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Topic: Hydrofluoric acid

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In the News (Thu 18 Jul 19)

  Hydrofluoric acid - Wikipedia, the free encyclopedia
Due to its ability to dissolve silicate compounds, hydrofluoric acid is often used during the rock and mineral analysis process to dissolve rock samples (usually powdered) prior to analysis.
Hydrofluoric acid is also used in the synthesis of many fluorine-containing organic compounds, including teflon and refrigerants such as freon.
Exposure to hydrofluoric acid may not be initially painful, and symptoms may not occur until several hours later, when the acid begins to react with calcium in the bones.
en.wikipedia.org /wiki/Hydrofluoric_acid   (872 words)

 OHS - Standard Operating Procedure for Using Hydrofluoric Acid
Concentrated hydrofluoric acid is used in the fabrication of electronic components, to etch glass and in the manufacture of semiconductors.
Hydrofluoric acid solutions are clear and colorless with a density similar to that of water.
Hydrofluoric Acid may be used when working alone during normal working hours provided knowledgeable laboratory personnel have been alerted and at least one is in the general vicinity.
www.udel.edu /OHS/hfsop.html   (1469 words)

 Hydrogen fluoride (hydrofluoric acid)   (Site not responding. Last check: 2007-09-17)
Hydrofluoric acid is important for analytical analysis at laboratories to dissolve silica from sample rock for which it would be particularly costly to replace and for some nearly impossible for some applications.
Hydrofluoric acid is simply produced by reacting the fluoride mineral (fluorspar or fluorite) with sulfuric acid.
Hydrofluoric acid is readily produced by reacting naturally occurring fluoride minerals with sulfuric acid.
www.chemlink.com.au /hf.htm   (353 words)

 Hydrofluoric Acid | Poison Control Center - Children's Hospital of Philadelphia
Human exposure to hydrofluoric acid may produce serious or life-threatening effects, depending on the route of exposure, the extent of exposure and the concentration of the acid.
Since the metal cleaner contained hydrofluoric acid 5-10 percent, the patient was referred to the burn unit of a local hospital for treatment of hydrofluoric burns.
Hydrofluoric acid is an extremely dangerous chemical that is capable of producing severe tissue damage, systemic complications and even death after exposure.
www.chop.edu /consumer/jsp/division/generic.jsp?id=72622   (4669 words)

 American Family Physician: Hydrofluoric acid burns
Hydrofluoric acid, one of the strongest inorganic acids known, has been in industrial use since its ability to dissolve silica was recognized in the late 17th century.[1] While the acid is still employed in glass etching and frosting, it is also used in the production of semiconductors and fluorocarbons.
Although hydrofluoric acid is a corrosive agent, its hydrogen ion plays a relatively insignificant role in the pathophysiology of burns.
Hydrofluoric acid vapor produces caustic burns with severe swelling of the oropharynx and tracheobronchial tree, occasionally necessitating tracheostomy.
www.findarticles.com /p/articles/mi_m3225/is_n4_v45/ai_12126956   (1218 words)

 Hydrofluoric Acid In The Laboratory
Hydrofluoric acid (HF) is a strong inorganic acid with special chemical properties that make it especially hazardous to laboratory researchers.
Hydrofluoric acid burns differ from other acid burns because the fluoride ion is able to readily penetrate the skin, resulting in deep tissue layer destruction.
Hydrofluoric acid should be stored in chemically compatible, properly labeled containers and separated from alkalis, metals, oxidizers, cyanides, glass, reducing materials, and sulfides.
www.louisville.edu /admin/dehs/LSM/hydrofluoric.htm   (1687 words)

 Hydrofluoric acid   (Site not responding. Last check: 2007-09-17)
Pure hydrogen fluoride is often called anhydrous hydrofluoric acid.
In the human body, hydrofluoric acid reacts with calcium and damages nerves, bone, and several organs including the heart and kidneys.
In the body, hydrofluoric acid reacts with calcium and magnesium ions and can disable organs whose proper function depends on these metal ions.
grupos.xasa.us /wiki/en/wikipedia/h/hy/hydrofluoric_acid.html   (414 words)

