Propane tanks are 20 time more puncture resistant that tanks filled with ethanol, methanol or gasoline. They are constructed from carbon steel, under the procedures developed by the American Society of Mechanical Engineers. Propane cylinders are equipped with a device that cuts off the filling process, when the tank reached 80 percent of its liquid capacity. This helps pressure inside the tank, caused by temperature to variate, without a gas emitting from the tank.
Propane has the lowest flammability rating of any alternative fuel.
Propane leaks are easy to detect due to the strong pungent smell that imitates the scent of rotten eggs. Propane will not contaminate water or soil. Unlike other fuels, like gasoline, propane can not be ingested, due to the fact that it is vaporized internally when released form it's container. In contrast with gasoline's ignition temperature of 430 to 500 degrees, propane will not ignite until the air reaches at least 940 degrees Fahrenheit.