Pulverized materials are a type of material added by Thermal Foundation. They are usually the result of a Pulverizer smashing Ores, Ingots or other kinds of materials. Thermal Foundation adds Pulverized versions of all of its base metals and alloys, and also for some materials from vanilla Minecraft.
Pulverized versions of alloys are called Blends instead. Blends are usually obtained by combining Pulverized metals.