Description
Specifications Table
Product Name – Whatman Grade GF9 Glass Microfibre Filter
Quantity/Pack Size – 50MM (Pack of 200), 90MM (Pack of 100), 110MM (Pack of 100)
Form – Circular discs
Grade – GF9
Application – Air/gas filtration, gravimetric analysis, liquid clarification
Product Overview
Whatman Grade GF9 glass microfibre filters are engineered for superior performance in demanding laboratory environments. Constructed from 100% borosilicate glass microfibres, these filters provide exceptional thermal stability up to 500?C and outstanding chemical resistance to acids, alkalis, and organic solvents. The GF9 grade features a nominal particle retention of 0.7?m, making it ideal for applications requiring fine particle filtration without sacrificing flow rates. The binder-free composition ensures minimal extractables, guaranteeing sample purity in critical analyses. Each filter maintains consistent thickness and porosity, delivering reproducible results across multiple experiments. The smooth surface minimizes particle shedding, while the high loading capacity reduces frequent filter changes. These filters are particularly effective in air and gas filtration systems where sub-micron particle capture is essential. The inert nature of glass microfibres prevents interaction with filtered substances, maintaining sample integrity. Available in standard diameters, these filters integrate seamlessly with most filtration apparatus. Their robust construction allows for autoclaving and repeated use in many applications, offering both reliability and cost-effectiveness for laboratory operations.
FAQs
1. What is the maximum operating temperature for Whatman GF9 filters?
These filters can withstand continuous operation at temperatures up to 500?C, making them suitable for high-temperature applications.
2. Can GF9 filters be used with strong acids and bases?
The glass microfibre composition provides excellent chemical resistance to most acids and alkalis, though prolonged exposure to hydrofluoric acid should be avoided.
3. How does GF9 compare to other Whatman glass microfibre grades?
GF9 offers finer particle retention than GF/A but coarser than GF/F, providing a balance between filtration efficiency and flow rate for general laboratory use.
4. What is the typical pressure drop across a GF9 filter?
The pressure drop varies with application but generally remains low due to the filter’s optimized porosity and fibre structure.
5. Are these filters suitable for sterile filtration?
While GF9 filters can be autoclaved, they are not typically used for sterile filtration as they lack the absolute retention ratings required for sterilization applications.
