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