Kevlar - shi ne mai roba fiber, da kimiyya sunan ne "aramid, polyparaphenylene terephthalamide." A shekarar 1965 Kamfanin DuPont na Amurka ya ci gaba. Saboda tsananin ƙarfinsa (3620 MPa), da kantattu masu kariya na musamman, nauyin nauyi da rashin ƙarfi, Kevlar ya sami aikace-aikace mai yawa a wasu fannoni. Wannan abu zai iya tsayayya da damuwa mai tsawo da wasu nauyin, ba a komai ba.
Tun daga shekarun 1970s, an yi amfani da Kevlar mai aminci da abin dogara ga samar da kasuwanci a karkashin matsanancin yanayi. Duk da haka, a farkon an tsara shi don ƙarfafa tayoyin motocin, don ƙara ƙarfin su da rage nauyi. Yanzu suna ci gaba da wannan nasara, kuma suna karfafa igiyoyin fiber-optic da kuma jan karfe don hana yaduwa da shimfiɗawa, masana'antun da aka haɗe - don magance cututtuka da abrasive. Musamman ma, daga waɗannan masana'antun an sanya su a cikin kayan tufafi na 'yan wasa da sojoji, kwalkwali da safofin hannu na Kevlar. Ƙungiyoyin kasashen da dama a duniya sun ɗauki Kevlar don makamai kuma, ta yin amfani da kayan haɓakarta, suna amfani da su a cikin kayan aikin soja da kuma ayyukan tsaro. Misali mai kyau na irin wannan amfani shine takaddun shaida.
Duk samfurori daga Kevlar suna da tsayayyar zafi da juriya ga acid da alkalis. Dalili cikakke shine Threaded safofin hannu tare da Kevlar thread: a cikin haɗari da cutarwa, wanda ake haɗuwa da yiwuwar cuts a gilashi ko takarda takarda, sadarwa tare da abubuwa masu zafi (har zuwa 100 ° C), a cikin masana'antun abinci, ginin na'ura, sufuri na gilashi da sauran ayyukan Shin irreplaceable. Kevlar safar hannu kawai tsara don kare hannun daga cuts a lokacin, misali, salla sabon kifi, kiwon kaji, nama, 'ya'yan itãcen marmari da kuma kayan lambu. Suna da haske da kuma dadi - hannayensu a cikin su "numfasawa", mai saukin isa don riƙe damuwar hannayensu kuma bada izinin yin aiki tare da kananan sassa, kuma suna samar dashi mai kyau (mailed) da bushe. Irin waɗannan safofin hannu suna samarwa ba tare da guda guda ba kuma daban-daban masu girma, saboda kowa zai iya sayan wannan magani mai sauki. Kevlar safofin hannu za a iya amfani ba kawai kamar yadda al'ada safofin hannu, amma kuma a matsayin mai rufi, da kuma matsayin fasaha. Ba su buƙatar kulawa na musamman. Wanke su iya zama a 40 ° C da tsaka tsaki abu don wanka, da kuma bukatar bushe a dakin da zazzabi. Zaka iya, idan ana so, juya su a tsaftacewa ta bushe. Bayan yin amfani da maimaitawa da wankewa, safofin hannu (mittens) na Kevlar suna riƙe da kaddarorinsu, siffar da bayyanar su, sabili da haka rayuwarsu ta dogon lokaci.
An tabbatar da shi a wasu ayyukan daban-daban Kevlar sami aikace-aikace a wasanni. Skiers, racers motar, babur racer da kuma 'yan wasan baseball gladly amfani da kevlar safofin hannu. Sarkinsu, tasiri da damuwa mai zafi zasu iya rage adadin raunin ko ya kauce musu gaba daya.
Amma Kevlar tare da wadataccen basirar yana da ƙwayoyin rashin ƙarfi. A yanayin zafi mai kyau (430-480 ° C), ya ragu, kuma a cikin zafin jiki na fiye da 150 ° C ya rasa ƙarfi. Yawan zafi da tsawon lokaci, ba shakka, kuma ya taka muhimmiyar rawa. Saboda haka, don tsawon sa'o'i 70 na zafi zuwa kimanin 250 ° C, safofin hannu na Kevlar zasu rasa kashi 50% na ƙarfin su. A yanayin zafi mai zurfi (har zuwa -190 ° C), a akasin wannan, ƙarfin da elasticity ya ci gaba. Amma a cikin rayuwar yau da kullum ba zai yiwu a kirkiro yanayin da za'a yi amfani da tsarin kwayoyin Kevlar ba.