Description
Specifications Table
Product Name – Whatman Grade GF8 Glass Microfibre Filter
Quantity/Pack Size – 47MM (Pack of 200), 90MM (Pack of 100), 200MM (Pack of 100), 60x90MM (Pack of 100)
Form – Circular/Rectangular Sheets
Grade – GF8 (Glass Microfibre)
Application – Air/Water Monitoring, Gravimetric Analysis, General Filtration
Product Overview
The Whatman Grade GF8 Glass Microfibre Filter is engineered for high-efficiency particulate retention while maintaining a fast flow rate, making it a versatile choice for demanding laboratory applications. Constructed from 100% borosilicate glass microfibres, these filters exhibit exceptional chemical resistance and thermal stability, ensuring reliable performance even under harsh conditions. The GF8 grade is specifically designed to capture fine particles down to 0.3 ?m, making it suitable for critical filtration tasks where precision is paramount. Unlike cellulose-based filters, glass microfibre filters do not absorb moisture, which eliminates variability in weight measurements during gravimetric analysis. Their inert nature ensures no interference with analytical results, providing consistent and reproducible data. The uniform fibre distribution across the filter surface promotes even particle retention, reducing the risk of clogging and extending filter life. Available in multiple diameters and rectangular formats, these filters adapt seamlessly to various filtration setups, from standard funnel-based systems to high-volume air sampling equipment. The absence of binders or additives further enhances their purity, making them compatible with a wide range of solvents and reagents. Whether used in environmental monitoring, industrial process control, or routine lab procedures, the Whatman GF8 delivers uncompromising performance with minimal maintenance requirements.
FAQs
1. What is the maximum operating temperature for Whatman GF8 filters?
Whatman GF8 glass microfibre filters can withstand continuous operation at temperatures up to 500?C, making them suitable for high-temperature applications like ashing procedures or thermal gravimetric analysis. Their borosilicate composition ensures dimensional stability even under extreme heat.
2. Can these filters be used with acidic or alkaline solutions?
The GF8 filters exhibit excellent chemical resistance to most acids and alkalis, including hydrochloric acid, sulfuric acid, and sodium hydroxide solutions. However, prolonged exposure to hydrofluoric acid should be avoided as it can degrade the glass fibres over time.
3. How does the GF8 compare to GF/A or GF/C grades in terms of flow rate?
Among Whatman’s glass microfibre series, GF8 offers the fastest flow rate due to its larger pore size (0.3 ?m retention) compared to GF/A (1.6 ?m) and GF/C (1.2 ?m). This makes it particularly effective for applications requiring rapid filtration without sacrificing particle retention efficiency.
4. Are these filters suitable for sterile filtration applications?
While GF8 filters provide excellent particulate retention, they are not designed for sterile filtration as they do not meet the 0.2 ?m pore size requirement for bacterial retention. For sterile applications, consider using membrane filters with appropriate pore sizes.
5. What is the typical pressure drop across a GF8 filter during operation?
The pressure drop across a Whatman GF8 filter varies depending on the application and flow rate, but under standard conditions with clean air or water, it typically ranges between 1-5 kPa at moderate flow rates. The pressure drop will increase as the filter loads with particles during use.
