1934], the original IDLH for hydrogen fluoride (30 ppm) is not being revised at this time. No data are available for acute oral toxicity. Effects may be delayed from 1 to 24 hours. 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. 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. It is also used as rust remover and in glass etching, metal cleaning, and petroleum processing. 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'). (A HAZARD AND RISK ANALYSIS) William .I. Before any HF Use. 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 is a severe poison that may immediately and permanently damage lungs and the corneas of the eyes. Although a weak acid, i.e., it is not strongly disassociated, is used to etch glass. Human exposure to HF can result in severe cutaneous manifestations as well as devastating systemic effects. Hydrogen fluoride (HF) is a byproduct of standard fire suppression systems. There is inconclusive animal data about toxic effects to a fetus. Fluorides are naturally occurring compounds. At high levels, fluorides can result in tooth and bone damage. Low levels of fluorides can help prevent dental cavities. Hydrogen Fluoride is a very toxic chemical with serious long-term health consequences. Like it’s sister, HCl acid, it reacts with water with the release of heat and can cause burns on the skin. Inhalation Hydrogen fluoride (HF) is an extremely toxic substance commonly used in many industries such as textiles, pesticides, and semiconductors. Caution is advised. Hydrogen fluoride is a gas which when in solution with water forms hydrofluoric acid, HF. Fluoride is deposited in the bone (fluorosis), and may cause pain and stiffness in joints and limbs. 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. HYDROGEN FLUORIDE: HOW TOXIC IS TOXIC? 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 … Basis for revised IDLH: Based on acute inhalation toxicity data in humans [Deichmann and Gerarde 1969; Largent 1961] and animals [Machle et al. When combined with water, it is known as hydrofluoric acid. There is no evidence that hydrogen fluoride exposure causes cancer. Hydrogen fluoride gas will be absorbed by rain and into clouds and fog to form hydrofluoric acid, which will fall to the ground. All people who will be in the room while HF is in use must have completed training. Warning: Hydrogen fluoride is highly corrosive. 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 and fluorine are naturally-occurring gases that are very irritating to the skin, eyes, and respiratory tract. 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