Roba na halittaya dace da ruwa, ruwan teku, iska, iskar gas mai inert, alkali, ruwan gishiri da sauran hanyoyin sadarwa, amma ba ya jure wa man ma'adinai da sauran abubuwan da ba su da alaƙa da polar, zafin amfani na dogon lokaci bai wuce 90℃ ba, ƙarancin zafin jiki yana da kyau kwarai, ana iya amfani da shi sama da -60℃.

  Robar Nitrileya dace da kayayyakin mai, kamar man fetur, man shafawa, man fetur, da sauransu, zafin amfani na dogon lokaci shine 120℃, kamar a cikin mai mai zafi zai iya jure 150℃, ƙarancin zafin jiki shine -10~-20℃.

  Roba na Neopreneya dace da ruwan teku, acid mai rauni, alkaline mai rauni, maganin gishiri, kyakkyawan juriya ga iskar oxygen da tsufa na ozone, juriyar mai ya yi ƙasa da robar nitrile kuma ya fi sauran robar gabaɗaya kyau, zafin amfani na dogon lokaci ƙasa da 90℃, matsakaicin zafin amfani bai wuce 130℃ ba, ƙarancin zafin jiki shine -30~-50℃.

Akwai nau'ikan iri da yawarobar fluorineSuna da juriyar acid mai kyau, juriyar iskar shaka da juriyar mai, juriyar narkewar ruwa. Ana iya amfani da su a kusan dukkanin hanyoyin acid da kuma wasu mai da sauran sinadarai, zafin amfani na dogon lokaci bai wuce 200℃ ba.

Takardar roba a matsayin gasket mai flange, galibi ana amfani da ita don bututun mai ko kuma ramukan da aka wargaza, ramukan hannu, matsin lambar bai wuce 1.568MPa ba. Domin a cikin kowane nau'in gaskets, gaskets na roba sune mafi laushi, aiki mai kyau na haɗin kai, kuma suna iya yin tasirin rufewa a ƙarƙashin ƙaramin ƙarfin ɗaukar kaya. Saboda haka, lokacin da aka fuskanci matsin lamba na ciki, yana da sauƙin matsewa saboda kauri ko ƙarancin taurin gasket ɗin.

Takardar roba da ake amfani da ita a cikin benzene, ketone, ether da sauran sinadarai masu narkewa na halitta, mai sauƙin bayyana kumburi, ƙaruwar nauyi, laushi, mannewa, wanda ke haifar da gazawar hatimi. Gabaɗaya, idan matakin kumburi ya wuce kashi 30%, ba za a iya amfani da shi ba.

Idan akwai ƙarancin matsi (musamman ƙasa da 0.6MPa) da kuma injin tsabtace iska, amfani da ƙusoshin roba ya fi dacewa. Kayan robar yana da kyau da yawa kuma yana da ƙarancin iskar shiga. Misali, robar fluorine ta fi dacewa don rufe gaskets na kwantena na injin tsabtace iska, kuma matakin injin tsabtace iska ya kai 1.3×10-7Pa. Lokacin da aka yi amfani da ƙusoshin roba a cikin kewayon digiri na injin tsabtace iska na 10-1~10-7Pa, yana buƙatar a gasa shi a kuma yi famfo.