Kaolin wani ma'adinai ne wanda ba na ƙarfe ba, wanda nau'in yumbu ne da dutsen yumbu wanda ya ƙunshi ma'adanai na ƙungiyar Kaolinite.Saboda fari da lallausan kamanni, ana kuma kiranta da ƙasa Baiyun.An ba shi sunan kauyen Gaoling da ke Jingdezhen, lardin Jiangxi.

Tsaftataccen kaolin sa fari ne, mai laushi kuma kamar Mollisol, yana da kyawawan filastik, juriya na wuta da sauran kaddarorin jiki da sinadarai.Abubuwan da ke cikin ma'adinai sun ƙunshi Kaolinite, halloysite, hydromica, Illite, Montmorillonite, quartz, feldspar da sauran ma'adanai.Ana amfani da Kaolin ko'ina wajen yin takarda, tukwane, da kayan gyarawa, sannan ana amfani da suttura, filayen roba, glazes na enamel, da albarkatun fararen siminti.Ana amfani da ƙaramin adadin a cikin filastik, fenti, pigments, ƙafafun niƙa, fensir, kayan kwalliyar yau da kullun, sabulu, magungunan kashe qwari, magunguna, yadi, man fetur, sinadarai, kayan gini, tsaron ƙasa, da sauran sassan masana'antu.
Kaolin ya zama ma'adinai mai mahimmanci ga masana'antu da yawa kamar yin takarda, yumbu, roba, injiniyan sinadarai, sutura, magunguna, da tsaron ƙasa.

Masana'antar yumbu ita ce masana'antar farko kuma wacce aka fi amfani da ita don aikace-aikacen kaolin.Matsakaicin adadin shine 20% zuwa 30% na dabara.Matsayin kaolin a cikin yumbu shine gabatar da Al2O3, wanda ke da fa'ida ga samuwar mullite, inganta yanayin sinadarai da ƙarfi.A lokacin sintering, kaolin ya bazu don samar da mullite, yana samar da babban tsari don ƙarfin jiki.Wannan na iya hana nakasar samfur, faɗaɗa zafin harbi, kuma ya ba jiki wani matakin fari.A lokaci guda kuma, kaolin yana da wasu nau'ikan filastik, haɗin kai, dakatarwa da ikon haɗin gwiwa, wanda ke ba da yumɓun yumɓu da glaze mai kyau tare da tsari mai kyau, yana yin jikin yumbu mai dacewa don jujjuyawa, grouting da kafawa.Idan aka yi amfani da shi a cikin wayoyi, zai iya ƙara rufi kuma ya rage asarar dielectric.

Ceramics ba kawai suna da tsauraran buƙatun don filastik, mannewa, bushewar bushewa, ƙarfin bushewa, raguwar raguwa, ɓangarorin kaddarorin, juriya na wuta, da bayan harbe-harbe na kaolin, amma kuma sun haɗa da kaddarorin sinadarai, musamman kasancewar abubuwan chromogenic kamar baƙin ƙarfe. titanium, jan karfe, chromium, da manganese, wanda ke rage farin harbe-harbe kuma yana haifar da aibobi.
Abubuwan da ake buƙata don girman ƙwayar kaolin shine gabaɗaya cewa mafi kyawun mafi kyau, don haka laka na ain yana da kyakkyawan filastik da ƙarfin bushewa.Koyaya, don tafiyar da simintin gyare-gyaren da ke buƙatar saurin simintin gyare-gyare, haɓakar saurin grouting, da saurin bushewa, wajibi ne a ƙara girman ɓangarorin abubuwan.Bugu da ƙari, bambance-bambance a cikin crystallinity na Kaolinite a cikin kaolin kuma zai shafi aikin fasaha na jikin yumbura.Tare da kyakkyawan crystallinity, filastik da ikon haɗin gwiwa zai zama ƙasa, raguwar bushewa zai zama ƙarami, zafin jiki mai zafi zai kasance mai girma, kuma za a rage yawan ƙazanta;Akasin haka, filastik ɗinsa ya fi girma, bushewar bushewa ya fi girma, ƙarancin zafin jiki yana da ƙasa, kuma daidaitaccen abun ciki na ƙazanta shima ya fi girma.