Editors
HPLC contaminant tests (PDF)
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CHROMAFIL® Combi filters  
Syringe filters with integrated glass fiber prefilter  
Features  
Combi syringe filters with a coarse glass fiber prefilter and a small-pore membrane as main filter  
User benefits:
For solutions with a high load of particulate matter: lower back pressure, easy filtration
For high yields of filtrate: more mL of pure filtrate per filter
The technology:
The glass fiber membrane (1.0 µm) removes coarse particles, before they can block the fine main membrane. This results in a better filtration efficiency, especially for highly contaminated samples
  Housing: Solvent-resistant, ultra low bleed polypropylene
  Entry: Luer lock
  Exit: Luer
  Pore diameter: 1.0 / 0.20 µm or 1.0 / 0.45 µm
  Filter diameter: 25 mm
  Void volume: < 80 µL
  Packing unit: 100 filters / BIGbox with 400 filters
     



CHROMAFIL® Xtra GF/PTFE  
Polytetrafluoroethylene syringe filters with glass fiber prefilters  
Features  

GF/PTFE
Hydrophobic membrane
Very resistant towards all kinds of solvents as well as acids and bases; flushing with alcohol, followed by water, makes the originally hydrophobic membrane more hydrophilic
Recommended for solutions with a high load of particulate matter or for highly viscous solutions
  For polytetrafluoroethylene syringe filters without prefilter click here.
Click here for chemical resistance.

Ordering information
Polytetrafluoroethylene – glass fiber combi filters labeled for method validation and certification
Type Pore size Membrane
Standard pack
  [µm] dia. [mm]
Filters/pack REF
GF/PTFE-20/25 1.0/0.20 25 labeled 100 729270
GF/PTFE-45/25 1.0/0.45 25 labeled 100 729271



CHROMAFIL® Xtra GF/PA  
Polyamide (Nylon) syringe filters with glass fiber prefilters  
Features  

GF/PA
Moderately hydrophilic membrane
For filtration of aqueous and organic-aqueous medium polar liquids
Recommended for solutions with a high load of particulate matter or for highly viscous aqueous solutions
  For polyamide syringe filters without prefilter click here.
Click here for chemical resistance.

Ordering information
Polyamide – glass fiber combi filters labeled for method validation and certification
Type Pore size Membrane
Standard pack
  [µm] dia. [mm]
Filters/pack REF
GF/PA-20/25 1.0/0.20 25 labeled 100 729260
GF/PA-45/25 1.0/0.45 25 labeled 100 729261



CHROMAFIL® GF/PET  
Polyester syringe filters with glass fiber prefilters  
Features  

GF/PET
Hydrophilic multipurpose membrane
For polar and nonpolar solutions
the HPLC filter with glass fiber prefilter, especially suited for eluent mixtures of water and organic solvents
Recommended for solutions with a high load of particulate matter or for highly viscous solutions
  For polyester syringe filters without prefilter click here.
Click here for chemical resistance.

Ordering information
Color-coded polyester – glass fiber combi filters
Type Pore size Membrane Color code Standard pack BIGbox
  [µm] dia. [mm] top bottom Filters/pack REF Filters/pack REF
GF/PET-20/25 1.0/0.20 25 blue orange 100 729032 400 729032.400
GF/PET-45/25 1.0/0.45 25 black orange 100 729033 400 729033.400



CHROMAFIL® GF/RC  
Regenerated cellulose syringe filters with glass fiber prefilters  
Features  

GF/RC
Hydrophilic membrane
For aqueous and organic – aqueous liquids, i.e. for polar and medium polar solutions
Recommended for solutions with a high load of particulate matter or for highly viscous aqueous solutions
  For regenerated cellulose syringe filters without prefilter click here.
Click here for chemical resistance.

Ordering information
Color-coded regenerated cellulose – glass fiber combi filters
Type Pore size Membrane Color code Standard pack BIGbox
  [µm] dia. [mm] top bottom Filters/pack REF Filters/pack REF
GF/RC-20/25 1.0/0.20 25 blue blue 100 729050 400 729050.400
GF/RC-45/25 1.0/0.45 25 black blue 100 729051 400 729051.400



CHROMAFIL® GF/PVDF  
Polyvinylidene difluoride syringe filters with glass fiber prefilters  
Features  

GF/PVDF
Hydrophilic membrane
Recommended for filtration of biological samples with high particle loads
Suited for filtration of aqueous samples
  For polyvinylidene difluoride syringe filters without prefilter click here.
Click here for chemical resistance.

Ordering information
Color-coded polyvinylidene difluoride – glass fiber combi filters
Type Pore size Membrane Color code Standard pack BIGbox
  [µm] dia. [mm] top bottom Filters/pack REF Filters/pack REF
GF/PVDF-45/25 1.0/0.45 25 black white 100 729039 400 729039.400
                 

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