 Risk Assessment: Use of Hydrofluoric Acid
However the definition "weak" bears no relation to hydrofluoric acid's ability to damage living tissue with fluoride ions rapidly absorbed through the skin and able to migrate through and destroy tissue until they are eventually sequestered in the bones.
Hydrofluoric Acid of >10% (5M) concentration must be stored in a cool, well- ventilated area in a screw capped polyethylene (or equivalent) container.
Procedures using hydrofluoric acid must never be attempted out of normal working hours and it is strongly advised that procedures are restricted over the lunch period when trained First Aiders may not be available.
www.chm.bris.ac.uk /safety/hf.htm   (765 words)

The purpose of this paper is to raise awareness of the inherent dangers associated with dermal contact with concentrated hydrofluoric acid, and of the importance of observing strict precautions when handling it.
A 37-year-old male laboratory technician was performing acid digestion of oil well core and ditch samples with 70% w/w concentrated hydrofluoric acid in a fume cupboard.
It is evident that apart from location of burns, the size of the burns and concentration of the acid, washing the area affected immediately and the application of calcium gluconate gel to reduce the uptake of fluoride ion may prevent a fatality.
www-safety.deas.harvard.edu /advise/accident.html   (1695 words)

 Hydrofluoric Acid
It is produced from the reaction between calcium fluoride and sulphuric acid to produce HF gas which is cooled and stored as a liquid.
This is unusual among acids which typically cause damage via the free H cations resulting in coagulative necrosis and poor tissue penetration.
Hydrofluoric acid burns are very dangerous and thankfully rare in the United States.
www.mnpoison.org /index.asp?pageID=151   (2805 words)

 Oilfield Glossary: Term 'hydrofluoric acid'
Hydrofluoric acid [HF] is used primarily because it is the only common, inexpensive mineral acid that can dissolve siliceous minerals.
HF is typically mixed with hydrochloric acid [HCl] or organic acid to keep the pH low when it spends, thereby preventing detrimental precipitates.
Hydrofluoric acid should not be used in sandstone formations with high carbonate content because of the high risk of calcium fluoride precipitation [CaF
www.glossary.oilfield.slb.com /Display.cfm?Term=hydrofluoric+acid   (109 words)

 PowerLabs HydroFluoric Acid Demo
Hydrofluoric Acid is quite possibly the most dangerous chemical deal with in PowerLabs.
The high concentration acid also outgases pure HF extensively, and inhalation of as much as a single lungfull of that gas will result in almost certain death by pulmonary edema.
In previous experiments with larger acid batches (which have enough heat capacity not to boil) it was found that a test tube will fully dissolve in under a minute at room temperature.
www.powerlabs.org /chemlabs/hydrofluo.htm   (517 words)

 Hydrofluoric Acid Packaging   (Site not responding. Last check: 2007-09-17)
Hydrofluoric acid (HF) is an extremely hazardous material.
Unlike other strong acids, HF not only causes surface burns, but also rapidly penetrates the skin and causes destruction of underlying tissue and even bone by the extraction of calcium.
Because of the extreme hazards associated with this acid, it is imperative that you protect yourself from accidental contact.
www.mallchem.com /catalog/packaging/HF.asp   (138 words)

 19890523 The Use of Open Containers in Transporting Hydrofluoric Acid and Other Corrosive Chemicals.
The employee was engaged in increasing the percent acid concentration of a 40 gallon acid etch tank that contained a mixture of both nitric and hydrofluoric acids.
All contact of the acid with eyes, skin, respiratory system, or digestive system must be avoided by using personal protective equipment such as face shields, tight-fitting chemical goggles, aprons, boots, coats, jackets, neoprene or polyvinyl chloride gloves, and respirators when appropriate.
Anyone working with anhydrous or aqueous hydrofluoric acid should have received prior instruction about its hazards and in proper protective measures and should know the recommended procedure for treatment in the event of exposure.
www.osha.gov /dts/hib/hib_data/hib19890523.html   (722 words)

