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Thumbnail Filmstrip of Quantitative Filter Paper, 70mm, Grade 42, 2-3um Retention, Very Slow, Ashless, 100/Pk Images
Featuring a high-purity ashless cellulose medium, this 70mm quantitative filter paper disc delivers the finest particle retention in the quantitative series, capturing fine precipitates within the depth of its random cellulose fiber matrix. With a very slow flow rate and a 2-3um nominal retention range, it maintains a 160um thickness and a 100 g/m² basis weight, providing the dense, uniform structure needed for accurate gravimetric work.
Key Cellulose Filter Paper Characteristics
- Ashless purity: Manufactured from acid-washed, high-purity cellulose for extremely low ash content, supporting accurate weight measurements in ignition-based methods.
- Finest retention: A 2-3um nominal retention range provides the highest particle capture in the quantitative grade range, ideal for very fine precipitates.
- Very slow flow: Dense fiber structure trades flow speed for maximum retention of ultrafine particulates.
- Naturally hydrophilic: The cellulose medium wets readily with aqueous samples for consistent filtration.
- Depth filtration: Particles are entrapped throughout the random cellulose matrix rather than only at the surface.
Key Construction Characteristics
- Format: 70mm diameter circle (disc) for use with standard funnels and Buchner setups.
- Thickness: 160um with a nominal basis weight of 100 g/m².
- Wet bursting strength: 52 kPa.
- Packaging: Supplied nonsterile, 100 discs per box.
This quantitative paper delivers reliable, reproducible separations for critical analytical workflows. Its low ash content and uniform fiber density help preserve sample integrity and minimize blank correction, supporting confident gravimetric and instrumental sample preparation.
- Diameter
- 70mm
- Dimensions
- 70mm
- Flow Speed
- Very Slow
- Folded/ Fluted/ Pleated
- No
- Grade
- 42
- Hardened (Yes/ No)
- No
- Material
- Cellulose
- Membrane Thickness (µm)
- 160
- Nominal Basis Weight (g/ m²)
- 100
- Nominal Thickness (µm)
- 160
- Pack Count
- 100
- Particle Retention
- 2-3um
- Pore Size (µm)
- 2-3
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wet Strengthened (Yes/ No)
- No
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 42
- Gravimetric Analysis Captures very fine analytical precipitates such as barium sulfate and metastannic acid for accurate quantitative determinations.
- Ashing Procedures Low ash content makes the paper suitable for ignition-based methods where filter residue affects mass measurements.
- Instrumental Sample Preparation Removes fine particulates ahead of ICP, ICP-MS, and AAS analysis to protect sensitive instrumentation.
- Environmental Sample Prep Separates solid matter from aqueous extracts in soil and water analysis where contamination control is critical.
- Fine Precipitate Recovery Retains colloidal and ultrafine precipitates with very slow flow for complete capture.
- Trace-Level Filtration Supports analyses sensitive to very low background contamination thanks to high cellulose purity.