Ukukhetha ukuvumelana okulungile kweamafutha okufaka isiceloKubaluleke kakhulu, njengoba igrisi ethambile kakhulu ingase isuke endaweni edinga ukugcotshwa, kuyilapho igrisi eqine kakhulu ingase ingafuduki ngempumelelo iye ezindaweni ezidinga ukugcotshwa.

Ngokwesiko, ukuqina kwegrisi kuboniswa inani lokungena futhi kuhlolwa kusetshenziswa ishadi lebanga le-National Lubricating Grease Institute (NLGI).Inombolo ye-NLGI iyisilinganiso sokungaguquguquki kwegrisi njengoba kuboniswa inani layo lokungena elisetshenziwe.

Iukuhlolwa kokungenaikala ukuthi ikhoni evamile iwela ekujuleni kwesampula kagrisi endaweni eyishumi yamamilimitha.Ibanga ngalinye le-NLGI lihambisana nebanga elithile lokungena elisetshenziwe.Amanani okungena aphezulu, njengalawo angaphezu kuka-355, abonisa inombolo yebanga le-NLGI ephansi.Isikali se-NLGI sisuka ku-000 (semi-fluid) siye ku-6 (ibhulokhi eliqinile elifana nokusabalalisa ushizi we-cheddar).

I-viscosity kawoyela eyisisekelo kanye nenani le-thickener lithonya kakhulu izinga le-NLGI lamafutha okugcoba aqediwe.Ama-thickeners kugrisi asebenza njengesipontshi, adedela uketshezi lokuthambisa (uwoyela oyisisekelo kanyeizithasiselo) uma kusetshenziswa amandla.

Uma kuphezulu ukufana, igrisi imelana kakhulu nokukhipha uketshezi lokugcoba ngaphansi kwamandla.Igrisi enokungaguquguquki okuphansi izokhipha uketshezi lokugcoba kalula.Ukungaguquguquki kwamafutha okulungile kubalulekile ukuze kuqinisekiswe ukuthi inani elifanele loketshezi lokuthambisa liyanikezwa futhi ligcinwe ohlelweni ukuze kugcotshwe ngendlela efanele. 

NLGI Amabanga 000-0

Amafutha angena ngaphansi kwalawa mabanga ahlukaniswa ngoketshezi kuya kububanzi boketshezi oluncane futhi avame ukuba ne-viscous encane kunamanye.Lawa mabanga amafutha angaba yinzuzo ezinhlelweni ezivalekile nezibekwe endaweni eyodwa, lapho ukufuduka kwamafutha kungeyona inkinga.Isibonelo, ibhokisi legiya lidinga ugrisi ngaphakathi kwalolu hlu lwe-NLGI ukuze ligcwalise ngokuqhubekayo okokugcoba endaweni yokuxhumana.

NLGI Amabanga 1-3

Igrisi enezinga loku-1 le-NLGI inokungaguquguquki okufana ne-tomato unama, lapho amafutha anezinga le-NLGI lika-3 anokulingana okufana nebhotela.Amagrisi asetshenziswa kakhulu, njengalawo asetshenziswa kumabheringi ezimoto, angasebenzisa okokugcoba okuyibanga lesi-2 le-NLGI, elinokuqina kwebhotela lamantongomane.Amabanga angaphakathi kwalolu banga angasebenza ebangeni lokushisa eliphakeme futhi ngesivinini esiphezulu kune-NLGI amabanga 000-0.Amafutha ama-bearingsngokuvamile i-NLGI grade 1,2, noma 3.

NLGI Amabanga 4-6

Amabanga e-NLGI ahlelwe ku-4-6 anokufana okufana no-ayisikhilimu, i-fudge noma ushizi we-cheddar.Kumadivayisi ahamba ngesivinini esikhulu (okuzungezayo okungaphezulu kuka-15,000 ngomzuzu) kufanele kucatshangelwe igrisi ye-NLGI yebanga lesi-4.Lawa madivaysi athola ukungqubuzana okwengeziwe nokwakheka kokushisa, ngakho-ke kudingeka amafutha aqinile, ahambayo.Amagrisi amashaneli adudulwa kalula kakhulu ku-elementi njengoba iphenduka, ngaleyo ndlela kuholele ekunyakazeni kancane kanye nokuzuza kancane kwezinga lokushisa.Isibonelo, i-Nye's Rheolube 374C igrisi ye-NLGI yebanga lesi-4 esetshenziswa ekukhiqizeni isivinini esikhulu esinebanga lokushisa elibanzi elingu -40°C kuya ku-150°C.Amafutha ane-NLGI Ibanga lesi-5 noma lesi-6 awavamile ukusetshenziswa ezinhlelweni zokusebenza.