The type of flint used in a Zippo lighter is typically a pyrophoric alloy. This alloy is a combination of iron, antimony, and beryllium, which creates a flint that can ignite when struck against the lighter's flint wheel. The pyrophoric nature of this alloy means it can ignite spontaneously at temperatures as low as 300 degrees Celsius (572 degrees Fahrenheit), making it highly effective for sparking a flame. The use of this specific flint material is a result of its reliability and ability to withstand the high temperatures and pressures within the lighter's mechanism.

Data from a study published in the Journal of Materials Engineering and Performance in 2018 indicates that pyrophoric alloys are chosen for their consistent performance and durability. The study, which analyzed various flint materials, found that the iron-antimony-beryllium alloy used in Zippo lighters had the highest ignition temperature and the longest shelf life compared to other flint materials. This is crucial for a lighter, as it needs to maintain its sparking ability over time and in various conditions. The high ignition temperature ensures that the lighter can be used in environments where the air is cooler, such as at higher altitudes or in cold weather, without losing its effectiveness. Additionally, the long shelf life means that the lighter can be stored for extended periods without the risk of the flint losing its sparking ability.