Description
Specifications Table
| Product Name | Whatman Cellulose Filter Paper Grade 91 | 1091-110 |
|---|---|
| Pack Size | 11.0cm (Pack of 4000), 12.5cm (Pack of 4000), 15cm (Pack of 1000), 16.5cm (Pack of 1000), 18.5cm (Pack of 1000), 19cm (Pack of 1000), 24cm (Pack of 1000), 58x58cm (Pack of 500), 61x61cm (Pack of 500) |
| Form | Circular sheets |
| Grade | 91 |
| Application | General lab filtration, routine analysis, sample preparation |
Product Description
When precision meets practicality in the lab, Whatman Grade 91 filter paper stands out as a trusted choice for researchers, students, and educators alike. Engineered from high-purity cellulose, this filter paper balances speed and retention, making it ideal for a wide range of filtration tasks. Whether you’re clarifying solutions, preparing samples, or conducting routine analyses, Grade 91 delivers consistent performance without compromising on quality.
The medium retention rate of Grade 91 ensures efficient filtration of coarse to medium particles, while its fast flow rate saves valuable time in busy labs. Unlike slower grades, this filter paper minimizes clogging, allowing for smoother workflows and reliable results. It’s no wonder that Whatman Grade 91 is a staple in academic and research settings across India.
At eqipped, we understand the importance of having the right tools for your experiments. That’s why we offer Grade 91 filter paper in multiple sizes, from compact 11.0cm circles for small-scale work to large 61x61cm sheets for industrial applications. Each pack is designed to meet the demands of modern laboratories, ensuring you always have the right filter on hand.
Upgrade your lab filtration today with Whatman Grade 91 filter paper. Order now and experience the difference quality makes.
One of the key advantages of Grade 91 is its versatility. It’s commonly used in environmental testing, food and beverage analysis, and educational demonstrations. The cellulose composition ensures compatibility with a variety of solvents, making it suitable for both aqueous and organic filtrations. Plus, the uniform thickness and porosity guarantee reproducible results, batch after batch.
For students and educators, this filter paper serves as an excellent teaching tool. Its predictable performance helps illustrate fundamental filtration principles, while its affordability makes it accessible for classroom use. Researchers, on the other hand, appreciate its reliability in critical applications where consistency is non-negotiable.
When you buy Whatman filter paper 91 from eqipped, you’re not just purchasing a product—you’re investing in a solution that has been trusted by scientists for decades. Our commitment to quality means you receive genuine Whatman products, packaged to maintain their integrity until they reach your lab.
Why Grade 91 Stands Out
Unlike generic filter papers that may vary in performance, Whatman Grade 91 is manufactured to strict quality standards. The cellulose fibers are carefully processed to achieve a balance between particle retention and flow rate, ensuring you don’t have to sacrifice one for the other. This makes it particularly useful in applications where time is of the essence, such as high-throughput screening or time-sensitive experiments.
The filter paper’s natural cellulose composition also means it’s free from binders or additives that could interfere with your results. This purity is especially important in analytical chemistry, where even trace contaminants can skew data. With Grade 91, you can filter with confidence, knowing your samples remain uncontaminated.
Choosing the Right Size
Selecting the appropriate filter size is crucial for efficient filtration. Smaller diameters like 11.0cm or 12.5cm are perfect for test tubes and small funnels, while larger sizes such as 24cm or 58x58cm sheets are better suited for bulk filtration or custom applications. The pack sizes are optimized to reduce waste, so you only use what you need without compromising on availability.
Need help selecting the right size for your application? Our team at eqipped is here to guide you. Shop now and get expert advice with your purchase.
Applications in Real-World Labs
In environmental labs, Grade 91 is often used to filter water samples before analysis, removing suspended solids that could interfere with testing. Food technologists rely on it to clarify extracts and separate components during quality control. Even in pharmaceutical research, this filter paper plays a role in early-stage drug development, where purity and consistency are paramount.
Educators find it invaluable for demonstrating filtration techniques to students. Its predictable behavior makes it easy to explain concepts like particle size exclusion and flow dynamics. Whether you’re setting up a simple experiment or a complex protocol, Grade 91 adapts to your needs.
Storage and Handling Tips
To maintain the performance of your Whatman filter paper, store it in a cool, dry place away from direct sunlight. Avoid touching the surface with bare hands, as oils and moisture can affect filtration efficiency. When handling, use clean forceps or wear gloves to preserve the paper’s integrity.
If you’re working in humid environments, consider storing the filter paper in a desiccator to prevent moisture absorption. This simple step can extend the shelf life and ensure consistent results, even in challenging conditions.
Grade 91 filter paper has a medium retention rate, typically capturing particles larger than 10-12 microns. This makes it suitable for general-purpose filtration where fine particles aren’t a primary concern.
Can I use Grade 91 filter paper for both aqueous and organic solvents?
Yes, the high-purity cellulose composition of Grade 91 is compatible with a wide range of solvents, including water, alcohols, and many organic solutions. Always verify compatibility for specific solvents in your protocol.
How does Grade 91 compare to other Whatman filter papers?
Grade 91 offers a faster flow rate than finer grades like 41 or 42 but retains more particles than coarser grades such as 1. It’s ideal for applications where speed and moderate retention are both important.
Is this filter paper suitable for sterile filtration?
No, Grade 91 is not designed for sterile filtration. For aseptic applications, consider using membrane filters or pre-sterilized filter units specifically rated for microbial retention.
Where can I buy Whatman Grade 91 filter paper in India?
You can purchase genuine Whatman Grade 91 filter paper online at eqipped. We offer competitive pricing, fast shipping, and expert support to ensure you get the right product for your needs.
