The important parameters are :
-Sulphur modification (thiurm grades,ability to masticate the rubber);
-Mercaptan modification (mercaptan grades);
-Polymerization temperature (tendency to crystallize);
-Modifier (different Mooney viscosities, processibility);
-Stabilizer (colour and storage stability);
-Copolymerization with other monomers (tendency to crystallize);
-Precrosslinking (processing behavior)
-Reactive goups (ability to crosslink without sulphur and accelerator. Only important for lattices. ).