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- Whatman Filter Paper No.1 2.5cm Pack of 100
Whatman Filter Paper No.1 2.5cm Pack of 100
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Print PageWhatman Filter Paper No.1 2.5cm Pack of 100. Part number 1001-325
Whatman No. 1 Filter paper circles and sheets from Cytiva
Grade 1: 11µm particle retention - The most widely used filter paper for routine applications with medium retention and flow rate. Extended range of sizes includes 10mm to 500mm diameter circles and 460mmx570mm sheets.
This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids. Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot) and calcium carbonate.
In agriculture, it is used for soil analysis and seed testing procedures. In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.
In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically. For gas detection, the paper is impregnated with a chromogenic reagent and colour formation quantified by optical reflectance.
| Parameter | Grade 1 Qualitative Filter Paper Standard Grade |
|---|---|
| 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 | see description |
| Grade | Grade 1 |
| Grade Type | Standard |
| Material | Cellulose |
| Nominal Ash Content 1 | 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 2 | 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 µg/g Sodium 32.3 µg/g Zinc 58.3 µg/g |
| Typical water flow rate 3 | 57 ml/min |
| Format | Circles |
1Ash is determined by ignition of the cellulose filter at 900°C in air.
2Particle retention rating at 98% efficiency.
3 Based on a 9 cm diameter paper
To help you choose the right filter for your application please click on the image below that will take you to the application guide for:
         
- Qualitative Filter papers
- Quantitative filter papers
- Microfiber and Quartz filter papers
 There is also a link to the Cytiva Filter Paper Selector Guide
