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
           More
 
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Ingestion of Hydrofluoric acid may cause severe burns to the mouth, oesophagus and stomach. It usually gives rise to severe systemic effects. Ingestion of even small quantities of HF has resulted in death.

Hydrofluoric acid is unique among the acids in its ability to penetrate intact skin. It diffuses through the tissues and disassociates into the hydrogen ion and the fluoride ion. The fluoride ion affects tissue integrity and metabolism by liquefaction necrosis, decalcification and destruction of bone (i.e. it starts to dissolve the calcium from the bones), and binds with calcium and magnesium to form insoluble salts. These insoluble salts will interfere with cellular metabolism, causing cellular necrosis and death. Loss of calcium (hypocalcemia) results from precipitation of calcium from the blood which results in loss of calcium from the bones to try to equilibrate the decreased serum calcium. This may be a delayed fatal event as calcium is important for muscles, including the cardiac muscle. Without calcium many metabolic pathways break down. 

Hydrofluoric acid is a systemic poison. If HF is not rapidly neutralised and the fluoride ion bound, tissue destruction may continue for several days and result in limb loss or death. If burns are left untreated potentially life-threatening metabolic imbalances can develop. This is true both for burns from concentrated solutions and from burns caused by dilute solutions. Do not be HF "weak acid" illusion confused! Acid "strength" refers to the ability to fully ionized in the water, but the lethality of common inorganic acids and its strength is not so much, compare with strong acid, strong oxidizing concentrated sulfuric acid and concentrated nitric acid, no oxidation of sulfuric acid and hydrochloric acid are two different things! Although hydrofluoric acid is "weak acid", human toxicity is strong mineral acid in one of the best! High school learned tip of the iceberg. Do not touch any unfamiliar chemicals!