Za prijavo snovi, ki ni vključena niti v osnovni seznam Ecoin, niti v delovni dokument z naslovom "Izpis znanih snovi" in katere registrska številka Službe za izmenjavo kemijskih izvlečkov (CAS) ni znana, mora oseba, ki izdeluje prijavo, uporabiti obrazec C (kopija je prikazana spodaj) in ga ustrezno izpolnjenega in podpisanega posredovati na nacionalni(-e) naslov(-e).
To declare a substance that is included in neither the Ecoin core inventory nor the working document "Compendium of known substances" and for which a Chemical Abstract Service (CAS) registry number is not known, the person making the declaration must use Form C (a facsimile of which is presented below) and forward it to the national address(es) duly completed and signed.