Ferric chloride

Agent Name
Ferric chloride
Alternative Name
Ferric trichloride
CAS Number
Major Category
Ferric chloride formula graphical representation
Ferric trichloride; Chlorure ferrique [French]; Chlorure perrique [French]; Flores martis; Iron chloride; Iron perchloride; Iron sesquichloride (DOT); Iron trichloride; Iron(III) chloride; Iron(III) chloride, solution; Natural molysite; Perchlorure de fer [French]; Ferric chloride solution; Ferric chloride solutions; Ferric chloride, anhydrous; [ChemIDplus] UN1773; UN2582 (solution)
Metals, Inorganic Compounds
Dark solid (red by transmitted light, green by reflected light) that sometimes appears brownish-black; Highly hygroscopic and readily forms the hexahydrate; Soluble in water; [Merck Index] Greenish-black odorless solid; [CHRIS]
Used as a medication, an analytical reagent, an etching agent (engraving, photography, and printed circuits), a catalyst, a mordant, a disinfectant, a pigment, and a feed additive; also used in sewage treatment and water purification; [HSDB] Found in nature as the mineral molysite; Used in photography, to make other iron salts, pigments, and inks, and for chlorinating silver and copper ores; [Merck Index]
Toxic by ingestion: 10 tablets (0.3 g Fe/tablet) causes mild illness in children; 20 tablets cause severe intoxication; Mortality rate was 1% in 474 acute iron poisoning cases; [ACGIH] Corrosive to skin; [Quick CPC] An irritant that may cause liver injury; [Merck Index] Decomposed by water forming hydrogen chloride; A skin, eye, and respiratory tract irritant; Corrosive on ingestion; [ICSC] A skin, eye, nose, and throat irritant; Prolonged skin contact can case burns; [CHRIS] A skin and strong eye irritant; Toxic by ingestion; [Aldrich MSDS] See "Iron salts, soluble." See "Ferric chloride hexahydrate."
Biomedical References

Exposure Assessment

Skin Designation (ACGIH)
Insufficient data
1 mg/m3, as Fe (soluble iron salts)
Explanatory Notes
TLV is for "Iron salts, soluble"; [ACGIH] Melting point = approximately 300 degrees C; [HSDB] Vapor pressure = 1 mm Hg at 194 degrees C; [HSDB] The Guide in the Emergency Response Guidebook is for "Ferric chloride, annhydrous."

Adverse Effects

Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion
Skin burns

Diseases, Processes, and Activities Linked to This Agent


Activities with risk of exposure: