Description
Specifications Table
Product Name – Whatman Grade 42 Cellulose Filter Paper
Quantity/Pack Size – 4.25CM (Pack of 100), 4.7CM (Pack of 100), 5.5CM (Pack of 100), 7CM (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), 2.54x9CM (Pack of 100), 46x57CM (Pack of 100)
Form – Circular/Sheet
Grade – Medium Retention (2.5?m)
Application – General lab filtration, qualitative analysis, particle collection
Product Overview
Whatman Grade 42 cellulose filter paper is a high-performance filtration medium designed for routine laboratory applications requiring medium particle retention. With a nominal retention of 2.5?m, this grade offers an optimal balance between flow rate and filtration efficiency, making it suitable for a wide range of qualitative analyses. The pure cellulose composition ensures minimal extractables, guaranteeing sample integrity during filtration processes. Its consistent thickness and uniform pore structure provide reliable performance across various filtration tasks, from particle collection to solution clarification. The paper’s high wet strength prevents tearing during use, while its natural hydrophilicity ensures rapid wetting and even liquid distribution. Available in multiple diameters and sheet formats, Whatman Grade 42 adapts to diverse filtration setups, including Buchner funnels and gravity filtration systems. The medium retention capability effectively captures fine particulates while maintaining satisfactory flow rates, reducing filtration time without compromising results. This filter paper undergoes strict quality control to ensure batch-to-batch consistency, meeting the demanding standards of research and educational laboratories. Its versatility extends to both aqueous and organic solvent-based filtrations, though compatibility should be verified for specific solvent applications. The acid-washed treatment enhances purity levels, making it particularly suitable for applications where trace contaminants could interfere with analytical results.
FAQs
1. What is the particle retention capacity of Whatman Grade 42 filter paper?
Whatman Grade 42 filter paper has a nominal particle retention of 2.5?m, making it suitable for medium-level filtration requirements where both flow rate and particle capture are important considerations.
2. Can this filter paper be used with organic solvents?
While Whatman Grade 42 is compatible with many organic solvents, its performance may vary depending on the specific solvent and application. The paper’s cellulose composition generally provides good chemical resistance, but prolonged exposure to aggressive solvents may affect its structural integrity.
3. How does the flow rate of Grade 42 compare to other Whatman grades?
Grade 42 offers a faster flow rate than high-retention grades like Grade 41 but slower than coarse filtration grades such as Grade 1. This balance makes it particularly effective for applications requiring moderate particle retention without excessive filtration time.
4. What storage conditions are recommended for maintaining filter paper quality?
Store the filter paper in its original packaging at room temperature in a dry environment. Avoid exposure to direct sunlight or moisture, as these conditions can degrade the paper’s filtration properties over time. Proper storage ensures the paper maintains its specified retention characteristics.
5. Are there any special handling requirements for this filter paper?
Handle the filter paper with clean, dry forceps to prevent contamination. Avoid touching the filtration surface directly with bare hands, as oils and residues can affect filtration performance. For critical applications, consider wearing gloves during handling to maintain sample purity.
