I.Izicelo:
Isixhobo sovavanyo loxinzelelo lokusingqongileyo sisetyenziselwa kakhulu ukufumana isiganeko sokuqhekeka nokutshatyalaliswa kwezinto ezingezizo zesinyithi ezifana neeplastiki kunye nerabha phantsi kwesenzo sexesha elide soxinzelelo olungaphantsi kwenqanaba lokuvelisa. Amandla ezinto zokumelana nomonakalo woxinzelelo lokusingqongileyo ayalinganiswa. Le mveliso isetyenziswa kakhulu kwimveliso yeplastiki, irabha kunye nezinye izixhobo zepolymer, uphando, uvavanyo kunye namanye amashishini. Ibhafu ye-thermostatic yale mveliso ingasetyenziswa njengesixhobo sovavanyo esizimeleyo ukulungisa imeko okanye ubushushu beesampuli ezahlukeneyo zovavanyo.
II.Umgangatho weNtlanganiso:
I-ISO 4599–《 Iiplastiki - Ukuchonga ukumelana nokuqhekeka koxinzelelo lokusingqongileyo (ESC)- Indlela yokugoba umcu
GB/T1842-1999– "Indlela yokuvavanya ukuqhekeka koxinzelelo olungqongileyo lweplastiki ze-polyethylene".
I-ASTMD 1693– "Indlela yokuvavanya ukuqhekeka koxinzelelo olungqongileyo lweplastiki ze-polyethylene".