Description
Specifications Table
Product Name – Whatman Cellulose Filter Paper Grade 93
Quantity/Pack Size – 11cm (Pack of 100) | 12.5cm (Pack of 100) | 15cm (Pack of 10 packs of 100) | 58x58cm (Pack of 500) | 61x61cm (Pack of 500)
Form – Circular sheets
Grade – 93 (Medium retention, fast flow)
Application – General lab filtration, qualitative analysis, routine sample prep
Product Overview
Whatman Grade 93 filter paper is a high-performance cellulose filtration medium designed for general laboratory applications requiring a balance between flow rate and particle retention. Engineered with a medium retention capacity (approximately 10-15 cm), this acid-washed filter paper ensures minimal extractables while maintaining consistent filtration performance. The 100% pure cellulose composition provides excellent chemical compatibility with most aqueous and organic solvents, making it suitable for a wide range of analytical procedures. The paper’s smooth surface and uniform thickness (typically 180-190 cm) prevent fiber shedding during filtration, ensuring clean sample collection. Its fast flow rate (Herzberg value ~15 sec) reduces processing time without compromising filtration efficiency. The acid-washing treatment removes trace metals and other impurities, resulting in low ash content (<0.06%) for reliable analytical results. Available in multiple diameter options to accommodate various funnel sizes, this filter paper maintains dimensional stability even when wet. The consistent pore structure provides reproducible results across different batches, making it ideal for applications where standardization is critical.
FAQs
1. What is the particle retention range for Whatman Grade 93 filter paper?
This grade retains particles in the 10-15 micron range, making it suitable for medium-fine filtration applications where both flow rate and particle capture are important considerations.
2. Can this filter paper be used with organic solvents?
The cellulose composition provides good compatibility with most organic solvents including alcohols, ketones, and aliphatic hydrocarbons, though prolonged exposure to strong acids or oxidizing agents may affect performance.
3. How does the flow rate compare to other Whatman grades?
Grade 93 offers a faster flow rate than grades 40-42 but slower than grade 1, providing an optimal balance between filtration speed and particle retention for general laboratory use.
4. What is the recommended storage method for these filter papers?
Store in original packaging at room temperature (15-30C) in a dry environment, protected from direct sunlight and chemical vapors to maintain filtration performance.
5. Are there any special handling precautions for this grade?
While generally robust, avoid touching the filtration surface with bare hands as skin oils may affect performance; use clean forceps when handling for critical applications.
