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Whatman 标准级定性滤纸 Grade 4
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品牌 : Whatman
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产品分类：滤纸
Whatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper. They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.
These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).
Extremely high flow rate
Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
Fast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis
Grade 4 Qualitative Filter Papers (20-25 µm particle retention) are available in a variety of sizes and formats including circles, sheets, and rolls. They are also available as prepleated filters, which give improved flow rate and increased loading capacity compared to equivalent flat filters.
How well do you know your filter paper grades and why you use them? To find out, read our blog Back to Basics Part 1: A Guide to Types of Whatman Filter Paper Grades. Ready for more? Read our 6-part blog series Whatman paper filtration 101 or our complete lab filtration blog.
For more information and help choosing from our wide range of filter paper grades, download our Filter paper and membranes guide or find your filter fast with our Whatman filter selector.
PRODUCT SPECIFICATIONS
| Parameter | Grade 4 Qualitative Filter Paper Standard Grade |
|---|---|
| Grade | Grade 4 |
| Grade Type | Standard |
| Diameter | 27 mm |
| Typical Particle Retention in Liquid 1 | 25 µm |
| Nominal thickness | 210 µm |
| Typical water flow rate 2 | 247 ml/min |
| Nominal basis weight | 92 g/m² |
| Nominal air flow rate | 4 s/100 ml/in² |
| Nominal Ash Content 3 | 0.06% |
| Material | Cellulose |
| 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 µg/g Sodium 32.3 µg/g Zinc 58.3 µg/g |
| Application | Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical. |
| Format | Circles / Roll / Sheet |
| Dimensions Ø ( mm ) | 27 / 41 / 42.5 / 47 / 50 / 55 / 70 / 90 / 110 / 125 / 150 / 185 / 240 / 320 / 38*114 / 580*580 |
1：Particle retention rating at 98% efficiency.
2：For 9 cm diameter
3：Ash is determined by ignition of the cellulose filter at 900°C in air.
2：For 9 cm diameter
3：Ash is determined by ignition of the cellulose filter at 900°C in air.
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