Roba na halitta zai iya jure wa sinadarai kamar ruwan sha, ruwan gishiri, iska, iskar gas mara amfani, alkalis, da kuma ruwan gishiri; duk da haka, man ma'adinai da sauran sinadarai marasa polar za su lalata shi. Yana aiki sosai a ƙananan yanayin zafi kuma yana da zafin amfani na dogon lokaci wanda bai wuce 90°C ba. Yana aiki a -60°C. Yi amfani da misalin da ke sama.
An yarda da haɗakar mai da suka haɗa da man fetur, man shafawa, da man fetur don robar nitrile. Yanayin zafin da za a iya amfani da shi na dogon lokaci shine 120°C, 150°C a cikin mai mai zafi, da kuma -10°C zuwa -20°C a ƙananan yanayin zafi.
Ruwan teku, acid mai rauni, alkalis mai rauni, maganin gishiri, kyakkyawan juriya ga iskar oxygen da tsufa na ozone, juriya ga mai wanda bai kai na robar nitrile ba amma ya fi sauran robar gabaɗaya, yanayin zafi na dogon lokaci wanda yake ƙasa da 90 °C, matsakaicin zafin amfani wanda bai fi 130 °C ba, da ƙarancin zafin jiki tsakanin -30 da 50 °C duk sun dace da robar chloroprene.
Roba mai suna fluorine yana zuwaa cikin nau'o'i daban-daban, waɗanda duk suna da kyakkyawan juriya ga acid, oxidation, mai, da kuma narkewar sinadarai. Zafin amfani na dogon lokaci yana ƙasa da 200°C, kuma ana iya amfani da shi tare da kusan dukkanin hanyoyin acid da kuma wasu mai da sauran sinadarai.
Ana amfani da zanen robar a matsayin gasket mai lanƙwasa don bututun mai ko kuma galibi ana rushe ramukan hannu da ramukan hannu, kuma matsin lambar bai wuce 1.568MPa ba. Gaskets na roba sune mafi laushi da mafi kyau wajen haɗawa tsakanin dukkan nau'ikan gaskets, kuma suna iya haifar da tasirin rufewa da ɗan ƙarfin matsewa. Saboda kauri ko rashin taurinsa, don haka ana matse gasket ɗin cikin sauƙi lokacin da yake ƙarƙashin matsin lamba na ciki.
Ana amfani da zanen roba a cikin sinadarai masu narkewa kamar benzene, ketone, ether, da sauransu waɗanda zasu iya haifar da gazawar hatimi saboda kumburi, ƙaruwar nauyi, laushi, da mannewa. Gabaɗaya, ba za a iya amfani da shi ba idan matakin kumburin ya fi kashi 30%.
Famfon roba sun fi dacewa a yanayin injin tsabtace iska da ƙarancin matsi (musamman ƙasa da 0.6MPa). Ruwan roba yana da yawa kuma iska tana iya ratsawa zuwa ɗan lokaci. Ga kwantena na injin tsabtace iska, misali, robar fluorine tana aiki mafi kyau a matsayin gasket mai rufewa tunda matakin injin tsabtace iska zai iya kaiwa har zuwa 1.310-7Pa. Dole ne a gasa famfon robar a kuma yi famfo kafin a yi amfani da shi a cikin kewayon injin tsabtace iska na 10-1 zuwa 10-7Pa.
Duk da cewa an ƙara roba da sauran abubuwan cikawa a cikin kayan gasket, babban abin da ke faruwa shi ne har yanzu ba zai iya rufe ƙananan ramukan da ke wurin gaba ɗaya ba, kuma akwai ɗan ƙaramin matakin shiga ciki duk da cewa farashin ya yi ƙasa da sauran gaskets kuma yana da sauƙin amfani. Saboda haka, ko da matsin lamba da zafin jiki ba su wuce kima ba, ba za a iya amfani da shi a cikin hanyoyin da ke gurɓata sosai ba. Saboda carbonization na roba da abubuwan cikawa lokacin da aka yi amfani da su a cikin wani mai mai zafi, yawanci kusa da ƙarshen amfani, ƙarfin yana raguwa, kayan yana kwance, kuma shigarwa yana faruwa a mahaɗin da kuma cikin gasket, wanda ke haifar da coking da hayaki. Bugu da ƙari, a yanayin zafi mai yawa, takardar roba ta asbestos tana manne da saman rufewar flange cikin sauƙi, wanda ke rikitar da tsarin maye gurbin gasket ɗin.
Rike ƙarfin kayan gasket yana ƙayyade matsin lamba na gasket a cikin kafofin watsa labarai daban-daban a cikin yanayi mai zafi. Kayan da ke ɗauke da zare na asbestos suna ɗauke da ruwan crystallization da ruwan sha. Sama da 500°C, ruwan crystallization yana fara zubewa, kuma ƙarfin yana ƙasa. A 110°C, kashi biyu bisa uku na ruwan sha tsakanin zare ya zube, kuma ƙarfin shaƙar zare ya ragu da kusan 10%. A 368°C, duk ruwan shaƙar ya zube, kuma ƙarfin shaƙar zare ya ragu da kusan kashi 20%.
Ƙarfin takardar roba ta asbestos yana da tasiri sosai ta hanyar amfani da matsakaici. Misali, ƙarfin tururin da ke ratsawa na takardar roba ta asbestos mai jure wa mai lamba 400 ya bambanta tsakanin mai mai shafawa na jiragen sama da man fetur na jiragen sama da kashi 80%, wanda hakan ya faru ne saboda kumburin roba a cikin takardar da man fetur na jiragen sama ya fi tsanani fiye da na man shafawa na jiragen sama. Dangane da abubuwan da aka ambata a sama, yanayin zafin aiki mai aminci da matsin lamba na takardar roba ta asbestos ta gida XB450 shine 250 °C zuwa 300 °C da 3 3.5 MPa; matsakaicin zafin da takardar roba ta asbestos mai jure wa mai lamba 400 shine 350 °C.
Ana samun sinadarin chloride da sulfur a cikin takardar roba ta asbestos. Flanges na ƙarfe na iya gina batirin tsatsa da sauri bayan sun sha ruwa. Musamman ma, takardar roba ta asbestos mai jure wa mai yana da sinadarin sulfur wanda ya fi na robar asbestos na yau da kullun sau da yawa, wanda hakan ya sa bai dace a yi amfani da shi a cikin hanyar da ba ta da mai. A cikin hanyar mai da mai, gasket ɗin zai kumbura, amma har zuwa wani lokaci, ba shi da tasiri ga ikon rufewa. Misali, ana yin gwajin nutsewa na awanni 24 a cikin man jirgin sama a zafin ɗaki akan takardar roba ta asbestos mai jure wa mai lamba 400, kuma an wajabta cewa ƙaruwar nauyi da shan mai ya haifar bai kamata ya wuce kashi 15% ba.
Lokacin Saƙo: Afrilu-20-2023