 eMedicine - Burns, Chemical : Article by Richard F Edlich, MD, PhD   (Site not responding. Last check: 2007-09-17)
Acid and alkali injuries involving the eye are among the most disastrous of chemical burns.
Acid burns that injure the periphery of the cornea and conjunctiva often heal uneventfully, leaving a clear corneal epithelium.
Hydrofluoric acid (HF) is one of the strongest inorganic acids.
www.emedicine.com /plastic/topic492.htm   (7381 words)

 HYDROFLUORIC ACID   (Site not responding. Last check: 2007-09-17)
HF differs from other strong acids in that it not only causes surface burns but rapidly penetrates the skin, even in dilute solution, and causes destruction of underlying tissue and even bone by the extraction of Calcium.
If the exposure limit is exceeded, a full facepiece respirator with an acid gas cartridge may be worn up to 50 times the exposure limit or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest.
Hydrofluoric acid is incompatible with arsenic trioxide, phosphorus pentoxide, ammonia, calcium oxide, sodium hydroxide, sulfuric acid, vinyl acetate, ethylenediamine, acetic anhydride, alkalis, organic materials, most common metals, rubber, leather, water, strong bases, carbonates, sulfides, cyanides, oxides of silicon, especially glass, concrete, silica, fluorine.
www.rpi.edu /dept/cieem/mcrusers/msds/db/msds/hydrofluoricacid.html   (2324 words)

 Refineries Lack Means to Handle Hydrofluoric Acid, Report Says   (Site not responding. Last check: 2007-09-17)
The study presented Friday was the second update on the progress of the agency's hydrofluoric acid task force, formed in January, 1988, after two accidents involving the corrosive chemical to study whether to regulate or eliminate use of the acid in the Los Angeles area.
Using the 40-to-1 standard, the report said, the best water spray system currently operating at major hydrofluoric acid users in the Los Angeles area is a 9,000-gallon-a-minute system at the Ultramar refinery, which could handle a leak of 225 gallons a minute.
At Mobil, refinery officials are increasing their water system and are planning to install large holding tanks to drain acid rapidly from processing units in the event of a rupture.
www.fluoridealert.org /pollution/1216.html   (904 words)

 University of Wisconsin-Milwaukee Department of Environmental Health, Safety and Risk Management Program -- Health and ...
Hydrofluoric Acid (HF) is one of the strongest and most corrosive acids known.
The HF Acid website is a good source of information on working safely with HF, including proper personal protective equipment while using HF, information of storage, handling and processing, and "Treatment of Exposure".
If your Hydrofluoric Acid acid waste is going to be contaminated with any other hazardous materials (heavy metals, for example), contact staff in UWM's Environmental Affairs Program at x4999 or x2883 before generating the waste.
www.uwm.edu /Dept/EHSRM/LAB/labHF.html   (591 words)

 The Shannon Group at the University of Illinois   (Site not responding. Last check: 2007-09-17)
Hydrofluoric Acid (HF) is one of the strongest and most corrosive of the inorganic acids.
Before using Hydrofluoric Acid, be sure you have a clear idea of what you will do in the event of a skin exposure, eye exposure, etc. involving Hydrofluoric Acid.
If your Hydrofluoric Acid acid waste is going to be contaminated with any other hazardous materials (heavy metals, for example), contact the Chemical Safety Section of the Division of Enviromental Health and Safety before generating the waste.
mrel.bsg.uiuc.edu /shannon/labHF-safety.htm   (813 words)

 PSFC Hydrofluoric Acid
Hydrofluoric acid is generally used in small quantities (i.e., a few ml) to etch glass surfaces.
In extreme cases of inhalation of hydrofluoric acid vapors, lung damage with pulmonary edema leading to subsequent death as well as respiratory arrest may occur.
The hydrofluoric acid user shall be familiar with the hazards associated with hydrofluoric acid and appropriate spill and emergency procedures described in this document.
psfcwww2.psfc.mit.edu /esh/hf.html   (2108 words)

