Description
Specifications Table
Product Name – Whatman ME25/20 ST Membrane Filter
Quantity/Pack Size – 50MM, 0.45µM (Pack of 100)
Form – Circular membrane discs
Grade – Mixed cellulose esters (MCE)
Application – Sterile filtration, particle analysis, microbiology
Product Overview
The Whatman ME25/20 ST membrane filter is engineered for high-performance filtration in laboratory settings, combining mixed cellulose esters (MCE) for superior particle retention and flow rates. With a precise 0.45µm pore size, this filter effectively captures microorganisms, fine particulates, and contaminants while maintaining consistent throughput. The 50mm diameter ensures compatibility with standard filtration apparatus, making it versatile for routine lab protocols. Its smooth, uniform surface minimizes sample loss and ensures reliable results in critical applications. The membrane’s hydrophilic nature allows for rapid wetting and even distribution of aqueous solutions, reducing processing time. Each pack contains 100 individually wrapped filters to prevent cross-contamination and ensure sterility until use. Designed for durability, these filters resist chemical degradation from common solvents, acids, and bases, extending their utility across diverse experimental conditions. The white, grid-marked surface aids in colony counting and particulate visualization under microscopy. Whether used in gravity-fed or vacuum-assisted systems, the ME25/20 ST delivers consistent performance, making it a staple in research, quality control, and environmental testing labs.
FAQs
1. What is the chemical compatibility of Whatman ME25/20 ST filters?
These filters are compatible with most aqueous solutions, mild acids, and alcohols. Avoid prolonged exposure to strong acids, bases, or organic solvents like acetone, which may degrade the mixed cellulose ester matrix.
2. Can these filters be autoclaved for sterilization?
Yes, Whatman ME25/20 ST filters can be autoclaved at 121°C for 15–20 minutes. Ensure they are dry before autoclaving to prevent pore distortion from steam condensation.
3. How do I store unused filters to maintain their integrity?
Store the filters in their original packaging at room temperature (15–30°C) in a dry, dust-free environment. Avoid exposure to direct sunlight or humidity, which may compromise sterility or structural integrity.
4. Are these filters suitable for protein binding studies?
Mixed cellulose ester membranes like ME25/20 ST exhibit moderate protein binding. For low-binding applications, consider pre-wetting with a blocking agent (e.g., BSA) or opting for a dedicated low-protein-binding filter.
5. What alternatives exist for higher throughput applications?
For faster filtration, consider Whatman’s glass microfiber filters (e.g., GF/A) or nylon membranes (e.g., Nytran), which offer higher flow rates but may differ in particle retention profiles.
