Sulfur, when you spark it, it goes up in to flames, can be a solid or a powder and if your up for it potassium nitrate, flammable, mix with sulfur to make gun powder
You should now make sodium(Na) when mixed with water causes a reaction that cause fire, in powder form. Aluminum powder, flammable, when mixed with broken metal it makes thermite, when mixed with gun powder it makes flash powder, flash poder extremely flammable powder.
well are you going to make aluminum and alminum powder if your doing both aluminum is a solid, melts when under pressure it turns to aluminum powder, it is extremely flammable