Kayayyaki

Babban elasticity:low na roba modulus, babban elongation nakasawa, recoverable nakasawa, kuma zai iya kula da elasticity a cikin wani m zafin jiki kewayon (-50 ~ 150 ℃);

Viscoelasticity:kayan roba yana da a fili shakatawa na danniya da kuma al'amari mai rarrafe a ƙarƙashin rinjayar yanayin zafi da lokacin lokacin da ya haifar da nakasawa kuma ya dawo da nakasar.Ƙarƙashin aikin rawar jiki da matsananciyar damuwa, yana haifar da asarar hysteresis.

Wutar lantarki:kamar lalatawar karfe, lalata itace da yanayin dutse, roba kuma za ta tsufa saboda sauyin yanayin muhalli, wanda zai tabarbare aikinsa da kuma rage masa hidima.

Vulcanization:roba dole ne a "vulcanized" kafin amfani, sai dai thermoplastic elastomers.

Wakilin hadawa:dole ne a ƙara roba tare da "wakilin haɗawa".

Abubuwan da ke sama sune mafi mahimmancin halayen roba.Sauran halaye, irin su ƙayyadaddun ƙayyadaddun nauyi, ƙarancin ƙarfi, laushi mai kyau da ƙarancin iska, suma halaye ne masu mahimmanci na roba.