The physical properties of biodiesel are similar to those of petroleum diesel (petro diesel), but when burned as fuel, biodiesel significantly reduces greenhouse gas emissions and the release of toxic air pollutants. Biodiesel is also biodegradable. All of these characteristics make biodiesel an attractive alternative to petro diesel. Biodiesel is also adaptable to a variety of uses since it can be blended in many different concentrations. They include B100 (pure biodiesel), B20 (20 percent biodiesel, 80 percent petro diesel), B5 (5 percent biodiesel, 95 percent petro diesel), and B2 (2 percent biodiesel, 98 percent petro diesel). Biodiesel is most commonly used as fuel for vehicles. However, it can also be used as a heating fuel in domestic and commercial boilers. This is sometimes referred to as bio heat. While traditional methods of fire fighting against hydrocarbon (gasoline) fires have been found to be effective against these type fuels, the scope of fire fighting and spill cleanup efforts is extended to include potential incidents at production facilities, storage facilities, transportation facilities and routes, distribution centers, businesses, and even homes. The transesterification process of producing biodiesel involves taking organic oil and altering its chemical structure through the use of an alcohol and a catalyst. The end product is thin and clear enough to be safely used in diesel engines. Biodiesel is a product that is safe to use but dangerous to manufacture. The chemicals that are used in the transesterification process are more hazardous than the final product.