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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Hydrofluoric acid on the skin has strong corrosion resistance, permeability is strong, and the tissue protein has the dehydration and dissolution. Severe pain and progressive tissue necrosis is the characteristic of hydrofluoric acid burn. Exposure to low concentration (< 40%) of hydrofluoric acid, light irritation, can have numbness and formication. Skin contact local initial performance for local erythema, immediately turned around to flush white edema or blister, nail parts are colored, floating. Pain often after contact with 2 ~ 4 h incubation period of the beginning, then gradually intensified, alleviates the 2 ~ 3 days later. Pain of time is often associated with exposure concentration, high concentration (anhydrous hydrofluoric acid), or more than 40% concentration of hydrofluoric acid pain happen immediately, local skin flush on early, quickly turned gray marble, then organize liquefaction necrosis in fruit pulp, Ⅲ degree burn eschar in black leather samples, if not handled in time can be as deep as bone, bone aseptic necrosis. Concentration less than 20% of hydrofluoric acid to late-onset pain over a period of time. Hydrofluoric acid burn of eye conjunctival edema, hemorrhage, corneal opacity can rapidly form a white membrane, matrix edema, recurrent epithelial erosion, fall off, processing is not timely can cause perforation. The scope and depth of the eye tissue damage along with the amount of hydrofluoric acid into the eye and the concentration and different.  

When the surface contact area of hydrofluoric acid concentration > 50% > 5% or contact, burn area of 1% or higher, or with inhalation injury of acid mist to alert may cause systemic poisoning.