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Aldrich
Diatomaceous Earth | ||
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AL-143 Mineral Adsorbents, Filter Agents and Drying Agents |
| Home / Molecular Sieves / Activated Alumina / Activated Carbon / Diatomaceous Earth Ascarite II® Adsorbents / Montmorillonites and other Mineral Adsorbents / Drying Agents Toxicity and Handling / References |
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IV. DIATOMACEOUS EARTH |
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Known by a variety of tradenames, diatomaceous-earth products find common use as filter agents and all-purpose adsorbents, as well as in specialized applications, such as catalyst carriers. These products, also known as diatomaceous silicas, are powders generally having a silicon dioxide assay of about 90%. The CAFA (Celite® Analytical Filter Aid) product is double-acid-washed to remove trace metal oxides and contains about 97.5% SiO2. It is useful as an analytical filter agent and for high-purity applications. Celite 521 is acid-washed and contains about 94% SiO2. It is suitable for use where exceptional purity is desired. The Celatom® products are flux-calcined, with a pH (10% slurry) of 8.0-9.5, and specific gravity of 2.33. |
| Table 7 | ||||||
| Catalog No. | 16,743-6 | 22,179-1 | 24,331-0 | 24,332-9 | 24,333-7 | 24,334-5 |
| Grade | CAFA | Celite | Celatom FW-14 |
Celatom FW-50 |
Celatom FW-60 |
Celatom FW-80 |
| Flow rate | 100 | 200 | 700 | 2500 | 3000 | 5500 |
| Median size (µ) | 2.5 | 3.5 | — | — | — | — |
| Clarity | 1000 | 500 | 969 | 940 | 936 | 927 |
| Acid-soluble iron (ppm) | 60 | 15 | — | — | — | — |
| Wet density (lb/cu ft) |
17 | 19-90 | 19 | 18 | 18 | 17 |
| Avg. particle size (µ) | 7.5 | 14 | 8 | 15 | 19 | 23 |
| Moisture (%) | 1 | 0.5 | — | — | — | — |
| Color | white-grey/ pink | light-pink to tan |
white | white | white | white |
| Celite is a registered trademark of JohnsManville Corp. Celatom is a registered trademark of EaglePicher Industries, Inc. |
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