. A known quantity of liquid is filtered through a black polycarbonate membrane
  2. The microorganisms, e.g., bacteria, can be stained, while some organisms like algae show auto fluorescence
  3. The fluorescing microorganisms are observed using an epifluorescence microscope
GVS, former Poretics (Polycarbonate PCTE) Membrane Filters
 Diameters – mm

13
25
47

 Colors  White (standard)
 Black (suitable for microscopy)
 Pore sizes – µm

0.2
0.4
0.6
0.8
1.0
2.0
3.0
4.0
5.0
8.0
10.0
20.0

Most polycarbonate (PCTE) filters are in stock

GVS, former Poretics, Teflon PTFE Syringe Filters

  • Non-sterile and hydrophobic
  • Especially suited for HPLC samples
  • Negligible absorption and adsorption
 GVS, former GE Osmonics Teflon (PTFE) Syringe Filters
 Diameters – mm17
30
 Pore sizes – µm0.20
0.45

Teflon (PTFE) syringe filters, 0.2 µm pore size and 17 mm diameter are in stock. These are especially suited for pre-filtering solvent extracts prior to HPLC analysis.

Want to know more?

DHI LAB Products
c14@dhigroup.com

Download price list

Download price list