Whatman Grade 1 Qualitative Filter Paper is a trusted, standard-grade cellulose filter paper widely used across analytical, food, environmental, and educational laboratories.
With medium porosity and retention, it efficiently clarifies liquids and separates common precipitates, making it ideal for routine qualitative filtration tasks in food sample preparation, soil testing, and air quality monitoring.
Code: FL1150
€62.36
7-10 Working Days
Code: FL1150
Availability 7-10 Working Days
€62.36
Key Features & Benefits
- Reliable Medium Retention: At ~11 μm, this filter captures precipitates like lead sulfate, calcium carbonate, and calcium oxalate, while allowing soluble analytes to pass for downstream analysis.
- Balanced Flow Rate: Offers efficient flow (~57 mL/min) without compromising sample integrity or speed, ideal for routine lab use.
- High Purity & Low Ash: Contains minimal ash (~0.06 %), reducing interference in sensitive allergen or chemical assays.
- Versatile Formats: Available in multiple shapes and sizes to fit funnels, flasks, and vacuum systems, including convenient disposable Filter Cups with integrated filters.
- Proven Performance: Routine use in food, environmental, agricultural, and air pollution monitoring labs demonstrates its robustness and consistency.
Applications
- Food Testing: Clarify homogenised extracts and separate solids from allergenic proteins or neoteric compounds.
- Environmental Testing: Capture particulates in soil, water, and air sampling.
- Analytical Chemistry: Standard sample clarification prior to spectroscopy, chromatography, or colourimetric assays.
- General Laboratory Use: Everyday filtration, teaching labs, and process checks.
Application for the Allergen Testing Pro Kits
Used to filter the Sample Extract after vortexing and heating, particularly to remove particulates before test application.
| Material | Cellulose | Particle Retention | ≈ 11 μm typical |
|---|---|---|---|
| Porosity | Medium—suitable for general-purpose filtration | Filtration Speed | ASTMT: ~40 s (Herzberg: ~150 s) for 100 mL water per square inch |
| Basis Weight | 87 g/m² | Airflow Rate | ~13 s per 100 mL/in² |
| Formats Available | Circles (10 mm–400 mm), sheets, pre‑pleated funnels, and FilterCup format | Trace Element Content | Low levels of metals (Al, Ca, Fe, Na, K, Zn, etc.) — ideal for sensitive assays |
| Application | Used filter paper for routine applications with medium retention and flow rate. Covers a wide range of laboratory applications and is frequently used for clarifying liquids. | Diameter | 150 mm |
| Grade | Grade 1 | Grade Type | Standard |
| Nominal Ash Content | 0.06% | Nominal air flow rate | 13 s/100 ml/in² |
| Nominal basis weight | 87 g/m² | Nominal thickness | 180 µm |
| Typical Particle Retention in Liquid | 11 µm | Typical Trace Element Levels | Aluminium 3.6 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead <0.5 µg/g Magnesium 21 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 6.2 µg/g Silicon 8.8 µ |
| Typical water flow rate at 45 psi (3.1 bar) | 57 ml/min |