--- product_id: 62825137 title: "1001-325 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 25mm Diameter (Pack of 100)" brand: "whatman" price: "£31.03" currency: GBP in_stock: true category: "Whatman" url: https://www.desertcart.co.uk/products/62825137-1001-325-quantitative-filter-paper-circles-11-micron-10-5 store_origin: GB region: United Kingdom --- # 11µm precise retention Grade 1 trusted quality 10.5 s/100mL/sq inch flow rate 1001-325 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 25mm Diameter (Pack of 100) **Brand:** whatman **Price:** £31.03 **Availability:** ✅ In Stock ## Summary > 🔬 Elevate your lab game with precision you can trust! ## Quick Answers - **What is this?** 1001-325 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 25mm Diameter (Pack of 100) by whatman - **How much does it cost?** £31.03 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/62825137-1001-325-quantitative-filter-paper-circles-11-micron-10-5) ## Best For - whatman enthusiasts ## Why This Product - Trusted whatman brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Convenient:** 25mm diameter circles come in a pack of 100, perfect for high-throughput testing and routine use. - • **Optimized Flow Dynamics:** 10.5 seconds per 100mL per square inch flow rate balances speed and accuracy in filtration. - • **Versatile Industry Standard:** Grade 1 filter paper trusted across food, agriculture, air quality, and educational labs worldwide. - • **Precision Filtration Mastery:** 11 micron retention ensures reliable separation of fine particulates for consistent lab results. - • **Educational & Professional Essential:** Widely adopted for teaching and practical applications, bridging academic and industrial needs. ## Overview Whatman Grade 1 quantitative filter paper circles (25mm diameter) offer 11 micron retention and a 10.5 s/100mL/sq inch flow rate, making them the go-to choice for reliable filtration in food, agriculture, air pollution monitoring, and educational labs. Packaged in convenient sets of 100, these cellulose filters deliver consistent, medium retention performance for a wide range of routine analytical separations. ## Description This Whatman 2.5cm, grade 1, cellulose filter paper is the most widely used filter paper for routine applications with medium retention (11µm) and flow rate. Traditionally, this grade is used in qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate. In agriculture, it is used for soil analysis and seed testing procedures. It is also used for numerous routine techniques in the food industry to separate solid foodstuffs from associated liquid or extracting liquid; and is widely used in education for teaching simple qualitative analytical separations. In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity is measured photometrically. For gas detection, the paper is impregnated with a chromogenic reagent and color formation is quantified by optical reflectance. Retention: 11µm. Diameter: 2.5cm. 100/Pack. Whatman #: 1001-325. ## Features - 2.5cm - Grade 1 - Covers a wide range of laboratory applications; frequently used for clarifying liquids - Areas of use include the food industry, agriculture, air pollution monitoring, and gas detection - Widely used in education for teaching simple qualitative analytical separations ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.1 out of 5 stars 2 Reviews | ## Images ![1001-325 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 25mm Diameter (Pack of 100) - Image 1](https://m.media-amazon.com/images/I/612Nq1-V77L.jpg) ## Frequently Bought Together - Whatman 1001-325 Quantitative Filter Paper Circles, 11 Micron, 10.5 s/100mL/sq inch Flow Rate, Grade 1, 25mm Diameter (Pack of 100) - Weewooday 8 Pieces PTFE Magnetic Mixer Stirrer Bar, White Color Stainless Steel Laboratory PTFE Stir Plate Bar, Mixing Plate Magnet Stick (30 mm/ 1.18 Inch) - SimPure Centrifuge Tubes 15mL, Conical Tubes Sterile 50 PCS, Polypropylene, Leak-Proof Screw Caps, Plastic Container with Graduated and Write Marks, Non-pyrogenic, DNase/RNase Free, Human DNA-Free --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/62825137-1001-325-quantitative-filter-paper-circles-11-micron-10-5](https://www.desertcart.co.uk/products/62825137-1001-325-quantitative-filter-paper-circles-11-micron-10-5) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-20*