Description
Specifications Table
Product Name – Whatman MP31 STL Membrane Filter
Quantity/Pack Size – 47MM, 0.45uM (Pack of 400) | 50MM, 0.45uM (Pack of 400)
Form – Membrane Disc
Grade – Hydrophilic PTFE
Application – Sterile Filtration, Clarification, Particle Removal
Product Overview
The Whatman MP31 STL membrane filter is engineered for high-performance filtration in laboratory settings, combining durability with exceptional flow rates. Constructed from hydrophilic polytetrafluoroethylene (PTFE), this filter ensures broad chemical compatibility, making it suitable for aggressive solvents, acids, and bases. The 0.45?m pore size effectively retains bacteria and fine particulates while maintaining high throughput, reducing processing time. Its low extractables and consistent pore structure guarantee reliable, reproducible results, critical for sensitive applications. The membrane?s inherent hydrophilicity eliminates the need for pre-wetting, streamlining workflows. Available in 47MM and 50MM diameters, each pack contains 400 discs, providing cost-effective bulk options for high-volume labs. The filter?s thermal stability (up to 130?C) and mechanical strength ensure integrity under autoclaving or high-pressure conditions. Whether used for sterile filtration, clarification, or particle analysis, the MP31 STL delivers precision and efficiency, backed by Whatman?s reputation for quality in filtration technology.
FAQs
1. What is the chemical resistance range of the Whatman MP31 STL membrane?
The hydrophilic PTFE material resists most organic solvents, strong acids, and bases, including hydrochloric acid, sodium hydroxide, and dimethyl sulfoxide, ensuring versatility across applications.
2. Can this filter be autoclaved before use?
Yes, the MP31 STL membrane withstands autoclaving at 121?C for 20 minutes without compromising structural integrity or filtration performance.
3. How does the 0.45?m pore size compare to other common sizes for sterile filtration?
A 0.45?m rating is the standard for retaining most bacteria and yeast while allowing faster flow rates than 0.22?m filters, which are typically used for sterilizing liquids.
4. Is pre-wetting required for this hydrophilic PTFE membrane?
No, the membrane?s hydrophilic treatment eliminates the need for pre-wetting with alcohol or other solvents, simplifying the filtration process.
5. What alternatives exist if I need a different pore size or material?
For finer filtration, consider Whatman?s 0.22?m PTFE membranes. For non-aqueous solutions, hydrophobic PTFE or nylon membranes may be suitable, depending on chemical compatibility requirements.
