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Thumbnail Filmstrip of Grade 114 Qualitative Filter Paper Wet-Strengthened, 125mm Circle, 100/Pk Images
Whatman grade 114 quaitative filter papers are o
Qualitative Filter Paper - 1114-125
Pre-filtering turbid samples before instrumental analysis needs a paper grade that removes interfering particles while maintaining reasonable flow rates. Medium retention grades capture suspended solids while maintaining flow rates suitable for routine laboratory sample throughput requirements. From fiber selection through final inspection, the manufacturing process ensures every sheet meets the performance specifications of its grade.
Key Filter Paper Characteristics
- Manufactured from high-purity cotton linters, qualitative filter paper provides a clean filtration surface with minimal fiber shedding.
- Resin-bonded fiber structure resists progressive weakening that causes standard papers to fail during extended vacuum filtration cycles.
- Available in precut circles and sheet stock to match funnel sizes and custom cutting requirements across laboratory applications.
- Rated at 25um particle retention, the fiber matrix provides a defined cutoff for consistent separation across analytical batches.
- Nominal basis weight of 190g/m² reflects the fiber density that determines flow rate, retention, and mechanical handling characteristics.
When your application makes the filter paper part of the measurement, the ash and weight specifications above define its analytical contribution. Sheet-to-sheet consistency means your training investment carries forward as new staff learn the same predictable filtration behavior. Secure your research outcomes by partnering with a filtration solution that understands your need for speed, accuracy, and reproducibility.
nly half the thickness of Grade 113 and suitable for coarse or gelatinous precipitates. Smooth surface for easy recovery of precipitates.These extremely strong filter papers have a high wet strength due to the addition of a small quantity of chemically stable resin. Normal qualitative applications will not introduce any significant impurities into the filtrate. The resins do, however, contain nitrogen so these grades should not be used in Kjeldahl estimations, etc.
| Whatman Product Code | 1114-125 |
| Type | Wet-Strengthened |
| Filter Media | Cellulose |
| Grade | 114 |
| Size | 125 mm Diameter |
| Typical Particle Retention in Liquid | 25 µm |
| Thickness | 190 µm |
| Basis Weight | 75 g/m^2 |
| Air Flow Rate | 4 s/100 mL/in^2 |
| Water Flow Rate | 333 ml/min |
| Format | Circles |
| Pack Size | 100 |
- Diameter
- 125mm
- Flow Speed
- Fast
- Folded/ Fluted/ Pleated
- No
- Grade
- 114
- Hardened (Yes/ No)
- No
- Material
- Cellulose Fiber
- Nominal Basis Weight (g/ m²)
- 190g/m²
- Particle Retention
- 25um
- Pore Size (µm)
- 25
- Qualitative/ Quantitative
- Qualitative
- Sterility
- Nonsterile
- Wet Strengthened (Yes/ No)
- Yes
- Wettability
- Hydrophilic
- Beverage Testing - Filters wine, beer, and juice samples before clarity and color measurements in food quality control laboratories.
- Paint and Coatings QC - Removes gels and undispersed pigment from coating samples prior to color measurement and viscosity testing.
- Precipitation Recovery - Collects insoluble reaction products on the paper surface for subsequent washing and downstream analysis.
- Enzyme Clarification - Removes particulates from enzyme solutions before activity assays in biochemistry and industrial testing.
- Soil Extract Filtration - Clarifies soil slurries for nutrient and pH testing, removing fine particles that interfere with analysis.
- Botanical Extraction - Separates plant tissue debris from aqueous and solvent extracts during natural product preparation workflows.