1.   Officials of the Atlanta Fire Department said the corrosive material, called hexamethylenediamine, spilled from one car belonging to CSX Corp.

2.   Conventional reactors can be cooled with water, but plutonium requires a more corrosive material such as sodium to draw off heat.

3.   Conventional reactors can be cooled with water, but plutonium requires a more corrosive material to draw off heat.

4.   Four months ago, he was working with hazardous materials so corrosive that, at times, he had to use a respirator to protect his lungs.

5.   Sodium fits the bill, but is also extremely corrosive material.