Kwiilabhoratri, iikhitshi, kunye nesetingi zokuhambisa kwezonyango, iikomityi zokulinganisa iglasi zizixhobo eziyimfuneko zokulinganisa. Abantu abaninzi bazisebenzisa mihla le, ukanti bambalwa abaqwalasela indlela ekwenziwa ngayo ezo mpawu zicacileyo, ezifanayo kwiikomityi zokulinganisa, ezihambelana ngokuchanekileyo nemiqulu yolwelo.
Izidanga ezichanekileyo zixhomekeke ekuzinzeni kwezinto eziphathekayo. Isizathu esingundoqo sokuba kutheni iikomityi ezininzi zokulinganisa iglasi zisebenzisa iglasi ye-borosilicate kukuba le nto inika isiqinisekiso esisisiseko sokuthweswa izidanga. Iglasi yeBorosilicate inomlinganiso ophantsi kakhulu wokwandiswa kwe-thermal, malunga nesinye{2}}sesithathu seglasi eqhelekileyo, kwaye ayisayi konakala kakhulu ngenxa yotshintsho kubushushu bendawo. Nokuba ngowobushushu obuphezulu{4}}okanye ubambe ulwelo olushushu okanye olubandayo, umthamo wendebe uhlala uzinzile, unqanda ukunxaxha phakathi kothweso-zidanga kunye nowona mthamo ubangelwe kukwandiswa kwezinto kunye nokucutheka. Ngelo xesha, iglasi ye-borosilicate ine-texture efanayo kunye nokucaca okuphezulu, okungaququzeleli nje ukuphawula okulandela emva kokuphumelela kodwa ivumela abasebenzisi ukuba baqaphele ngokucacileyo inqanaba le-liquid, ukunciphisa iimpazamo zokufunda.
Emva kokuba umgangatho wezinto eziphathekayo uqinisekisiwe, ukuchaneka kokubumba kwendebe yokulinganisa kubeka ngokuthe ngqo ukuchaneka okusisiseko kwesikali. Kwimveliso yanamhlanje, iikomityi zokulinganisa iglasi ziyavuthelwa okanye zicinezelwe kusetyenziswa iimolds ezichanekileyo. Yonke inkqubo yokubumba kufuneka iqhutywe kwindawo yokushisa rhoqo ukukhusela i-deformation ebangelwa ukushisa okungalinganiyo ngexesha lokupholisa kweglasi. Ikomityi yokulinganisa ebunjiweyo kufuneka ihlangabezane neemfuno ezintathu eziphambili: "i-cylindricity esemgangathweni, ubukhulu bodonga obufanayo, kunye nomzantsi osicaba." Ukuba ikomityi ithambekele, umphezulu we-liquid uya kugotywa, okukhokelela ekuphambukeni kwisikali. Ukuba ubukhulu bodonga bungalingani, iidigri ezahlukeneyo zokwandiswa kwe-thermal kunye nokucutha kweglasi kuya kuphazamisa ukuzinza kwevolumu. Ukuba umzantsi awulingani, ikomityi yokulinganisa iya kuthambeka xa ibekwe, ikwachaphazela ukuchaneka komlinganiselo. Ke ngoko, iikomityi zokulinganisa ezibunjiweyo zihlolwa okokuqala ukugatya iimveliso ezinemilo ekumgangatho ophantsi, imiqobo yokucoca yokumakisha isikali esilandelayo.
