Description

Specifications Table

Product Name – Whatman Grade 540 Cellulose Filter Paper
Quantity/Pack Size – 2.1CM (Pack of 100) | 2.4CM (Pack of 100) | 4.25CM (Pack of 100) | 5.5CM (Pack of 100) | 9CM (Pack of 100) | 11CM (Pack of 100) | 12.5CM (Pack of 100) | 15CM (Pack of 100) | 18.5CM (Pack of 100) | 24CM (Pack of 100) | 32CM (Pack of 100)
Form – Circular sheets
Grade – 540 (Hardened, high wet strength)
Application – General lab filtration, gravimetric analysis, air monitoring

Product Overview

Whatman Grade 540 cellulose filter paper is engineered for demanding laboratory applications requiring exceptional wet strength and chemical resistance. Made from high-purity cellulose fibers, this hardened filter paper maintains structural integrity even under aggressive filtration conditions, making it ideal for gravimetric analysis, air monitoring, and general-purpose lab filtration. Its fast flow rate ensures efficient processing without compromising particle retention, while the consistent pore structure guarantees reproducible results. The paper?s acid-hardened treatment enhances durability against solvents and corrosive substances, extending its usability across diverse protocols. Available in multiple diameters (2.1CM to 32CM), it accommodates various filtration setups, from small-scale experiments to bulk sample processing. The 100-sheet pack size balances cost-efficiency with convenience, reducing frequent reordering. Compatible with standard filtration apparatus, this grade meets stringent quality standards for research, industrial, and educational labs. Its low ash content (<0.06%) minimizes residue interference, ensuring purity in critical applications. Whether used for liquid clarification, particulate collection, or analytical testing, Whatman Grade 540 delivers reliability and precision, backed by decades of trusted performance in scientific workflows.

FAQs

1. What is the maximum temperature Whatman Grade 540 can withstand during filtration?

This filter paper can handle continuous exposure up to 120?C, with short-term tolerance up to 130?C, making it suitable for hot filtration processes.

2. Can this filter paper be used with organic solvents like acetone or methanol?

Yes, Grade 540 is chemically resistant to most organic solvents, including acetone, methanol, and mild acids, though prolonged exposure to strong oxidizing agents should be avoided.

3. How does the flow rate of Grade 540 compare to standard filter papers?

The hardened structure of Grade 540 provides a faster flow rate than untreated cellulose papers while maintaining high particle retention, balancing speed and efficiency.

4. Is this filter paper suitable for sterile filtration applications?

While Grade 540 is not pre-sterilized, it can be autoclaved at 121?C for 15 minutes for applications requiring sterility, provided the process is validated for your specific use.

5. What alternatives exist if I need a filter paper with higher particle retention?

For finer particle retention, consider Whatman Grade 42 (2.5?m) or Grade 5 (2.5?m), though these may have slower flow rates compared to Grade 540.