Description
Specifications Table
Product Name – Whatman Grade 41 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 – 41 (Fast Flow, High Wet Strength)
Application – General lab filtration, qualitative analysis
Product Overview
Whatman Grade 41 FF is a premium quadrant-fold filter paper engineered for fast, efficient filtration in laboratory settings. Made from high-purity cellulose fibers, it delivers a superior flow rate while maintaining excellent wet strength?ideal for applications requiring rapid separation without fiber shedding. The quadrant-fold design maximizes surface area, ensuring optimal particle retention (90% at 20-25 ?m) and consistent performance. This grade is chemically resistant to most acids and alkalis, making it versatile for a wide range of qualitative analyses. The smooth surface minimizes sample loss, while the uniform thickness guarantees reproducibility. Whether used for routine filtration or critical separations, Whatman Grade 41 FF provides reliability and precision, backed by Whatman?s legacy of quality. Its high loading capacity reduces clogging, saving time in high-volume workflows. The filter paper is pre-folded for convenience, eliminating the need for manual preparation and reducing contamination risks. Trusted by labs worldwide, this grade combines speed, durability, and purity for demanding filtration tasks.
FAQs
1. What is the flow rate of Whatman Grade 41 FF compared to other grades?
Whatman Grade 41 FF offers a fast flow rate, approximately 3-4 times quicker than standard qualitative grades like Grade 1, due to its larger pore size and optimized fiber structure. This makes it ideal for applications where speed is critical without compromising particle retention.
2. Can this filter paper be used with organic solvents?
Yes, Whatman Grade 41 FF is compatible with most organic solvents, including alcohols, ketones, and hydrocarbons, though prolonged exposure to strong oxidizing agents may degrade the cellulose. For aggressive solvents, consider PTFE-based alternatives.
3. How does the quadrant fold design improve filtration efficiency?
The quadrant fold increases the effective filtration area by 4x compared to flat sheets, reducing clogging and improving throughput. It also directs particles toward the center, preventing edge bypass and ensuring uniform sample distribution.
4. What is the maximum temperature this filter paper can withstand?
Whatman Grade 41 FF can withstand continuous use up to 120?C in dry conditions and brief exposure to 130?C. Autoclaving at 121?C is possible for sterilization, but avoid prolonged steam exposure to prevent fiber weakening.
5. Are there alternatives for finer particle retention?
For finer particles (below 10 ?m), consider Whatman Grade 42 (2.5 ?m retention) or Grade 541 (2-5 ?m). These grades sacrifice flow speed for higher precision but are less suitable for high-volume filtration.
