Description
Specifications Table
Product Name – Whatman Grade 4 Cellulose Filter Paper
Quantity/Pack Size – 2.7CM (Pack of 400), 41MM (Pack of 100), 4.25CM (Pack of 100), 4.7CM (Pack of 100), 5CM (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), 27CM (Pack of 100), 32CM (Pack of 100), 40CM (Pack of 100), 46x57CM (Pack of 100), 58x58CM (Pack of 100)
Form – Circular sheets
Grade – Medium retention (20-25m)
Application – General-purpose lab filtration, qualitative analysis
Product Overview
Whatman Grade 4 cellulose filter paper is engineered for reliable filtration performance in laboratory environments, combining a fast flow rate with medium particle retention capabilities. Composed of 98% pure alpha-cellulose, this filter paper maintains chemical resistance while ensuring consistent filtration results. The medium retention grade (20-25m) makes it particularly effective for capturing fine particulates without compromising flow efficiency, reducing clogging during extended use. The uniform porosity and high wet strength of Grade 4 paper provide structural integrity even when saturated, preventing fiber shedding that could contaminate samples. Its natural hydrophilicity ensures rapid wetting and even liquid distribution across the filter surface, optimizing filtration speed. The paper undergoes stringent quality control to eliminate extractables, making it suitable for applications requiring high purity standards. Available in a comprehensive range of diameters from 2.7cm to 58x58cm, this filter paper adapts to various filtration setups, including B?chner funnels and gravity filtration systems. The consistent thickness and smooth surface minimize particle bypass while maintaining high loading capacity. Its neutral pH and low ash content (0.06%) further enhance its suitability for sensitive analytical procedures. The filter paper’s thermal stability allows for autoclaving at standard lab conditions, ensuring sterility when required. Its compatibility with most organic solvents and aqueous solutions expands its utility across diverse filtration protocols. The pre-cut circular format eliminates preparation time, while the pack sizes cater to both low-volume and bulk requirements. This combination of performance characteristics positions Whatman Grade 4 as a versatile filtration solution for routine laboratory applications where reliability and reproducibility are paramount.
FAQs
1. What is the particle retention range for Whatman Grade 4 filter paper?
This filter paper provides medium particle retention in the 20-25 micron range, making it suitable for capturing fine particulates while maintaining good flow rates.
2. Can this filter paper be used with organic solvents?
The cellulose composition offers compatibility with most common organic solvents and aqueous solutions, though prolonged exposure to strong acids or bases may affect performance.
3. How does the flow rate compare to other Whatman grades?
Grade 4 offers a faster flow rate than higher retention grades like Grade 1 but slower than very coarse grades like Grade 597, balancing speed and filtration efficiency.
4. What is the recommended storage condition for these filters?
Store in a cool, dry environment in the original packaging to prevent moisture absorption and contamination. Avoid exposure to direct sunlight or chemical vapors.
5. Are these filters suitable for sterile applications?
The paper can be autoclaved at standard lab conditions (121C, 15 psi) for 15-20 minutes to achieve sterility when required for microbiological applications.
