Fuller's Earth, Chromatographic
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(Very Fine and Moderately Coarse)—Gray or grayish-white powder or granules consisting mainly of hydrous aluminum-magnesium silicate.
Powder Fineness: see Powder Fineness 〈811〉.
Soluble Matter: Twenty g, treated with 50 mL of cold water and filtered, yields not more than 60 mg of residue upon evaporation of the filtrate (0.3%). A second 20-g portion, treated with 50 mL of cold alcohol and filtered, yields not more than 14 mg upon evaporation of the filtrate (0.07%).
Loss on Drying 〈731〉: Dry it at 105° for 6 hours: it loses between 7.0% and 10.0% of its weight.
[Note - Adjust the water content, if necessary, by drying in vacuum at room temperature, restoring the water required, and equilibrating by shaking for 2 hours.]
