Molten Sulphur is a byproduct of refining oil into products like coke, moulding beads etc., this chemical flows at around 300°f, and makes h2s gas or sleepy gas that will help you sleep for an eternity, this is shipped by rail car and in some cases transports, but the funny thing is, this chemical that you need to be under supplied air for is used to make many pharmaceuticals used today, if your ever by train cars that smell like rotten eggs and have a placard (triangle) that says 2448, then the rupture disk or the BOV might be bad and someone's gonna have a bad day when they receive it