Wave biam guardrails, kasancewar wani muhimmin nau'i na shingen shinge, an yi su ne daga ɓangarorin ƙarfe na ƙarfe waɗanda aka kulle kuma suna goyan bayan saƙo. Wadannan hanyoyin tsaro an tsara su ne don a yi amfani da su a waje, inda suke fuskantar yanayi na yanayi kamar hasken rana, oxygen, ozone, canjin yanayin zafi, ruwa da zafi, har ma da ƙananan ƙwayoyin cuta da kwari; duk waɗannan suna da tasiri akan tsawon rayuwar rufin kariya.
Wurin gadi na igiyoyin igiyar ruwa suna da rayuwar sabis na yawanci shekaru 5 zuwa 10 lokacin da launi ba ya canzawa sosai, ba tare da fashewa da sauran abubuwan mamaki ba. Ana adana kayan ado da mutuncin fim ɗin da aka shafa da kyau; don haka, yanayin juriya na murfin foda yana da girma musamman.
Juriya na yanayi shine ikon murfin foda don jure yanayin yanayi lokacin da aka yi amfani da shi a cikin bayyanar waje. Wani muhimmin sashi shine zafin jiki. Adadin halayen photochemical yana ninka sau biyu ga kowane haɓakar zafin jiki na °C goma. Daga cikin duk tsawon raƙuman raƙuman hasken rana, tsayin daka tsakanin 250-1400nm ya bugi ƙasa. Daga cikin infrared radiation (780-1400nm) wanda ke ba da gudummawar 42-60% na jimlar hasken rana, galibi ya shafi yanayin zafi zuwa abubuwa. Haske mai gani (380-780nm), wanda ke samar da kashi 39-53% na jimlar hasken rana, yana shafar wani abu a cikin yanayin zafi da halayen sinadaran. Ultraviolet radiation (250-400nm) da farko yana rinjayar kayan ta hanyar aikin photochemical. An gano ta hanyar bincike daban-daban cewa mafi yawan hasarar ultraviolet radiation akan resin polymer shine tsawon tsayi tsakanin 290-400 nm kuma mafi inganci a kusan 300nm. Wannan dangi na tsawon igiyoyin igiya ne ke da alhakin lalata resins na polyolefin.
Saboda haka, ana iya haɓaka kariya ta yanayin riguna na foda ta hanyar keɓance abubuwan da ke haifar da lalacewar suturar da matakan gyara su. Musamman a shekarun baya-bayan nan, an samu ci gaba sosai a kasar Sin, zabar danyen kayan da ake hadawa, da hadawa da fitar da kaya, da aikin nika da sauransu, wanda ya haifar da ingantuwar yanayin juriya.
Duk da haka, wani batu da za a ambata shi ne cewa ingancin ya bambanta sosai a tsakanin masana'antun foda a kasar Sin. Wasu daga cikinsu ma suna kula da riba fiye da inganci, don rage farashi, sake sarrafa albarkatun ƙasa, da ƙara ƙarin abubuwan da ba a iya gwadawa ba. Sakamakon rashin ingancin suturar da ke bushewa da fashe da wuri. Sabanin haka, kyawawan kayan kwalliyar foda mai inganci na iya taimakawa wajen kiyaye raƙuman igiyoyin igiyar igiyar ruwa a cikin yanayin sabis don shekaru 5-10 kuma ya fi tsayi.
A halin yanzu, ruwan sama na iya haifar da hydrolysis da shayar da ruwa, wanda ke lalata fim ɗin shafa. A lokaci guda kuma, yana iya wanke datti da samfuran tsufa daga saman layin tsaro, yana rage aikin kariya da tsarin tsufa.
Ana iya kimanta juriyar yanayi ta amfani da hanzari da gwaje-gwajen yanayi na yanayi. Daga ingantattun gwaje-gwajen yanayi, ana iya samun tsinkaya game da daidai lokacin tsufa na waje game da tasirin yanayi. Idan aka kwatanta, gwaje-gwajen bayyanar da dabi'a za su sami sakamako mai ma'ana; duk da haka, waɗannan gwaje-gwajen za su cinye lokaci mai yawa.