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Benzalkonium chloride is reportedly incompatible with soaps and other anionic surfactants, citrates, iodides,nitrates, permanganates, salicylates, silver salts, and tartrates.
B 1457 (OTTO) Benzalkonium chloride, 99% Cas 63449-41-2 - used in the chemical industry as a precipitant and emulsifier/de-emulsifier.