Kusankha kusasinthasintha koyenera kwamafuta ntchitoNdilofunika kwambiri, chifukwa mafuta omwe ali ofewa amatha kuchoka kumalo omwe amayenera kupakidwa mafuta, pamene mafuta omwe ali owuma kwambiri sangasamukire m'madera omwe akufunikira kuti azipaka mafuta.

Mwachizoloŵezi, kuuma kwa girisi kumasonyezedwa ndi mtengo wake wolowa ndipo amawunikidwa pogwiritsa ntchito tchati chokhazikika cha National Lubricating Grease Institute (NLGI).Nambala ya NLGI ndi muyeso wa kusasinthasintha kwa girisi monga kuwonetseredwa ndi mtengo wake wolowa.

Themayeso oloweraamayesa kuya kwa kondomu yokhazikika kugwera mumtundu wamafuta mu magawo khumi a mamilimita.Gulu lililonse la NLGI limafanana ndi mtengo wamtengo wapatali womwe wagwiritsidwa ntchito.Makhalidwe apamwamba olowera, monga opitilira 355, akuwonetsa nambala yotsika ya giredi ya NLGI.Sikelo ya NLGI imachokera ku 000 (semi-fluid) mpaka 6 (chida cholimba ngati cheddar cheese kufalikira).

Kukhuthala kwamafuta oyambira komanso kuchuluka kwa thickener kumakhudza kwambiri kalasi ya NLGI yamafuta opaka mafuta omalizidwa.Zokhuthala mumafuta zimagwira ntchito ngati siponji, kutulutsa madzi opaka mafuta (mafuta oyambira ndizowonjezera) pamene mphamvu ikugwiritsidwa ntchito.

Mafutawo akamakwera kwambiri, m'pamenenso mafutawo samva mphamvu zake potulutsa madzi odzola mokakamiza.Mafuta omwe ali ndi kusinthasintha kochepa amamasula madzi otsekemera mosavuta.Kusasinthasintha kwamafuta ndikofunikira pakuwonetsetsa kuti kuchuluka koyenera kwamadzimadzi opaka mafuta kumaperekedwa ndikusungidwa m'dongosolo lopaka mafuta oyenera. 

NLGI Maphunziro 000-0

Mafuta omwe amagwera pansi pa magirediwa amagawidwa m'magulu amadzimadzi mpaka amadzimadzi ndipo amakhala osawoneka bwino kuposa ena.Magulu awa amafuta amatha kukhala opindulitsa pamagwiritsidwe otsekeredwa komanso apakati, pomwe kusamuka kwamafuta sikuli vuto.Mwachitsanzo, bokosi la giya limafunikira mafuta mkati mwa mtundu wa NLGI kuti muwonjezere mafutawo kumalo olumikizirana.

NLGI Maphunziro 1-3

Mafuta omwe ali ndi kalasi ya NLGI ya 1 ali ndi kusinthasintha ngati phwetekere phala, kumene mafuta omwe ali ndi NLGI kalasi ya 3 amakhala ndi kusasinthasintha ngati batala.Mafuta omwe amagwiritsidwa ntchito kwambiri, monga omwe amagwiritsidwa ntchito ponyamula magalimoto, amatha kugwiritsa ntchito mafuta omwe ndi NLGI grade 2, omwe amakhala ndi kuuma kwa peanut butter.Magiredi mkati mwamtunduwu amatha kugwira ntchito mosiyanasiyana kutentha komanso kuthamanga kwambiri kuposa masukulu a NLGI 000-0.Mafuta a ma bearingsnthawi zambiri amakhala NLGI giredi 1, 2, kapena 3.

NLGI Maphunziro 4-6

Makalasi a NLGI omwe ali m'gulu la 4-6 amakhala ndi kusasinthasintha ngati ayisikilimu, fudge kapena cheddar tchizi.Pazida zomwe zikuyenda mothamanga kwambiri (kuposa 15,000 kuzungulira pamphindi) mafuta a NLGI grade 4 ayenera kuganiziridwa.Zidazi zimakhala ndi mikangano yambiri komanso kutentha kwambiri, motero mafuta olimba amafunikira.Mafuta olowera amakankhidwira kutali ndi chinthucho mosavuta akamazungulira, zomwe zimapangitsa kuti pakhale kutentha pang'ono komanso kutentha pang'ono.Mwachitsanzo, Nye's Rheolube 374C ndi mafuta a NLGI giredi 4 omwe amagwiritsidwa ntchito ponyamula liwiro lalitali ndi kutentha kosiyanasiyana kwa -40 ° C mpaka 150 ° C.Mafuta okhala ndi NLGI Giredi 5 kapena 6 sagwiritsidwa ntchito nthawi zambiri.