Polyamide plastic, uas fe ntau hu ua Nylon, yog ib qhov kev lag luam siv khoom tshuab thermoplastic uas muaj qhov txuj ci ntau, nyob rau hauv qhov muaj kev txam txim zoo, kev nyob dav, thiab kev txaus siab rau kub. Nws cov molecular structure, uas muaj repeating amide linkages, tsim tau cov hydrogen bonds meej ntau ntawm cov kab, ua rau muaj kev ceev meej thiab qhov melting point nyob saum toj compared to ntau yam lwm yav plastics. Qhov structure no muab nws cov kev nyob ruv zoo thiab kev txaus siab rau kev raug tag nrho lossis kev load dua. Nws muaj neeg paub tseem ceeb tias tsis tuaj yeem xeeb tau thiab muaj coefficient of friction tsuas yog, ua rau nws zoo rau siv rau cov cuab yeej tso tseg los yog gears. Ib qhov tseem ceeb ntawm nws qhov kev txam txim yog nws kev sib phim rau hauv dej; raws li ib qhov material hygroscopic, nws yuav absorpt moisture tshaj plaws los ntawm av. Qhov dej uas nws absorpt no ua haujlwm li ib qhov plasticizer, pab txhim kho kev nyob ruv thiab kev txaus siab rau kev raug tag nrho, tab sis rov cuag ntxiv rau kev tsis muaj zog thiab kev tsis nyob nrog. Yog li, ib qhov "dry as molded" part yuav muaj zog thiab ceev, tab sis brittl, thaum li ib qhov "conditioned" part yuav nyob ruv, tab sis tsis ceev. Qhov sensitivity to moisture no yuav tsum tau sau ua ntej kom sai ua ntej khiav haujlwm kom tiv thaiv kev puas tsuaj thiab kev thim los ntawm cov properties. Polyamide plastic yog ib qhov yooj yim khiav haujlwm los ntawm injection molding thiab extrusion mus rau hauv ib txheej ntau yam components, los ntawm cov electrical connectors thiab fasteners kom txog cov fibers nyob dav rau textiles thiab ropes. Nws cov kev sib xyeeb ntawm cov properties tau pab nws nyob ib qhov chaw tseem ceeb hauv ntau yam kev lag luam, xws li automotive, electronics, consumer appliances, thiab industrial machinery.