Description
Specifications Table
Product Name – Whatman Grade 40 FF Quadrant Fold Filter Paper
Quantity/Pack Size – 110MM (Pack of 500), 125MM (Pack of 500), 150MM (Pack of 500)
Form – Quadrant-folded sheets
Grade – 40 (Fast flow, medium retention)
Application – General filtration, qualitative analysis, particle retention
Product Overview
Whatman Grade 40 FF quadrant-fold filter paper is engineered for high-efficiency filtration in laboratory settings, offering a balanced combination of flow rate and particle retention. Constructed from 100% pure cellulose, this grade ensures minimal extractables and consistent performance across a wide pH range (0?12), making it compatible with most aqueous and organic solvents. The quadrant-fold design maximizes surface area, accelerating filtration while maintaining structural integrity even under wet conditions. With a nominal particle retention of 8 ?m, it effectively captures fine particulates without premature clogging, reducing processing time. The paper?s uniform thickness and porosity provide reproducible results, critical for quantitative and qualitative analyses. Its high wet strength prevents tearing during handling, while the acid-washed treatment minimizes interference in sensitive applications. Whether used in gravity or vacuum filtration setups, Grade 40 FF delivers reliability for routine and specialized procedures, from sample clarification to solvent purification. The pack includes 500 pre-folded sheets, ensuring long-term supply for high-throughput labs.
FAQs
1. What is the particle retention capacity of Whatman Grade 40 FF filter paper?
This filter paper has a nominal particle retention of 8 ?m, making it suitable for applications requiring medium retention with fast flow rates.
2. Can this filter paper be used with organic solvents like acetone or ethanol?
Yes, Whatman Grade 40 FF is compatible with most organic solvents, including acetone, ethanol, and methanol, due to its chemical resistance and pure cellulose composition.
3. How does the quadrant-fold design improve filtration efficiency?
The quadrant-fold increases the effective surface area, allowing for faster filtration by distributing the sample evenly across the paper while maintaining structural stability.
4. Is this filter paper autoclavable for sterile applications?
While Grade 40 FF can withstand autoclaving, it is primarily designed for general filtration. For sterile applications, consider pre-sterilized or dedicated sterile-grade filters.
5. What alternatives are available if I need finer particle retention?
For finer retention, Whatman Grade 41 (20?25 ?m) or Grade 42 (2.5 ?m) are recommended, depending on the specific particle size requirements of your application.
