Definicija: Highly absorbent agents used for physically removing spilled oil in case of leakages and oil accidents occurring in water bodies, industry, work-shops, on roads, etc. Materials that have been found useful for this service vary from simple, naturally occurring materials such as straw, sawdust, and peat to synthetic agents, such as polyurethane foam and polystyrene powder.

Definicija: Visoko vpojna snov, ki se v primeru izlitja in nesreč z nafto v vodnih telesih, industriji, delavnicah, na cestah in podobno, uporablja za fizično odstranjevanje razlitega olja. Sredstva, ki so se izkazala za uporabna v teh primerih, so različna, od preprostih, v naravi pojavljajočih se snovi kot so slama, žaganje in šota, do umetnih snovi, kot so poliuretanska pena in polistirenski prah.