GD/X 25mm Syringe Filter, Glass Microfiber Filteration Medium, 0.45um (150 pcs)
Whatman SKU: 6894-2504

Whatman GD/X Glass Fiber (GF) Syringe Filters, 0.45 µm, 25 mm, 150/Pk - 6894-2504

Whatman pairs a borosilicate fiber depth layer with the finishing membrane inside every GD/X unit, a construction meant to process loads heavy enough to clog a conventional one-stage filter. Syringe filters replace the separate holder and vacuum apparatus of bulk filtration with a single disposable unit, eliminating cleaning between samples. The glass microfiber matrix delivers nominal retention as a depth medium while drawing aqueous samples through without preconditioning and resists chemical attack across diverse solvents. Polypropylene construction maintains a low-dead-volume internal flow path while keeping the sample chemically unaltered across the pass and presses snugly against the membrane during the pass. When chromatographic methods demand particle-free injections, the column stays clean from run to run, protecting method performance and column life.

Membrane Characteristics

• Extends filterable sample volume three to seven times versus unprotected media
• Resists adsorptive interaction with most common laboratory solvents and reagents
• Inert glass surface preserves sample pH and ionic strength throughout filtration
• Inorganic fiber composition resists biodegradation during extended holding or room-temperature storage
• Continuous glass fiber microstructure supports even flow distribution across the filter face

Housing Characteristics

• Housing tolerates elevated-temperature aqueous and solvent sample filtration up to about 80°C without softening.
• Stable across the full aqueous pH range in routine sample work
• Optimized internal geometry minimizes backpressure in service
• Plasticizer-free polyolefin construction keeps the fluid path clean

Filtering buffers, reagents, and aqueous samples keeps your preparation moving and consistent. Consistent aqueous clarification clears particulates without slowing your bench routine across the buffers and reagents your day-to-day prep depends on. Request blanket-order pricing on your routine filtration purchases, and the Tisch Scientific team will also pull together the paperwork.

For more information about chemical compatibility, please review our Chemical Compatibility Chart.

Burst Pressure (psi)

75psi

Connection Type

Luer-Lok/ Luer Slip

Construction

Polypropylene

Diameter

25mm

Filtration Area

4.6cm²

Holdup Volume

1.4ml

Material

Glass Micro Fiber

Maximum Operating Pressure

75psi

Maximum Operating Temperature (°C)

550°C

Pack Count

150

Pore Size (µm)

0.45

Prefilter (Yes/No)

Yes

Prefilter Material

Glass Microfiber (GMF)

Sterility

Nonsterile

Sterilization

Autoclavable 121°C

Volume Throughput (ml)

Up to 100ml

Wettability

Hydrophilic

• Viscous Fluids - Supports rapid processing of suspension cultures and lysates that quickly foul standard membrane filters alone.
• Suspension Culture - Depth filtration structure keeps shear stress low during harvest clarification, limiting cell lysis and contaminant release.
• Water Analysis - Delivers high retention efficiency for suspended solids in water quality testing, ensuring accurate environmental reporting.
• Coatings Quality Testing - Glass fiber's chemical inertness handles viscous, solvent-laden coating formulations without swelling or degrading.
• Heavy Metal Digests - Glass fiber removes undissolved particulates from acid-digested soil and water samples ahead of ICP and AAS analysis.
• QuEChERS Extract Prep - Clarifies lipid-laden produce extracts ahead of GC-MS pesticide residue analysis, preventing analytical column fouling.