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Description
Filter Paper Qualitative No.131Filter Paper Qualitative No. 131: High retention efficiency for fine crystalline precipitates such as barium sulphate; characterised by a slow flow rate, a smooth surface, and normal hardness. Qualitative Filter Papers: Premium qualitative filter paper crafted from 100% cotton linter cellulose. Exhibits exceptional pH tolerance (0 12) and thermal stability (up to 120C) with minimal ash content (0. 1%). Ideal for precise precipitate removal and
Filter Paper Qualitative No.131:
High retention efficiency for fine crystalline precipitates such as barium sulphate; characterised by a slow flow rate, a smooth surface, and normal hardness.
Qualitative Filter Papers:
Premium qualitative filter paper crafted from 100% cotton linter cellulose. Exhibits exceptional pH tolerance (0-12) and thermal stability (up to 120°C) with minimal ash content (0.1%). Ideal for precise precipitate removal and clarification procedures in laboratory settings. Specifically designed for preparation stages in qualitative analytical workflows.
| Weight (g/m) | 140 |
| Thickness (mm) | 0.25 |
| Flow Time (sec) | 240 |
| Absorption speed (cm) | 6.0 |
| Wet Strength (kPa) | 8 |
| Nominal Rating (um) | 3 (medium-fine) |
| Collection Efficiency (%, 0.3um DOP) | 90 |
Note:
- Filter paper Qualitative No.131 is characterized by three key performance metrics: flow time (seconds needed for 100 mL distilled water at 20°C to filter through a 10 cm² section under 10cm water column pressure), absorption speed (distance water travels up a vertical strip in 10 minutes at 20°C), and wet strength (pressure resistance measured via Mullen Burst Strength Tester after water immersion).
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Type
Pore Size Range
Typical Use
Effect on Liquid Clarity
Flow Speed
Qualitative (e.g., Grade 1)
8–11 μm
Routine lab filtration, removing larger sediments
Good for basic clarity (traps visible particles like sand or grounds)
Fast
Quantitative (e.g., Grade 5 or finer ash-free)
2.5–3.5 μm
Analytical work, gravimetric analysis
Best for high clarity (traps very fine particles, ideal for purifying solutions or beverages like wine)
Medium to slow
Glass Microfiber
0.7–2.7 μm
High-temperature or chemical-resistant filtration
Excellent for ultra-clear results in specialised cases (e.g., air pollution analysis), but less common for liquids
Fast (but requires flat use, not folding)
Specialty (e.g., Wine Filtration)
7–10 μm
Food/beverage clarification
High clarity for consumables, retaining fine sediments while preserving taste
Medium
Shipping Notes
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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