Dej-raws li txheej yog cov kua nplaum nrog cov resin, lossis roj, lossis emulsion ua tus neeg sawv cev tseem ceeb, thiab cov organic hnyav lossis dej. Dej-raws li txheej nrog kev ua tau zoo heev kuj muaj kev ua haujlwm zoo, muaj zog zais zoo, muaj zog adhesion, tuav dej zoo thiab lwm yam ntxwv; Cellulose yog cov khoom siv zoo tshaj plaws los muab cov khoom no.