Description
Specifications Table
Product Name – Whatman Grade QMB Quartz Microfibre Filter
Quantity/Pack Size – 40MM (Pack of 50) | 42MM (Pack of 50)
Form – Circular discs
Grade – QMB (Quartz Microfibre, binder-free)
Application – High-temperature filtration, gravimetric analysis, particulate collection, air/stack monitoring
Product Overview
Whatman Grade QMB Quartz Microfibre Filters are engineered for demanding laboratory applications requiring superior thermal and chemical resistance. Composed of 100% pure quartz fibres without binders or additives, these filters maintain structural integrity even at temperatures up to 1000?C, making them indispensable for high-temperature filtration processes. The inherent chemical inertness ensures compatibility with aggressive acids, alkalis, and organic solvents, while the fine fibre matrix provides efficient particulate retention down to sub-micron levels. Unlike glass fibre alternatives, QMB filters exhibit negligible weight loss during ignition, delivering precise results in gravimetric analysis where accuracy is paramount. The smooth surface and uniform pore structure minimize particle bounce-off, enhancing collection efficiency for airborne particulates in environmental monitoring. Each filter undergoes rigorous quality control to guarantee consistent performance across batches, with lot-specific certification available for traceability. The binder-free construction eliminates background interference in analytical techniques like ICP or AA spectroscopy, while the hydrophobic nature reduces moisture absorption during sampling. Whether used in stack emissions testing, workplace air quality assessment, or research-grade filtration, these filters combine durability with analytical reliability. The standard 40mm and 42mm diameters fit most filtration apparatuses, and the pack of 50 ensures cost-effective supply for frequent users. For applications demanding absolute purity and thermal stability, Whatman QMB filters represent the gold standard in quartz microfibre filtration technology.
FAQs
1. What is the maximum operating temperature for Whatman QMB filters?
These quartz microfibre filters can withstand continuous operation at temperatures up to 1000?C without structural degradation or significant weight loss.
2. Are these filters compatible with strong acids and organic solvents?
The 100% quartz composition makes them resistant to most acids (including hydrofluoric acid), alkalis, and organic solvents, though prolonged exposure to concentrated HF may cause gradual degradation.
3. How do QMB filters compare to glass fibre filters for gravimetric analysis?
QMB filters offer superior thermal stability and lower background weight compared to glass fibre, resulting in more accurate gravimetric measurements, especially when ashing is required.
4. What particle retention efficiency can be expected with these filters?
The fine quartz fibre matrix provides >99.9% retention for particles larger than 0.3 microns, with efficient capture of sub-micron particulates due to the dense fibre structure.
5. Do these filters require any special storage conditions?
Store in original packaging at room temperature in a dry environment; avoid exposure to high humidity which could temporarily affect the hydrophobic properties until dried.
