No data are available for acute oral toxicity. Although a weak acid, i.e., it is not strongly disassociated, is used to etch glass. Hydrogen fluoride (HF) is a byproduct of standard fire suppression systems. Hydrogen fluoride gas will be absorbed by rain and into clouds and fog to form hydrofluoric acid, which will fall to the ground. 1934], the original IDLH for hydrogen fluoride (30 ppm) is not being revised at this time. There is inconclusive animal data about toxic effects to a fetus. Hydrogen fluoride is a severe poison that may immediately and permanently damage lungs and the corneas of the eyes. When combined with water, it is known as hydrofluoric acid. Low levels of fluorides can help prevent dental cavities. Caution is advised. Hydrogen Fluoride is a very toxic chemical with serious long-term health consequences. (A HAZARD AND RISK ANALYSIS) William .I. All people who will be in the room while HF is in use must have completed training. Hydrogen fluoride and fluorine are naturally-occurring gases that are very irritating to the skin, eyes, and respiratory tract. At high levels, fluorides can result in tooth and bone damage. Inhalation Hydrogen fluoride (HF) is an extremely toxic substance commonly used in many industries such as textiles, pesticides, and semiconductors. It is also used as rust remover and in glass etching, metal cleaning, and petroleum processing. Like it’s sister, HCl acid, it reacts with water with the release of heat and can cause burns on the skin. A REVIEW OF THE INHALATION TOXICITY OF HYDROGEN FLUORIDE David P. Kelly Haskell Laboratory, DuPont Company Newark, DE 19714 USA The purpose of this talk is to review the toxicity of hydrogen fluoride especially as it pertains to health risks from accidental exposures. Hydrogen fluoride will rapidly and extensively dissociate in the environmnet to form its constituent ions: hydrogen (hydronium) and fluoride. Effects may be delayed from 1 to 24 hours. Before any HF Use. The toxicity of the hydrogen (hydronium) ion will be apparent only at very high concentrations due to pH effects and is not considered to be relevant for the environmental risk assessment. Warning: Hydrogen fluoride is highly corrosive. HYDROGEN FLUORIDE: HOW TOXIC IS TOXIC? Signs and Symptoms of Acute Hydrogen Fluoride Exposure: Acute exposure to hydrogen fluoride will result in irritation, burns, ulcerous lesions, and necrosis of the eyes, skin, and mucous membranes. Basis for revised IDLH: Based on acute inhalation toxicity data in humans [Deichmann and Gerarde 1969; Largent 1961] and animals [Machle et al. Its worst-case disaster scenario includes 143,262 pounds of hydrogen fluoride released over 10 minutes, which could travel as a toxic cloud for more than 7 … Brock Haskell Lahoratory, DuPont Company Newark, DE 19714 USA The purpose ofthis presentation is to review the toxicity of hydrogen fluoride (HF) especially ;IS it relates to health risks from accidental exposures, and review certain exposure limits that have been established for accidental releases. Human exposure to HF can result in severe cutaneous manifestations as well as devastating systemic effects. Hydrogen fluoride is a gas which when in solution with water forms hydrofluoric acid, HF. Oral ingestion has very high mortality rate; Onset and severity of symptoms correlated with concentration Dilute solutions (<20%) may have delayed onset up to 24hr post-exposure Hydrogen fluoride is listed on Annex I of Directive 67/548/EEC with R26/27/28 classification ('Very toxic by inhalation, in contact with skin and if swallowed'). 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