Description
Specifications Table
Product Name – Whatman ME25/20 STL Membrane Filter
Quantity/Pack Size – 50MM, 0.45µM (Pack of 400)
Form – Membrane Disc
Grade – Mixed Cellulose Esters (MCE)
Application – Sterile filtration, particle retention, microbial analysis
Product Overview
The Whatman ME25/20 STL Membrane Filter is engineered for high-performance filtration in demanding laboratory applications. Constructed from mixed cellulose esters (MCE), this 0.45µm pore-size membrane delivers exceptional particle retention while maintaining high flow rates, making it ideal for sterile filtration and microbial analysis. Its uniform pore structure ensures consistent results, while the robust MCE composition provides compatibility with a wide range of solvents and aqueous solutions. The 50mm diameter offers ample surface area for efficient processing, and the white, grid-marked surface facilitates easy particle visualization under microscopy. Designed for durability, these filters resist tearing and deformation during handling or autoclaving. The hydrophobic nature of the membrane prevents premature wetting, ensuring reliable performance in both manual and automated systems. Each pack contains 400 filters, providing cost-effective bulk supply for high-throughput laboratories. The Whatman ME25/20 STL combines precision engineering with practical design features, including a smooth surface that minimizes sample loss and a sterile packaging format that maintains integrity until use.
FAQs
1. What materials are used in the Whatman ME25/20 STL membrane composition?
The membrane is made from mixed cellulose esters, a blend of cellulose acetate and cellulose nitrate, offering balanced chemical resistance and filtration efficiency.
2. Can these filters be autoclaved for sterilization?
Yes, the Whatman ME25/20 STL filters can withstand standard autoclaving procedures at 121°C for 15 minutes without compromising structural integrity.
3. What is the maximum operating temperature for these membranes?
The filters maintain performance up to 135°C in dry conditions, though prolonged exposure above 120°C may affect mechanical strength.
4. How should these filters be stored to maintain shelf life?
Store in original packaging at room temperature (15-30°C) in a dry environment, away from direct sunlight and volatile chemicals.
5. Are there compatible filter holders for this 50mm diameter size?
This membrane fits standard 50mm filter holders including stainless steel, glass, or plastic units with appropriate sealing gaskets.
