a method of cleaning metal or stone surfaces by sand, steel shot or grit blown from a nozzle at high velocity; also used for forming a key on the surface of various materials requiring a finish, such as enamel, peamiselt puhastamise otstarbel rakendatav metalli vm. pindade (näit. valandite pindade, hoonete fassaadide) töötlemine, mille korral vastu pinda juhitakse liivaterasid sisaldav õhujuga