Asphaltenes are another group of hydrocarbons that help to make bitumen a thermoplastic material ​ — one that softens and flows when heated and hardens as it cools.
Asfalteenid on teine süsivesinike grupp, mis teeb bituumenist termoplastse materjali, mis muutub kuumutades pehmeks ja voolavaks, jahtudes aga tahkeks.