Thermite is a metallic pyrotechnic mixture, in real life, that can undergo a vigorous oxidisation to produce vast amounts of heat in an exothermic reaction. It naturally appears to have a light rosy brown colour when spawned, and it's metallic properties mean is is one of the denser powders in the game, and it sinks through most liquids and even through some powders. Thermite's best utilisation is the store of chemical potential energy to heat energy, and can be found as a common component to pyrotechnics such as bombs and other destructive creations. It's intense heat output makes it a good fuel for reactor type saves and other similar creations.

Typical thermite contains a composite mixture of Iron oxide and aluminium. In powder toy, thermite, THRM, can be generated by the means of mixing BRMT and BREL at tempurates >280°c (553.15K). It's metallic properties means that it is a conductor of SPRK,.

THRM can be ignited by being in contact with FIRE, PLSM or LAVA. It is not ignited by heat or pressure, so it is quite a stable element. When Ignited, THRM will burn generating the same volume of "Molten thermite" at 2000°c and around 10 pressure in an open environment. If it is allowed to cool, the molten mixture will solidify at arounf 690°c, into BMTL.