Description
Specifications Table
Product Name – Whatman MP21 ST Membrane Filter
Quantity/Pack Size – 47MM, 0.45uM (Pack of 100) | 50MM, 0.45uM (Pack of 100)
Form – Circular Membrane Disc
Grade – Sterile, Mixed Cellulose Ester (MCE)
Application – Liquid & Gas Filtration, Sterilization
Product Overview
The Whatman MP21 ST Membrane Filter is a high-performance filtration solution engineered for precision and reliability in laboratory environments. Crafted from mixed cellulose esters (MCE), this filter combines mechanical strength with chemical compatibility, making it suitable for a wide range of sterile filtration tasks. The 0.45?m pore size ensures efficient retention of microorganisms, particles, and contaminants, while maintaining optimal flow rates for liquids and gases. Each filter undergoes rigorous quality control to guarantee sterility and consistency, eliminating the risk of sample cross-contamination. The hydrophobic surface treatment enhances wetting properties, ensuring uniform filtration without clogging. Available in standard 47MM and 50MM diameters, these filters are compatible with most filtration apparatus, including syringe filters, vacuum manifolds, and pressure filtration systems. The white, grid-marked surface allows for easy particle visualization under microscopy, aiding in qualitative analysis. With low extractables and minimal protein binding, the MP21 ST is ideal for applications requiring high purity, such as buffer sterilization, solvent clarification, and environmental monitoring. The pack of 100 ensures cost-effective bulk usage for high-throughput labs, while the sterile packaging preserves integrity until use.
FAQs
1. What is the material composition of the Whatman MP21 ST Membrane Filter?
The filter is made from mixed cellulose esters (MCE), a blend of cellulose acetate and cellulose nitrate, offering balanced chemical resistance and filtration efficiency.
2. Can this filter be used for both aqueous and organic solvent filtration?
Yes, the MP21 ST is compatible with a broad range of aqueous solutions and organic solvents, though compatibility should be verified for highly aggressive solvents.
3. How should these filters be stored to maintain sterility?
Store the filters in their original sealed packaging at room temperature (15?30?C) in a dry, clean environment away from direct sunlight and moisture.
4. Is there a non-sterile version of this filter available?
The MP21 ST is pre-sterilized via gamma irradiation; non-sterile alternatives would require separate autoclaving or alternative membrane types.
5. What is the typical shelf life of these filters?
When stored under recommended conditions, the filters retain their performance and sterility for up to 5 years from the date of manufacture.
