Sassan tsarin yumbu kalma ce ta gabaɗaya ta siffofi daban-daban masu rikitarwa na sassan yumbu. An yi su da foda mai tsarki, ana samar da sassan yumbu ta hanyar matsi busasshe ko matsi mai sanyi, sannan a niƙa su a ƙarƙashin zafin jiki mai yawa, sannan a yi musu daidai. Ana amfani da shi sosai a cikin kayan aikin semiconductor, sadarwa ta gani, laser, kayan aikin likita, man fetur, ƙarfe, masana'antar lantarki tare da fasalulluka kamar juriyar zafin jiki mai yawa, juriyar tsatsa, juriyar abrasion da rufi