Cov yas tsis degradable: Muaj tsib hom yas hauv lub neej niaj hnub, xws li polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), thiab acrylonitrile butadiene styrene copolymer (ABS). Cov tsib hom yas no yog txhua yam tsim los ntawm cov roj av thiab suav tias yog cov yas tsis degradable.
Biodegradable yas: Qhov no yog ib hom yas uas tuaj yeem los yog ib nrab los ntawm biomass thiab feem ntau hu ua cov khoom tsis muaj kuab lom thiab tsis zoo rau ib puag ncig. Biomass yog cov khoom siv raw ntawm cov keeb kwm lom neeg, tsis suav nrog cov khoom siv kos rau hauv cov qauv geological lossis petrified. Cov yas uas tuaj yeem tawg tau los ntawm cov kab mob (cov kab mob los yog cov kab mob fungi) rau hauv dej, carbon dioxide (CO2), methane (CH4), thiab biomass (xws li kev nce hauv cov lej microbial). Txawm li cas los xij, biodegradability feem ntau nyob ntawm ib puag ncig tej yam kev mob: kub, microorganisms, oxygen, thiab muaj dej.
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