Sodium formaldehydesulfoxylate

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A white, foul-smelling, solid material used as a Bleaching agent for textiles, Soap, and molasses. Sodium formaldehydesulfoxylate is also used in vat color printing pastes.

Synonyms and Related Terms

sodium formaldehydesulfoxylate dihydrate; formaldehyde sodium sulfoxylate; hydroxymethanesulfinic acid sodium salt; sodium sulfoxylate; sodium hydroxymethanesulfinate; Rongalite; Rongalite C

Chemical structure

Sodium formaldehydesulfoxylate.jpg

Other Properties

Soluble in water. Insoluble in absolute ethanol, ether, benzene.

Decomposed by acids.


Composition NaHSO2-HCHO-2H2O
CAS 6035-47-8
Melting Point 63-64
Molecular Weight mol. wt. = 154.11

Hazards and Safety

Releases toxic formaldehyde fumes. May discolorize some blues and greens.

Contact, ingestion, and inhalation causes irritation.

Fisher Scientific: MSDS

Sources Checked for Data in Record

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8764