Synthetic resin yog ib hom kev sib xyaw ua ke ntawm cov khoom siv hluav taws xob polymer, uas yog ib hom ntawm cov resin uas muaj lossis ntau dua cov yam ntxwv ntawm cov khoom siv ntuj tsim. ASTM D883-65T txhais cov khoom siv hluavtaws ua cov khoom, cov khoom ib nrab lossis pseudo (quasi) cov khoom organic ntawm cov khoom hnyav uas tsis tau teev tseg tab sis feem ntau ntawm qhov hnyav molecular uas muaj lub siab ntws thaum muaj kev ntxhov siab, feem ntau muaj softening lossis melting ntau thiab yog Shell-shaped.
