Ukukhetha phakathi kwe-polyester flat isilingi kunye ne-nylon flat isilingi asingombandela wokuba enye 'ingcono' kunomnye-kuxhomekeke ngokupheleleyo kwimeko yesicelo. Zombini izixhobo zabelana ngemilinganiselo efanayo yomthwalo wokusebenza kunye noluhlu lweqondo lokushisa (-40 ° C ukuya kwi-100 ° C) phantsi kwe-EN 1492-1, kodwa zihluke kakhulu ekwandiseni, ukuchasana kweekhemikhali, kunye nokuphendula komswakama. Inayiloni yolula i-6-10% kumthwalo olinganisiweyo kwaye ixhathisa i-alkali kodwa itshatyalaliswe ziiasidi. I-polyester yolula kuphela i-3-4% kwaye ixhathisa i-asidi kodwa yonakaliswe yi-alkalis. Esi sikhokelo sinika uthelekiso oluneenkcukacha zokunceda iinjineli kunye neengcali zokurhweba ukuba zikhethe izinto ezifanelekileyo zesilingi esicaba kwiimeko zabo zokusebenza ezithile.
Ukwazi ixesha lokutshintsha izilingi ezisicaba kubalulekile ekukhuselweni kokhuseleko kunye nokuthotyelwa kwemithetho. Imigangatho yeShishini i-ASME B30.9 kunye ne-EN 1492-1 ichaza amanqanaba amabini okuhlola-rhoqo (ukusetyenziswa kwemihla ngemihla okanye kwangaphambili) kunye namaxesha (ngonyaka okanye okwesiqingatha sonyaka)-ngalinye lineenqobo ezikhethekileyo zokumisela ukuba isilingi kufuneka sisuswe nini enkonzweni. Esi sikhokelo sichaza umahluko phakathi kokuhlolwa rhoqo kunye namaxesha ngamaxesha, sibonelela ngoluhlu lokukhangela oluneenkcukacha ngalunye, kwaye sichaza iindlela zomhlalaphantsi ezibangela ukutshintshwa kwesilingi. Kubaphathi bokurhwaphiliza, abaphathi bokhuseleko, kunye nabaqhubi, le yireferensi ebonakalayo yokugcina uluhlu olukhuselekileyo lwesilingi.
Isilingi esicaba asipheleli nje ekuwuphakamiseni umthwalo—siyawukhusela. Umphezulu obanzi, othe tyaba wewebhu usasaza ubunzima bomthwalo kwindawo enkulu, inciphisa ngokubonakalayo uxinzelelo kuyo nayiphi na indawo enye. Lo ngumgaqo-siseko osisiseko wefiziksi emva kwezilingi ezisicaba: Uxinzelelo = Force ÷ Indawo. Ngokunyusa indawo yokunxibelelana, izilingi ezicaba zinciphisa umngcipheko wokonakaliswa komhlaba, amazinyo, kunye nokutyumza-ukwenza kube lukhetho olukhethiweyo lokuphakamisa izinto ezithambileyo, ezigqityiweyo, okanye ezonakaliswe lula. Esi sikhokelo sichaza i-physics yokusabalalisa uxinzelelo, uthelekisa ii-slings flat kunye nezinye izisombululo zokuphakamisa, kwaye unikeze isikhokelo esisebenzayo sokukhetha ububanzi obufanelekileyo be-sling kwisicelo sakho.
Umgaqo we-1/10 ngumgaqo ocacileyo kodwa obalulekileyo wokuthatha umhlalaphantsi kwi-slings flat: xa ukugqoka kwe-abrasive kunciphisa ububanzi bewebhu nge-1/10 okanye ngaphezulu, i-sling kufuneka isuswe kwinkonzo. Lo mgaqo uchazwe kwi-EN 1492-1 kwaye iqatshelwe ngu-ASME B30.9 njengesalathisi esibalulekileyo sokugqoka ngokugqithiseleyo. Esi sikhokelo sichaza ukuba umgaqo we-1/10 uthetha ukuthini, indlela yokulinganisa ububanzi bewebhu ngokuchanekileyo, kutheni lo mqobo ukhethwe, kunye nendlela yokuyisebenzisa ekuhlolweni kwansuku zonke. Kubaphathi be-rigging kunye neengcali zokhuseleko, ukuqonda lo mgaqo olula kunokuthintela ukusetyenziswa kwezilingi eziyingozi.