Zophwanyira nyundo nthawi zambiri zimagwiritsidwa ntchito kuphwanya miyala yamwala ndi miyala muzomera za simenti ndi mbewu za Quarry.

Nyundo ndi zida zofunika kuvala kuti ziphwanye miyala kuti ikhale yaying'ono. Sunwill kupanga nyundo mu njira zotsatirazi kuti zigwirizane ndi kuphwanyidwa kwa miyala ya laimu:

1, manganesezitsulo

2, Manganese + Tic carbides (moyo wotalikirapo)

3, Manganese + Ceramic (moyo wautali)

4, Martensitic chitsulo 

5, Martensitic/Chrome Bimetal.

6, Martensitic chitsulo + Ceramic. (moyo wowonjezera)

Chonde titumizireni kuti mumve zambiri.