Kauri na faifan tungsten yana shafar abubuwa daban-daban, gami da aikace-aikacen da aka yi niyya, kaddarorin injina da tsarin masana'antu.Wasu mahimman dalilai masu alaƙa da kauri tungsten sun haɗa da:

1. Aikace-aikacen buƙatun: takamaiman aikace-aikacen takardar tungsten yana taka muhimmiyar rawa wajen tantance kauri da ake buƙata.Misali, a aikace-aikacen kariya na radiation, ana iya buƙatar fayafai na tungsten masu kauri don samar da isasshen kariya, yayin da ƙananan faifai na iya dacewa da kayan lantarki ko masana'antar semiconductor.

2. Ƙarfin injina: An zaɓi kauri na takardar tungsten yawanci don saduwa da buƙatun ƙarfin injin, kamar jure yanayin zafi, matsa lamba ko juriya.Fayafai masu kauri suna ba da ƙarfin injina da dorewa a cikin yanayi mara kyau.

3. Machining da masana'antu matakai: Tsarin masana'antu da ake amfani da su don samar da fayafai na tungsten, irin su mirgina, ƙirƙira ko machining, yana rinjayar kauri da za a iya samu.Ƙarfin kayan aikin masana'anta da tsari na iya ƙayyade kewayon kauri waɗanda za a iya dogara da su.

4. La'akari da nauyi da sarari: A wasu aikace-aikace, nauyi da girman faifan tungsten sune abubuwa masu mahimmanci.Lokacin da maƙasudin nauyi da sarari suke da mahimmanci (kamar a sararin samaniya ko ƙananan na'urorin lantarki), ƙila a fi son fayafai masu sirara.

5. Ƙimar Material da Samuwar: Farashin da samuwa na tungsten abu kuma yana rinjayar zabin kauri na faifai.Faifai masu kauri na iya buƙatar ƙarin kayan aiki da sarrafawa, mai yuwuwar tasiri farashi da samuwa.

Tare da waɗannan abubuwan a hankali, an zaɓi kauri na faifan tungsten dangane da haɗin ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun kayan aikin injiniya, ƙwarewar masana'anta, da la'akari da farashi.