Tsis yog . 1 PET (Polyethylene Terephthalate)
Feem ntau pom muaj nyob rau hauv lub raj mis dej ntxhia, carbonated haus fwj, thiab lwm yam. Nws deforms yooj yim thaum raug tshav kub tshaj 70℃thiab tej zaum yuav leach tshuaj phem rau tib neeg lub cev. Tom qab 10 lub hlis ntawm kev siv, nws yuav tso tawm cov carcinogen DEHP. Tsis txhob cia nws nyob hauv lub tsheb uas raug tshav ntuj; tsis txhob siv nws los khaws cawv, roj, lossis cov khoom zoo sib xws.
Tsis muaj . 2 HDPE (High-Ntev Polyethylene)
Feem ntau pom muaj nyob rau hauv cov fwj tshuaj dawb, ntxuav cov ntim khoom, thiab cov khoom siv da dej. Tsis txhob rov siv dua li lub khob haus lossis ua lub thawv rau lwm yam khoom. Tsis txhob rov siv dua yog tias tsis huv huv.
Tsis yog . 3 PVC (Polyvinyl Chloride)
Feem ntau pom muaj nyob rau hauv raincoats, siv cov ntaub ntawv, yas qhwv, yas thawv, thiab lwm yam. Nws yog dav siv vim nws zoo heev plasticity thiab tsis tshua muaj nqi, tab sis nws yog kub- resistant tsuas yog mus txog 81 degree. Cov khoom tsis zoo tuaj yeem tso tawm ntawm qhov kub thiab txias; nws tsis tshua muaj siv rau ntim khoom noj. Nws yog qhov nyuaj rau kev ntxuav thiab ua rau cov khoom seem; tsis txhob rov siv dua. Tsis txhob yuav yog siv los tuav dej haus.
Tsis yog . 4 PE (Polyethylene)
Feem ntau pom muaj nyob rau hauv cling zaj duab xis, yas qhwv, thiab lwm yam. Cov khoom tsis zoo yog tsim los ntawm qhov kub thiab txias; yog tias cov co toxins nkag mus rau hauv lub cev los ntawm cov zaub mov, lawv tuaj yeem ua rau muaj mob xws li mob qog noj ntshav mis lossis kev tsis haum xeeb hauv cov menyuam mos. Tsis txhob muab cling zaj duab xis rau hauv lub microwave.
Tsis yog . 5 PP (Polypropylene)
Feem ntau pom muaj nyob rau hauv cov kua mis nyuj fwj, yogurt fwj, kua txiv hmab txiv ntoo fwj, thiab cov thawv ntim khoom noj microwaveable. Nws muaj qhov melting point txog li 167℃thiab yog tib hom yas ntim khoom haum rau siv microwave; nws tuaj yeem rov siv tau tom qab ua tib zoo tu. Nco ntsoov tias qee lub thawv microwaveable muaj lub cev ua los ntawm No. 5 PP tab sis lub hau ua los ntawm No. 1 PE; vim PE tsis tuaj yeem tiv taus qhov kub thiab txias, lub hau yuav tsum tsis txhob muab tso rau hauv lub microwave nrog rau lub thawv lub cev.
Tsis yog . 6 PS (Polystyrene)
Feem ntau pom nyob rau hauv cov noodle tais diav thiab ceev- cov thawv ntim khoom noj. Tsis txhob muab tso rau hauv lub microwave, vim qhov kub ntau dhau tuaj yeem ua rau cov tshuaj tso tawm. Nws decomposes tso tawm carcinogens thaum tuav cov kua qaub (xws li, kua txiv kab ntxwv) los yog alkaline tshuaj. Tsis txhob siv cov thawv no los ntim cov khoom noj kub. Tsis txhob noj instant noodle tais hauv lub microwave.
Tsis muaj . 7 PC (Lwm yam)
Feem ntau pom muaj nyob rau hauv lub raj mis dej, lub raj mis ua si, thiab lub raj mis me nyuam. Cov khw muag khoom feem ntau siv cov fwj dej ua los ntawm cov khoom siv no ua khoom plig tshaj tawm. Lawv yooj yim tso cov tshuaj lom Bisphenol A (BPA), uas ua rau tib neeg noj qab haus huv. Tsis txhob tso cua sov los yog muab tso rau hauv tshav ntuj ncaj qha thaum siv.