Precision in gravimetric analysis requires high-purity filter media that leave minimal ash residue after mineralization. LabFriend provides an extensive selection of quantitative filter paper, located within the filtration section of our distillation, separation, and filtration department. These professional-grade ashless filters are engineered for critical analytical procedures where the mass of the precipitate must be accurately determined.
Why Choose Professional Quantitative Filter Paper?
Our curated collection of ashless filter media is designed for chemical purity, high alpha-cellulose content, and specific flow characteristics:
- Fast Filtration Circles: We stock LLG Filter Circles (Quantitative Fast) in diameters ranging from 90 mm to 125 mm, ideal for the rapid removal of coarse precipitates.
- Very Fast Throughput: Utilize LLG Filter Circles (Quantitative Very Fast), available in sizes from 90 mm up to 185 mm, designed for high-volume processing of large-grained particles.
- Ashless Purity: These filters are acid-washed to ensure an extremely low ash content (typically <0.01%), ensuring they do not interfere with sensitive weighing results after ignition.
- Wide Range of Diameters: Find the exact fit for your Buchner funnel or filter holder with circles available in 90mm, 110mm, 125mm, 150mm, and 185mm sizes.
LabFriend supplies quantitative filter paper from industry-leading manufacturers trusted for analytical consistency:
- LLG Labware: Offers a comprehensive range of cost-effective, high-quality quantitative circles in multiple speeds for daily analytical tasks.
- Hahnemühle: Renowned for premium cellulose products, providing high-purity ashless filters for demanding research and industrial applications.
- Macherey-Nagel: German specialists offering precision-engineered filtration media for exact gravimetric determination.
- Sartorius: A global leader in laboratory technology, providing high-performance filtration solutions for critical quantitative analysis.
Accurate filtration is the cornerstone of quantitative chemistry; to complete your analytical or distillation assembly, we recommend exploring these related categories:
- Qualitative Filter Paper: For routine clarifying and identification tasks where ash content is not critical, explore Macherey-Nagel and Hahnemühle circles.
- In-Line Filters: Protect your vacuum systems during suction filtration using Sartorius air filtration units.
- Microfilter Plates: For high-throughput sample processing, utilize AHN Biotechnologie 96-well filter plates.
- Distillation Accessories: Maintain stable conditions in your workflow using J.P. Pöllath boiling stones for subsequent concentration steps.
Unsure if a "Fast" or "Very Fast" grade is most suitable for your specific precipitate grain size? Our team provides local technical support to help you find the perfect analytical solution with fast shipping and competitive pricing.
Frequently Asked Questions
1. What makes filter paper "quantitative"?
Quantitative filter paper is acid-washed to remove impurities and minerals, resulting in an "ashless" paper. This allows the paper to be burned away during gravimetric analysis without adding measurable mass to the remaining precipitate.
2. When should I use "Very Fast" filter circles?
Grade "Very Fast" circles, like those from LLG, are intended for the filtration of coarse, crystalline precipitates that require a high flow rate to process efficiently.
3. What is the difference between qualitative and quantitative paper?
Qualitative paper is used for general separation and identification. Quantitative paper is specifically for applications where the filtered material will be weighed (gravimetry), as it leaves virtually no residue when ashed.
4. How do I match the circle size to my funnel?
The filter circle diameter should be slightly smaller than the diameter of the funnel's top rim but large enough to cover the perforated area of a Buchner funnel or the sides of a conical funnel to prevent bypass.
