These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.
Grade 1: 11 um (medium flow filter paper)
The most widely used filter paper for routine applications with medium retention and flow rate. Extended range of sizes includes 10 to 500 mm diameter circles and 460 x 570 mm 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 color formation quantified by optical reflectance.’
Properties
- – Particle retention: 11µm
- – Nominal thickness: 180 µm
- – Nominal basis weight: 87 g/m2
- – Nominal ash content: 0.06%
Applications
- – Qualitative analytical separation for lead sulfate, calcium oxalate, and calcium carbonate
- – Soil analysis and seed testing
- – Separating foodstuffs from associated liquid or extracting liquid
- – Collecting atmospheric dust for photometric measurement
- – Gas detection through the addition of a chromogenic reagent
Available Sizing
| CODE | Sizing | Description | Pack size |
|---|---|---|---|
| 1001-6508 | 10 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 10 mm | 500 ea |
| 1001-0155 | 15 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 15 mm | 500 ea |
| 1001-020 | 20 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 20 mm | 400 ea |
| 1001-325 | 25 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 25 mm | 100 ea |
| 1001-025 | 25 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 25 mm | 400 ea |
| 1001-329 | 30 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 30 mm | 100 ea |
| 1001-030 | 30 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 30 mm | 400 ea |
| 1001-032 | 32 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 32 mm | 100 ea |
| 1001-042 | 42.5 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 42.5 mm | 100 ea |
| 1001-045 | 45 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 45 mm | 100 ea |
| 1001-047 | 47 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 47 mm | 100 ea |
| 1001-055 | 55 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 55 mm | 100 ea |
| 1001-070 | 70 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 70 mm | 100 ea |
| 1001-085 | 85 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 85 mm | 100 ea |
| 1001-090 | 90 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 90 mm | 100 ea |
| 1001-110 | 110 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 110 mm | 100 ea |
| 1001-125 | 125 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 125 mm | 100 ea |
| 1001-150 | 150 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 150 mm | 100 ea |
| 1001-185 | 185 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 185 mm | 100 ea |
| 1001-240 | 240 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 240 mm | 100 ea |
| 1001-270 | 270 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 270 mm | 100 ea |
| 1001-320 | 320 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 320 mm | 100 ea |
| 1001-385 | 385 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 385 mm | 100 ea |
| 1001-400 | 400 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 400 mm | 100 ea |
| 1001-500 | 500 mm dia | Whatman® qualitative filter paper, Grade 1, circles, diam. 500 mm | 100 ea |
| 1001-813 | 26 mm × 31 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 26 mm × 31 mm | 100 ea |
| 1001-824 | 75 mm × 100 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 75 mm × 100 mm | 500 ea |
| 1001-917 | 460 mm × 570 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 460 mm × 570 mm | 100 ea |
| 1001-918 | 460 mm × 570 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 460 mm × 570 mm | 500 ea |
| 1001-929 | 600 mm × 600 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 600 mm × 600 mm | 100 ea |
| 1001-931 | 580 mm × 680 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 580 mm × 680 mm | 100 ea |
| 1001-932 | 580 mm × 680 mm | Whatman® qualitative filter paper, Grade 1, sheets, W × L 580 mm × 680 mm | 500 ea |
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