Description
Product Overview
The Whatman 1001-325 filter paper circles are engineered to meet the demanding standards of quantitative laboratory filtration. Constructed from high‑purity cellulose fibers, each 25 mm diameter disc offers a uniform 11 µm pore size that guarantees reproducible flow rates and precise particle retention. The Grade 1 classification reflects the paper’s exceptional consistency, low ash content, and minimal background interference, making it a trusted choice for analytical protocols that require accurate quantitative results.
Designed for versatility, these circles are compatible with a wide range of filtration apparatus, including vacuum filtration units, gravity filtration setups, and handheld filter holders. The thin yet robust 0.16‑ounce sheets provide a balance of mechanical strength and ease of handling, reducing the risk of tearing during preparation and ensuring a smooth, uninterrupted filtration process. The product dimensions of 3 × 2 × 1 inches allow for compact storage, while the pack of 100 circles offers sufficient inventory for both routine laboratory work and high‑throughput screening projects.
Beyond the core specifications, the 1001‑325 series benefits from Whatman’s long‑standing reputation for quality control. Each batch undergoes rigorous testing for flow rate consistency, particle retention efficiency, and chemical compatibility, ensuring that researchers receive a reliable product that performs identically from one circle to the next. This level of uniformity is essential for experiments where subtle variations can impact data interpretation, such as colorimetric assays, gravimetric analyses, and microbiological filtrations.
![[Product front view showing all components]](https://www.galleryofart.store/wp-content/uploads/2026/07/3dbc6b69002d40cfa45507f4079afa46.jpg)
Usage
These filter paper circles excel in a variety of laboratory environments. In food industry laboratories, they are routinely employed to clarify juice extracts, remove particulate matter from dairy samples, and prepare clear solutions for spectrophotometric analysis. Their fine pore size ensures that even microscopic contaminants are captured, preserving the integrity of downstream analytical methods.
Agricultural testing facilities rely on the 1001‑325 circles to filter soil suspensions, pesticide residues, and plant extracts, providing clean filtrates for chromatography and mass spectrometry. Environmental monitoring labs use them to process air‑borne particulate samples and water quality assessments, where the ability to retain fine particles is critical for accurate pollutant quantification. In educational settings, the circles serve as a practical teaching tool for demonstrating basic filtration principles, allowing students to observe the separation of solids from liquids in real time.
Why Choose Us
Choosing the Whatman 1001‑325 filter paper circles means selecting a product backed by decades of scientific expertise and a commitment to consistency. Whatman’s manufacturing process incorporates state‑of‑the‑art fiber formation techniques that minimize variability, delivering a filter media that behaves predictably across a broad temperature range and diverse chemical environments. This reliability reduces the need for repeat experiments, saving valuable time and resources in both research and quality‑control laboratories.
Our dedication to customer satisfaction extends beyond product performance. Each order is supported by responsive technical assistance, detailed usage guidelines, and a clear return policy should any issues arise. By providing comprehensive documentation and rapid response to inquiries, we empower laboratories to integrate the 1001‑325 circles seamlessly into existing workflows, confident that they will meet or exceed performance expectations.
Key Features
- Uniform 11 µm pore size delivers consistent quantitative filtration results.
- Grade 1 quality ensures low ash content and minimal background interference.
- 25 mm diameter fits standard filtration holders for versatile laboratory use.
- Pack of 100 circles provides ample supply for high‑throughput and routine applications.
- Dedicated customer support and technical assistance for seamless integration.
FAQ
What types of liquids can be filtered with the 1001‑325 circles?
The circles are suitable for a broad spectrum of liquids, including aqueous solutions, organic solvents, food extracts, agricultural suspensions, and environmental samples. Their chemical compatibility and fine pore size make them ideal for both clear filtrations and those requiring retention of fine particulates.
Can these filter paper circles be used with vacuum filtration systems?
Yes, the 25 mm diameter is compatible with most standard vacuum filtration apparatuses. The paper’s structural integrity allows it to withstand the pressure differentials typical of vacuum filtration without tearing, ensuring a smooth and efficient filtration process.
How does the Grade 1 classification affect experimental results?
Grade 1 indicates the highest level of uniformity and low ash content, which translates to minimal background signal and reliable particle retention. This consistency is crucial for quantitative assays where variability in filter performance could lead to inaccurate measurements.
Is there a recommended storage condition for maintaining filter performance?
Store the filter paper circles in a cool, dry environment away from direct sunlight and moisture. Keeping them in their original packaging until use helps preserve their pore structure and prevents contamination, ensuring optimal performance for each filtration.
What support is available if I encounter issues with the product?
Our technical support team is available to assist with any questions regarding product compatibility, usage protocols, or troubleshooting. You can reach out via email or phone, and we provide detailed guidance to help you achieve the best possible results with the 1001‑325 filter paper circles.
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