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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 42, 2-3um Retention, 185mm, Ashless, Very Slow, 100/Pk Images
Featuring a high-purity ashless cellulose depth medium with a 2-3 micron nominal particle retention, this Grade 42 quantitative filter paper delivers the finest retention in the quantitative series for critical gravimetric work. Each 185mm disc measures 160um thick and is supplied 100 per box. The very slow flow rate is the intentional trade-off that maximizes capture of ultrafine particulates, making this medium the reference standard for analytical precipitates that tend toward colloidal dispersion.
Key Glass Fiber Media Characteristics
- Nominal particle retention of 2-3um, the finest retention level in the quantitative grade range for collecting extremely small particles.
- Hydrophilic cellulose structure that separates particulate by entrapment within the depth of the random fiber matrix.
- Very slow filtration speed prioritizes maximum retention over throughput for high-precision gravimetric accuracy.
- Ashless construction suited to processes that require ashing and to trace-level instrumental sample preparation.
- Wet bursting strength of 52kPa for reliable handling during gravity and low-suction filtration.
Key Construction Characteristics
- Material: high-purity ashless cellulose.
- Format: 185mm diameter disc, 160um nominal thickness.
- Quantitative grade intended for gravimetric analysis and sample preparation.
- Pack: 100 discs per box, nonsterile.
This medium maintains analytical precision by minimizing particle loss during filtration, the most common source of error in quantitative workflows. The fine, uniform retention captures colloidal precipitates such as barium sulfate and metastannic acid while supporting accurate downstream weighing and instrumental analysis. Consistent purity and structure help preserve sample integrity across critical analytical procedures.
- Color
- White
- Diameter
- 185mm
- Flow Speed
- Very Slow
- Grade
- 42
- Material
- Cellulose
- Membrane Thickness (µm)
- 160
- Nominal Basis Weight (g/ m²)
- 100
- Nominal Thickness (µm)
- 160
- Pack Count
- 100
- Particle Retention
- 2-3 um
- Pore Size (µm)
- 2-3
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 42
- Critical Gravimetric Analysis Captures the finest precipitates for accurate weight determination where minimal particle loss is essential.
- Colloidal Precipitate Collection Retains fine precipitates with tendencies toward colloidal dispersion, such as barium sulfate and metastannic acid.
- Ashing Procedures Ashless cellulose construction supports processes that require combustion of the filter with the sample.
- Instrumental Sample Preparation Removes fine particulates ahead of sensitive instrumentation to prevent interference and contamination.
- Environmental Sample Analysis Separates solid matter from aqueous extracts for soil and water filtration workflows.
- Cement and Mineral Analysis Used for calcium carbonate and related fine inorganic precipitate determinations.