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
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           Magnesium fluorosilicate
           Barium Fluoride
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In addition to hydrofluoric acid, sulfur hexafluoride (SF6) is also very dangerous:

The substance:

At environmental temperatures sulfur hexafluoride is a colorless, odorless, non-toxic gas of high chemical stability and inertness. It is also non-flammable and about 5 times heavier than air - one of the heaviest known gases. (reference)

Use:

The major use of sulfur hexafluoride is in the electricity supply industry, where it is used as an electrical insulator in transformers and switch-gear, and in magnesium smelting because of its inertness. It also has some minor use in the semiconductor sector, as tracer gas for atmospheric analysis, in tennis balls, high performance vehicle tires and in the cushioning soles of some trainers. 

Major emissions:

Sulfur hexafluoride is a man-made chemical not found naturally in the environment. The major sources of sulfur hexafluoride release include leakage from electrical switchgear, from magnesium smelting processes and use in semiconductor manufacture. 

Impacts on human health and environment:

Excessive exposure to sulfur hexafluoride may affect the brain. The main impact of sulfur hexafluoride on the environment is as a greenhouse gas, influencing climate change. Consequently sulfur hexafluoride is controlled under the Kyoto Protocol. Of the internationally monitored greenhouse gases it has by far the highest global warming potential (23,000 times that of carbon dioxide), however it is only released in small amounts. Due to its stability it has a very long atmospheric lifetime.

Hydrofluoric acid is a colorless, transparent liquid, because of the penetration, corrosion resistance, easy to cause skin necrosis ulcers, if not promptly treated, may be due to severe combined fluorine poisoning. This paper reports our hospital since 1988 rational use of MEBO, take the case of 74 cases of HF burn moist exposure therapy, in which the maximum area of 33%, by using local and systemic treatment were cured. After treatment showed that: the therapy and drugs with analgesic effect is obvious, wound healing, and the role and poisons.

Emergency treatment of hydrofluoric acid:

Rinse the scene: Immediately rinse with water after burn. Rinsing time varies depending on the burn, eyes, skin folds flush time is longer, to prevent the continued role of hydrofluoric acid on the skin.