Which material is known for its flammability and is often used in laboratory settings?

Aluminum powder is known for its high flammability and is frequently utilized in laboratory settings, particularly in various chemical reactions and as a component in pyrotechnics. When finely divided, aluminum can ignite easily when exposed to heat or flame, making it essential for safety protocols to be strictly followed when handling this material. Its reactivity can enhance combustion and create potentially hazardous situations if not managed properly.

In contrast, metals like brass and copper are generally non-flammable compared to aluminum. They do not burn or ignite under normal laboratory circumstances and are instead valued for their conductive properties. Silica gel, being a form of silicon dioxide, is significantly less reactive and serves primarily as a desiccant, absorbing moisture rather than presenting a fire hazard. Thus, aluminum powder stands out distinctly in this context due to its flammable characteristics, requiring careful handling and proper safety measures in laboratories.