The formation/decomposition of several compounds from the pyrolysis of tire
wastes is compared in three different types of equipment. The types of lab
oratory equipment consist of a Pyroprobe, where the secondary reactions are
minimized, and a horizontal pyrolysis furnace, where the cracking is sever
e. The yields obtained in both types of equipment are compared with those p
reviously obtained in a fluidized bed reactor. On the other hand, the kinet
ic severity function (KSF) has been proposed as a measure of the cracking u
ndergone by the tars produced. This paper focuses on the production of semi
volatiles from tire wastes.