Ukumakishwa kothweso-zidanga yinto ebalulekileyo kumlinganiselo ochanekileyo, kwaye ngoku sele kudlulele ngaphaya kwendlela erhabaxa yokuzoba imigca, ingena kwixesha elizisebenzelayo ngokupheleleyo. Okwangoku, kukho iindlela ezintathu eziphambili zokusetyenzwa kwamanqaku, nganye igxininise:{1}}ubushushu obuphezulu boshicilelo lweglaze, olubandakanya ukuprinta i-ceramic glaze ekhethekileyo kumzimba weglasi usebenzisa{2}}ithempleyithi echanekileyo, elandelwa-nobushushu obuphezulu ukuhlanganisa izidanga ngeglasi, iyenza ikwazi ukumelana nokunxitywa kweglasi, iyenze ikwazi ukumelana nokunxitywa kwasekhaya; umkrolo welaser, osebenzisa -ilaser yamandla aphezulu ukukrola imijelo emihle kumphezulu weglasi, ukuzuza ukuchaneka kokuphumelela kwe-0.1 ml, okuqhele ukusetyenziswa kwilabhoratri{6}}inqanaba eliphezulu{7}}iikomityi zokulinganisa ezichanekileyo; kunye nekhemikhali etching, esebenzisa isisombululo esonakalisayo ukwenza izidanga ezisisigxina kumphezulu weglasi, ivelise imigca eethe-ethe, ilungele iikomityi zokulinganisa ezichanekileyo -eziphezulu, eziphakamileyo{9} ezichanekileyo.
Nokuba yeyiphi na inkqubo esetyenzisiweyo, "ukubekwa okuchanekileyo kunye nokulinganisa okusemgangathweni" kubaluleke kakhulu. Isixhobo esizenzekelayo silungisa ikomityi yokumejarisha kwindawo ephezulu-echanekileyo, sisebenzisa umzantsi wendebe njengereferensi yokuqinisekisa ukuba ibekwe ngokuthe nkqo, kuthintela ukungahambi kakuhle kwesikali ngenxa yokuthambeka. Emva koko, isixhobo sigalela umthamo oqhelekileyo wamanzi ahlambulukileyo, angqinisiswe yimigangatho ye-metrology yesizwe, kwindebe. Kubushushu obuqhelekileyo obungama-20, isixhobo sirekhoda indawo yomgangatho wolwelo kumzimba wekomityi{5}}obu bushushu bumgangatho ovunyiweyo we-metrological wamazwe ngamazwe, apho umthamo weglasi uzinzile kwaye ubuninzi bolwelo bufana, kucutha ifuthe lobushushu ekuchanekeni. Sisebenzisa eli nqaku liphawulweyo njengesalathiso, isixhobo sitsala abathweswe izidanga ngamaxesha amiselweyo, siqinisekisa ukuba isidanga ngasinye sihambelana ngokuchanekileyo nomthamo osetiweyo.
Emva kokuba bathweswe izidanga, kufuneka bavavanywe ngokucokisekileyo ngaphambi kokuba bathunyelwe emarikeni. Inkqubo yovavanyo isebenzisa imodeli "yenqaku-nge{2}}yokuqinisekisa", apho abasebenzi basebenzisa iibhalansi zombane (ngokuchaneka ukuya kuthi ga kwi-0.001 grams) okanye izixhobo zokulinganisa ezisemgangathweni zokuqinisekisa zonke izidanga ezibaluleke kakhulu kwikomityi yokulinganisa. Umzekelo, kwi-100 ml yokuphumelela isidanga, eyona mpazamo yevolumu yolwelo olutofiweyo kufuneka ilawulwe ngaphakathi koluhlu olumiselweyo kuzwelonke: hayi ngaphezulu kwe-±0.1 ml yelabhoratri{7}}iikomityi zokulinganisa zebakala A, kwaye zingabi ngaphezulu kwe ±1 ml kwiikomityi zokulinganisa zasekhaya eziqhelekileyo. Iimveliso ezingaphaya kolu luhlu lweempazamo zaliwe ngokuthe ngqo. Ngaphaya koko, abasebenzi abavavanyayo bajonga ukucaca kunye nokwahluka kombala kwabaphumeleleyo ukuqinisekisa ukufundwa lula ngabasebenzisi kunye nokunciphisa iimpazamo ezibonakalayo.