Aldrich

Diatomaceous Earth

AL-143
Mineral Adsorbents, Filter Agents and Drying Agents

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IV. DIATOMACEOUS EARTH

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. 167436 221791 243310 243329 243337 243345
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.