Monga zopangira matayala, mphira amatanthauza zinthu zotanuka kwambiri za polima zopindika zosinthika.Ndi zotanuka kutentha kwa firiji, zimatha kutulutsa zopindika zazikulu pansi pa mphamvu yaing'ono yakunja, ndipo zimatha kubwerera ku mawonekedwe ake oyambirira pambuyo pochotsedwa mphamvu yakunja.Rubber ndi polima kwathunthu amorphous.Kutentha kwake kwa kusintha kwa magalasi kumakhala kochepa ndipo kulemera kwake kwa molekyulu nthawi zambiri kumakhala kwakukulu, kwakukulu kuposa mazana a zikwi.
Mphira umagawidwa m'mitundu iwiri: mphira wachilengedwe ndi mphira wopangira.Labala wachilengedwe amapangidwa pochotsa chingamu kumitengo ya rabala, udzu wa rabala ndi zomera zina;mphira kupanga ndi akamagwira polymerization zosiyanasiyana monomers.
Tonse tikudziwa kuti kuumba mphira kumafunika kutentha kwambiri.Nthawi zambiri, pofuna kuwonetsetsa kuti mawonekedwe abwino a mphira amapangidwa, mafakitale a labala nthawi zambiri amagwiritsa ntchito ma jenereta a nthunzi otentha kwambiri kuti atenthetse ndikuumba mphira.
Popeza mphira ndi elastomer yotentha yosungunuka, pulasitiki ndi elastomer yosungunuka ndi kuzizira.Choncho, zinthu zomwe zimapangidwa ndi mphira zimafuna kusintha koyenera kwa kutentha ndi chinyezi nthawi iliyonse, mwinamwake kusiyana kwa khalidwe la mankhwala kungatheke.Jenereta ya nthunzi imagwira ntchito yofunika kwambiri pa izi.
Aliyense amene wakhala akukumana ndi mphira amadziwa kuti mphira yokha imafuna chithandizo cha kutentha kwapamwamba kuti apange mawonekedwe, ndipo popanga mankhwala a mphira, m'pofunikanso kugwiritsa ntchito pulasitiki yotentha yotentha ndi yozizira, yomwe imafuna kusintha kwa kutentha panthawi yopanga.Jenereta ya nthunzi ingathandize pa izi.Izi mankhwala makonda ndi Mlengi akhoza kukwaniritsa kulamulira wanzeru ndi kusintha kutentha ndi chinyezi malinga ndi zipangizo zosiyanasiyana, potero kupanga khalidwe kupanga mankhwala mphira apamwamba.
Jenereta ya Nobeth imatha kutulutsa nthunzi yotentha kwambiri ndi kutentha kwa nthunzi mpaka 171 ° C, komwe kumakhala koyenera kupanga zinthu za rabara.