[denom]

There was an explosion at a refinery in Superior Wi last week. The blast and resulting fire was within 200 feet of a tank that can hold 76,000 pounds of hydrogen fluoride (only 15,000 lbs were in the tank at the time).

Needless to say, officials are reconsidering the use of Hydrofluoric acid at the facility: http://www.duluthnewstribune.com/business/energy-and-mining/...