<unk><unk>  (HF) is a byproduct of standard fire suppression systems. It is also used as rust remover and in glass etching, metal cleaning, and petroleum processing.
Oral ingestion has very high mortality rate
Onset and severity of symptoms correlated with concentration
Dilute solutions (<20%) may have delayed onset up to 24hr post-exposure
Moderate solutions (20-50%) develop symptoms within 1-8hr
Concentrated solutions (>50%) develop symptoms immediately
These patients are at highest risk for systemic toxicity/death
Pain immediately (even if wound appears minor) implies severe injury
Burn itself may appear relatively minor
Toxicity caused by binding of calcium and magnesium leading to electrolyte derangement and myocardial dysfunction
Dilute solutions (<20%) may have delayed onset up to 24hr post-exposure
Moderate solutions (20-50%) develop symptoms within 1-8hr
Concentrated solutions (>50%) develop symptoms immediately
These patients are at highest risk for systemic toxicity/death
Pain immediately (even if wound appears minor) implies severe injury
These patients are at highest risk for systemic toxicity/death
Pain immediately (even if wound appears minor) implies severe injury
Hydrogen fluoride toxicity
Smoke inhalation injury 
Bath salts toxicity
Chemical injury
Jet Propulsion Fuel 8 toxicity
Acrolein
Lewisite toxicity
Hydrochloric acid