Caustic soda (lye) + CO2 tanks daw ang dala ng truck. Nag-crack siguro ang tanks when the truck turned turtle. According to wikipedia "Solvation of sodium hydroxide is highly exothermic, and the resulting heat may cause heat burns or ignite flammables." Any chemists here who can expound on the chemical reactions involved? Lye is commonly used in the manufacture of soap and biodiesel among other things.