Daim ntawv thov:Lub pob zeb tshuab yog ib yam khoom siv uas yog siv los zom ores thiab lwm yam ntaub ntawv nrog ntau yam hardness. Nws yog dav siv nyob rau hauv non-ferrous thiab ferrous hlau ua, tshuaj, tsev cov ntaub ntawv thiab lwm yam industries raws li cov khoom tseem ceeb nyob rau hauv kev sib tsoo lub lag luam.