The most flammable substance in the world is chlorine trifluoride, according to About.com. This substance is so flammable that it does not require an ignition source to combust. More »

The element hydrogen is extremely flammable and is often described as the most flammable of all known substances. Hydrogen can be ignited by heat, sunlight or a small spark. When pure hydrogen burns, ultraviolet light ra... More »

Glycerin is a flammable substance. Unlike many other substances, its flammability rating stands at a 1, which makes it very likely to not become ignited. More »

Wax is a highly flammable substance. Wax is the fuel that keeps candles burning so that they produce light. The wick soaks up the wax and draws more into the flame so that it stays lit. More »

Titanium is flammable, but only when heated in air at temperatures of 610 degrees Celsius or higher. At that temperature, Titanium undergoes a chemical reaction with the hot air, and eventually forms titanium dioxide. Ti... More »

Although helium is volatile due to its light weight and physical properties, it is chemically inactive and is, therefore, not flammable. For an object to be flammable, it must be able to react with an oxidant, such as ox... More »

Plastic is potentially flammable. Flammability is a trait tested in commercial plastic products by Underwriters Laboratories, the industry standard in plastic flammability ratings. Underwriters Laboratories testing assig... More »