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Thumbnail Filmstrip of Quantitative Filter Paper, Grade 42, 2-3um, 150mm, Very Slow, Ashless, Disc, 100/Pk Images
Featuring a high-purity ashless cellulose depth medium, this Grade 42 quantitative filter paper delivers the finest particle retention in the quantitative series, capturing fine and colloidal precipitates within the random matrix of cellulose fibers. Supplied as 150mm discs with a 2-3 micron retention range, a very slow flow characteristic, and a nominal thickness of 160 microns, it is built for critical gravimetric work where minimal particle loss is essential. Each box contains 100 discs.
Key Cellulose Media Characteristics
- Ashless, high-purity cellulose construction suited to gravimetric analysis and processes requiring ashing
- Finest retention level in the quantitative grade series, with a 2-3 micron nominal retention range
- Very slow flow rate that maximizes capture of ultrafine and colloidal particulates
- Depth-filtration structure that entraps particles throughout the thickness of the media
- Nominal thickness of 160 microns for consistent, repeatable separations
Key Construction Characteristics
- Quantitative ashless cellulose filter paper in a 150mm circular disc format
- Hydrophilic medium that wets readily with aqueous samples
- Nonsterile, supplied 100 discs per box
- Compatible with Buchner funnels and filtration under pressure
This filter paper maintains sample integrity by entrapping the smallest particulates while resisting contribution of background ash to weighed residues. Its very slow flow and fine retention provide the precision required for collecting fine inorganic precipitates and for preparing samples ahead of sensitive instrumental analysis. Consistent media thickness supports reliable, reproducible results across repeated determinations.
- Diameter
- 150mm
- Flow Speed
- Very Slow
- Grade
- 42
- Material
- Cellulose
- Membrane Thickness (µm)
- 160
- Mesh Format
- Disc
- Nominal Basis Weight (g/ m²)
- 100
- Nominal Thickness (µm)
- 160
- Pack Count
- 100
- Particle Retention
- 2-3 µm
- Pore Size (µm)
- 2-3
- Qualitative/ Quantitative
- Quantitative
- Sterility
- Nonsterile
- Wettability
- Hydrophilic
- Whatman Equivalent
- Grade 42
- Gravimetric Analysis Captures fine and colloidal precipitates such as barium sulfate and metastannic acid for accurate weight determination.
- Sample Preparation for Instrumental Analysis Removes ultrafine particulates ahead of ICP, ICP-MS, and AAS to protect sensitive instrumentation.
- Ashing Procedures High-purity ashless cellulose minimizes background residue in combustion and ashing workflows.
- Cement and Industrial Analysis Serves as a calcium carbonate filter for quantitative analysis in cement and related industries.
- Fine Precipitate Collection Retains very small crystalline and colloidal precipitates that pass through coarser grades.
- Pressure and Buchner Funnel Filtration Withstands vacuum and pressure filtration of difficult, heavily retentive samples.