Description
Specifications Table
Product Name – Whatman Grade 41 Cellulose Filter Paper
Quantity/Pack Size – 4.25CM (Pack of 100), 4.7CM (Pack of 100), 5CM (Pack of 100), 5.5CM (Pack of 100), 6CM (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), 9MMx50M (Pack of 1), 20.3×25.4CM (Pack of 100), 46x57CM (Pack of 100)
Form – Circular sheets, rolls
Grade – 41 (Medium retention, 20-25?m)
Application – General lab filtration, qualitative analysis, routine sample prep
Product Overview
Whatman Grade 41 is a versatile, medium-speed cellulose filter paper designed for general laboratory filtration tasks requiring reliable particle retention and consistent flow rates. Manufactured from high-purity cotton linters, this grade offers a nominal retention of 20-25?m, making it suitable for applications where moderate particle separation is needed without sacrificing filtration speed. The paper’s uniform thickness and smooth surface ensure even particle distribution, while its acid-washed treatment minimizes extractables, preserving sample integrity. Its medium retention capability balances between fine particle capture and efficient liquid throughput, reducing clogging risks in routine procedures. The cellulose composition provides excellent chemical compatibility with most aqueous and organic solvents, though it is not recommended for strong acids or oxidizing agents. Available in multiple diameters and roll formats, Grade 41 adapts to various filtration setups, from standard funnels to specialized apparatus. Its consistent performance across batches makes it a dependable choice for repetitive laboratory processes where reproducibility is critical. The paper’s natural cellulose fibers are free from binders or additives, ensuring minimal interference with analytical results. While not designed for sterile applications, its high purity makes it suitable for preparative work where contamination control is important.
FAQs
1. What is the particle retention range for Whatman Grade 41 filter paper?
The nominal particle retention for Grade 41 is between 20-25 microns, making it effective for general filtration tasks where moderate particle separation is required.
2. Can this filter paper be used with organic solvents?
Grade 41 is compatible with most common organic solvents, though prolonged exposure to strong acids or oxidizing agents may compromise its integrity.
3. How does the flow rate compare to other Whatman grades?
Grade 41 offers a medium flow rate, faster than fine retention grades like 42 but slower than coarse grades such as 1, making it suitable for routine filtration needs.
4. Is this filter paper pre-sterilized?
No, Whatman Grade 41 is not pre-sterilized and is intended for general laboratory use rather than sterile applications.
5. What is the recommended storage condition for these filter papers?
Store in a cool, dry environment away from direct sunlight and chemical vapors to maintain performance and prevent contamination.
