Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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When you are talking to others, be aware that the abbreviation Hydrofluoric acid could stand for three different things – ‘high frequency’, ‘hydrogen fluoride’ and ‘hydrofluoric acid’. You may meet the former meaning in connection with welding or other electrical equipment. However most of the time in the University context the letters HF mean ‘hydrofluoric acid’. Hydrogen fluoride is a gas. Hydrofluoric acid is a solution of hydrogen fluoride in water. You may also come across ‘buffered HF’.  A buffered solution is designed to maintain a reasonably constant pH against the addition of modest quantities of either hydrogen or hydroxide ions. The way that this is normally done is to use a solution of a weak acid in conjunction with one of its soluble salts. Thus buffered HF contains HF and a soluble fluoride. There are therefore more fluoride ions in the solution than there are hydrogen ions and you may decide, after reading the sections on properties and effects of exposure, that a buffered solution may be more dangerous than an ordinary HF solution of the same pH. HF can also be purchased in pyridine.

Hydrogen fluoride is a colourless fuming gas which liquefies at 19℃ and readily dissolves in water. It is very toxic by inhalation, in contact with the skin, or if the liquefied gas is swallowed. The liquefied gas causes severe painful burns on any tissue it touches. The vapour severely irritates the eyes and respiratory system, and can also burn the skin. Hydrofluoric acid corrosion is penetrating, but there will be no feeling of a beginning, therefore this is the most dangerous. Fluoride will continue to dissolve the cell membrane, and calcium ion reaction bones, and then the loss of calcium can lead to abnormal cell fluid. After about 24 hours you will feel the piercing pain, because about this time affects the nerve cells, and this is very serious pain, is unable to morphine analgesic. In the end, epidermis, dermis, subcutaneous tissue are all necrosis!

Whether in dilute or in concentrated forms, Hydrofluoric acid performed a colourless liquid. In concentrations above approximately 40 to 50% the acid gives off significant quantities of corrosive fumes which have a pungent odour similar to chlorine. Unless heated, solutions at less than 40% concentration do not give off significant vapour concentrations. The liquid is corrosive and can dissolve glass, corrode most metals, and destroy clothing and human tissue. Containers of HF carry the  hazard warning symbols is black pictogram on an orange background.