 CHEMINFO: Hydrofluoric acid
The severity of the burns and absorption of the acid (with liquefaction necrosis of soft tissue and decalcification and corrosion of the bone) have resulted in permanent scarring, disability and death.
Hydrofluoric acid is corrosive to aluminum, aluminum bronze, brass, carbon steel, metals containing silica (such as cast iron, high silicon iron, silicon bronze and silicon copper), Inconel, Incolloy, stainless steels, tantalum, titanium and zirconium.
Hydrofluoric acid (HF) is corrosive to the respiratory tract, causing severe irritation and fluid accumulation in the lungs with deaths.
www.intox.org /databank/documents/chemical/hyfluric/cie47.htm   (4792 words)

 PRODUCT MATRIX - HYDROFLUORIC ACID   (Site not responding. Last check: 2007-09-17)
Hydrofluoric acid is a highly toxic, highly corrosive, color less, fuming liquid found in many aluminum cleaners.
Hydrofluoric acid is highly corrosive to the skin and can produce first-degree burns.
Hydrofluoric acid can damage muscles, ligaments, and bone in its progression after skin exposure.
danpatch.ecn.purdue.edu /~epados/waste/house/hydrofl.htm   (103 words)

 Hydrofluoric Acid Safety Video - Refining Industry Only   (Site not responding. Last check: 2007-09-17)
Hydrofluoric Acid is a highly corrosive acid which can severely burn skin and eyes.
"Hydrofluoric Acid Safety" is an 11 minute video which outlines the general guidelines for working safely with hydrofluoric acid in a refinery.
While "Hydrofluoric Acid Safety" is uniquely designed for the training requirements of the petrochemical industry, our 3 minute video entitled "Hydrofluoric Acid 1st Aid," contains hydrofluoric acid first aid information relevant to other industries.
www.filemedia.com /hf   (362 words)

 Hydrogen halides as acids
The problem is that concentrated sulphuric acid is a reasonably strong oxidising agent, and as well as producing hydrogen bromide or hydrogen iodide, some of the halide ions are oxidised to bromine or iodine.
The familiar steamy fumes of hydrogen chloride in moist air are caused by the hydrogen chloride reacting with water vapour in the air to produce a fog of concentrated hydrochloric acid.
A proton is donated from the hydrogen chloride to one of the lone pairs on a water molecule.
www.chemguide.co.uk /inorganic/group7/acidityhx.html   (2131 words)

 CPCS: Hydrofluoric Acid
Hydrofluoric acid is also used in glass etching, dry cleaning (to remove very resistant stains) and in computer component manufacturing.
Strong solutions of the acid cause a quick onset of burning, redness and tissue damage.
Ammonium bifluoride is converted to hydrofluoric acid and can cause the same kind of problems.
www.calpoison.org /public/hydrofluoric.html   (524 words)

 The MSDS HyperGlossary: Acid
Examples of these include acetic acid (a 5% solution of acetic acid in water is called vinegar), formic acid, ammonium cation (NH), and water itself.
Substances with names that end in "oic acid" or "ic acid" are organic acids called carboxylic acids.
For example acids and bases should not be stored or used near each other as their accidental combination could generate a huge amount of heat and energy, possibly resulting in an explosion - here is a terrific example of what can happen when incompatibles are mixed!
www.ilpi.com /msds/ref/acid.html   (655 words)

 Honeywell Hydrofluoric Acid
Anhydrous hydrofluoric acid (AHF) is used to produce environmentally safer fluorocarbon products,...
(Aqueous HF, 49% HF) 49% HF (Aqueous HF) a non-fuming strength of hydrofluoric acid, is used in a variety...
Honeywell is the world's largest producer of Hydrofluoric Acid (HF) and the leader in safe and reliable HF transportation.
www.honeywell.com /sites/sm/chemicals/hfacid   (142 words)

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