Specifications Table

Product Name – Whatman WME WHGR ST Membrane Filter
Quantity/Pack Size – Pack of 200
Form – Membrane Disc
Grade – GR (General Retention)
Application – Sterile filtration, particle removal, aqueous solutions
Diameter – 47mm
Pore Size – 0.45µm
Material – Mixed Cellulose Esters (MCE)
Hydrophilicity – Hydrophilic
Autoclavable – Yes (121°C, 15 min)

Product Overview

The Whatman WME WHGR ST Membrane Filter is engineered for high-performance filtration in laboratory settings, offering exceptional purity and consistency. Constructed from mixed cellulose esters (MCE), this hydrophilic membrane ensures rapid wetting and uniform flow rates, making it ideal for filtering aqueous solutions, buffers, and biological fluids. The 0.45µm pore size provides efficient retention of particles, bacteria, and fine precipitates while maintaining high throughput, reducing processing time without compromising integrity. Its GR-grade classification guarantees reliable retention standards, adhering to stringent lab protocols for sterile and non-sterile applications alike. The 47mm diameter disc format is compatible with most standard filtration assemblies, including syringe filters, vacuum manifolds, and pressure-driven systems, ensuring seamless integration into existing workflows. Autoclavable at 121°C for 15 minutes, these membranes support repeated sterilization cycles without degradation, extending their utility in repetitive or long-term experiments. The white, grid-marked surface enhances particle visibility during microscopy, aiding in qualitative analysis. Whether used for clarifying culture media, removing contaminants from reagents, or preparing samples for chromatography, this membrane filter delivers reproducible results with minimal extractables, preserving the integrity of sensitive analytes. Its balanced combination of mechanical strength, chemical resistance, and thermal stability makes it a versatile choice for diverse filtration challenges in research, quality control, and industrial laboratories.

FAQs

1. What is the maximum pressure the Whatman WME WHGR ST membrane can withstand during filtration?

This membrane is designed to handle differential pressures up to 4 bar (58 psi) in most standard filtration setups, though performance may vary based on the specific solvent and temperature conditions.

2. Can this filter be used with organic solvents like ethanol or acetone?

The WME WHGR ST membrane is primarily optimized for aqueous solutions. For organic solvents, consider Whatman’s PTFE or nylon membranes, which offer broader chemical compatibility.

3. How does the grid marking on the membrane assist in lab applications?

The grid pattern allows for easier visualization and counting of particles or colonies under a microscope, facilitating quantitative analysis in microbiological or particulate studies.

4. Is this filter compatible with automated filtration systems?

Yes, the 47mm diameter and standard thickness make it suitable for most automated and manual filtration devices, including vacuum pumps and syringe filter holders.

5. What storage conditions are recommended to maintain the filter’s performance?

Store the membranes in their original packaging at room temperature (15–30°C) in a dry environment. Avoid exposure to direct sunlight or humidity to prevent premature degradation.