The buckets for heavy industry work at low speeds (0.6-1.3m/s). They are manufactured with thick walls and strong front edge. The main criteria determining choice of their material are heat-, impact- and abrasion resistance. Operation with combustible and hard products usually requires choice of nylon, that with piercing and cutting materials – urethane, and in heavy-duty service, the buckets are usually manufactured of high-strength cast iron or, to order, of steel. The correct choice of buckets provides increase of elevator productivity and service life.