Copper kumfa 20PPI,> 95% tsarki, kauri 12.5mm, yanke zuwa donut siffar OD 40mm, ID 7mm
Wannan samfurin don yin bincike na kayan canji na zamani.

Kumfa tagulla
10PPI, Diamita na waje = 210mm Duka cikin rami na tsakiya d = 171mm Kowane baka shine ¼ na ainihin zane Kumfa kauri 25 mm
10PPI, Diamita na waje = 29.4mm Duka cikin rami na tsakiya d = 4 mm A ko'ina cikin rami d = 3.2 ± 0.1 mm Nisa tsakanin tsakiyar ramuka z = 7.5 mm kauri mai kumfa 25 mm
Kumfa wani sinadari ne da muke amfani dashi a cikin injina don inganta yanayin zafi.

Yana da babban haɓakar iska, kusan duk pores da aka haɗa, babban yanki na musamman na pores, da ƙananan ƙarancin abubuwa.
Ana amfani da kumfa mai ƙarfe a cikin kera tsarkakewa, tacewa, tallafin catalytic, lantarki da sauran na'urori a cikin petrochemical, sararin samaniya, da kariyar muhalli.

Idan aka kwatanta da ƙarfe mai ƙyalli na gabaɗaya, kayan ƙarfe da ke ɗauke da pores ɗin kumfa yana da mafi girma porosity da girman pore, wanda zai iya kaiwa 7 mm. Tun da karfe kumfa shi ne nau'i-nau'i na nau'i-nau'i biyu wanda ya ƙunshi kwarangwal na matrix na ƙarfe na ci gaba da lokaci da lokaci mai tarwatsawa ko ci gaba da lokaci, kaddarorinsa sun dogara da matrix na ƙarfe da aka yi amfani da su, porosity da pore tsarin, kuma tsarin shirye-shiryen ya shafi su. Gabaɗaya, kayan aikin injiniya na kumfa na ƙarfe suna raguwa tare da haɓakar porosity, kuma ƙarfin wutar lantarki da ƙayyadaddun yanayin zafi shima yana raguwa sosai. Lokacin da kumfa na ƙarfe yana ƙarƙashin matsin lamba, saboda ƙarar ƙarfin ƙarfin ƙarfi da ƙarfin ƙarfin abu wanda ya haifar da rushewar pores, kumfa na ƙarfe yana da kyakkyawan tasiri na halayen halayen makamashi.