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Syrups, sludges, and thick samples p. 10


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Syrups, sludges, and thick samples p. 10

Processes more sample with less back pressure*

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Description

High-particulate, challenging sample filtration: Whatman GD/X filters


Filter even the most difficult samples and use less hand pressure with GD/X syringe filters.

  • Exceptional loading capacity and fast flow rates – prevents back pressure and clogging of membrane
  • Graduated microfiber prefilter from 1 μm to 0.7 μm
  • Higher flow rates (3×) compared to unprotected membranes
  • Uses glass microfiber-based prefilters

For metals testing and other applications where glass-based compounds could interfere with analysis, we offer a related syringe filter (GD/XP), which uses polypropylene prefilters.

Typical data

Whatman GD/X Syringe Filters
Membrane GD/X 13 mm GD/X 25 mm
Housing Polypropylene

(pigment-free)

 Polypropylene

(pigment-free)
Filtration area 1.3 cm2 4.6 cm2
Maximum pressure 100 psi (6.9 bar) 75 psi (5.2 bar)
Volume “hold-up” full

housing with air purge

 0.5 ml

50 μl (approx)

 1.4 ml

250 μl (approx)
Dimensions 21.6 × 29.8 mm 20.8 × 29.8 mm
Weight 3 g (approx) 3 g (approx)
Flow direction Flow should enter

from the inlet

 Flow should enter

from the inlet
Inlet connection Female Luer lock Female Luer lock
Outlet connection Male Luer Male Luer
Sterilization* Autoclave at 121°C at 15 psi for 20 min Autoclave at 121°C at 15 psi for 20 min
Glass microfiber

prefiltration media

 100% borosilicate

GMF 150:

1 μm GF/F 0.7 μm

 100% borosilicate

GMF 150:

1 μm GF/F 0.7 μm

* Applies to nonsterile filters only. Do not autoclave sterile GD/X filters.

Typical data

GD/XP Syringe Filters
GD/X 25 mm
Housing Polypropylene

(pigment-free)
Filtration area 4.6 cm2
Maximum pressure 75 psi (5.2 bar)
Volume “hold-up” full

housing

 1.4 ml with air purge 250 μl (approx)
Dimensions 20.8 × 30.0 mm
Weight 3 g (approx)
Flow direction Flow should enter

from the inlet
Inlet connection Female Luer lock
Outlet connection Male Luer
Sterilization* Autoclave at 121°C at 15 psi for 20 min
Prefiltration media PP 20 μm: 5 μm

† Not recommended for nylon.


Whatman GD/X Syringe filters contain several filtration layers that substantially reduce blockage and increase volume throughput.

GD/XP Syringe Filters

Product code Membrane* Pore size (μm) Diameter (mm) Hydrophilic Solvent resistance Quantity/pack
6970-2504 Nylon 0.45 25 Yes Good 150
6971-2504 Nylon 0.45 25 Yes Good 1500
6972-2504 PVDF 0.45 25 Yes Good 150
6973-2504 PVDF 0.45 25 Yes Good 1500
6974-2504 PTFE 0.45 25 No Very good 150
6978-2504 PP 0.45 25 No Good 150
6993-2504 DpPP 0.45 25 No Good 1500
6992-2504 DpPP 0.45 25 No Good 150
6994-2504 PES 0.45 25 Yes Poor 150
6995-2504 PES 0.45 25 Yes Poor 1500

* PP = Polypropylene; PES = Polyethersulfone; PVDF = Polyvinylidene difluoride; PTFE = Polytetrafluoroethylene; DpPP = Polypropylene depth filter

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