The burning test and the density float test are the two most effective methods for differentiating automotive exterior plastics. Kev siv lawv ua ke tuaj yeem txheeb xyuas cov khoom siv tau yooj yim thiab meej.
1. Kev Ntsuas Hluav Taws Xob: Ua kom pom tseeb cov khoom siv tshuaj lom neeg Los ntawm kev soj ntsuam cov nplaim xim, pa taws, tsw ntxhiab, thiab yaj tus cwj pwm thaum combustion, cov yas sib txawv tuaj yeem ua tau zoo:
PP (Polypropylene): Cov nplaim daj nyob rau sab saum toj thiab xiav nyob rau hauv qab, nrog cov paraffin - zoo li tsis hnov tsw, pom tseeb ntws tom qab yaj, zoo ib yam li cov tswm ciab hlawv.
ABS: Cov nplaim daj nrog cov pa luam yeeb dub, tawm cov ntxhiab tsw ntxhiab styrene (zoo ib yam li cov roj hmab hlawv), maj mam poob.
PC (Polycarbonate): Cov nplaim daj, ntau cov pa luam yeeb dub, nrog cov ntxhiab tsw qab, yaj tab sis tsis poob.
ASA: Cov nplaim daj, cov pa luam yeeb dub, tsw zoo ib yam li ABS tab sis me me, tsis yooj yim drip.
Nws raug nquahu kom tsuas yog sim nrog cov qauv me me ntawm cov khoom seem hauv qhov dej - qhov chaw cua kom tsis txhob nqus cov pa phem.
2. Ceev Float Test: Ib txoj hauv kev yooj yim thiab siv tau zoo
PP: Qhov ceev kwv yees li 0.9 g / cm³, ntab rau hauv dej, ua rau nws yog ib qho ntawm ob peb yam khoom yas uas muaj peev xwm ntab.
ABS, PC, ASA, TPO: Densities are all greater than 1, sink in water, and can be quickly distinguished from PP.
3. Kev Txiav Txim Siab Muaj Kev Ntseeg Siab Tshaj
Ib txoj hauv kev tuaj yeem ua rau muaj kev pheej hmoo ntawm kev txiav txim tsis raug. Nws raug pom zoo kom muab cov tsos, gloss, tactile elasticity, thiab suab thaum tapped raws li cov cim qhia:
PP xav tias mos thiab elastic, thiab ua rau lub suab dull thaum tapping;
ABS yog ib qho nyuaj, muaj lub siab gloss, thiab ua lub suab nrov thaum tapping;
PC yog pob tshab, muaj zog tiv thaiv, thiab tsis yooj yim khawb.
