1. Kov: Seb puas yog qhov kev ntxig sib txawv thiab cov ntawv me me yog qhov zoo sib xws. Qhov zoo ntawm lub raj tsis daws cov teeb meem. Yog tias koj kov nws, cov coarse co feem ntau yuav sib xyaw nrog lwm cov impurities.
2. Kev hlawv roj: Nws yog qhov qhia tau thiab pab tau thaum nws taws. Cov iav fiber ntau cov dej sib xyaw nrog cov ntawv thim rov qab thiab lwm cov khoom tsis huv hauv cov khoom nyoos yuav tawm cov pa luam yeeb dub thiab muaj ntxhiab tsw; tom qab cov khoom siv zoo tau hlawv, nws yuav tsis tawm cov pa luam yeeb dub thiab tsw ntxhiab, thiab cov kua dej molten tseem huv heev tom qab hlawv.
3. Tsw tsw: tsw lossis tsw. Cov kav dej zoo tsis muaj ntxhiab, thiab cov pluag tsis muaj cov ntxhiab coj txawv txawv. Nws yog yuav hais tias lawv tau tov nrog polyethylene (piv txwv li, PE) es tsis txhob polypropylene.
4. Kev Tsoo Tawm: Cov raj zoo fiberglass muaj qhov zoo" kev tiv taus" ;. Nws yooj yim heev rau luag vim tias muaj ntau cov calcium calciumate fillers, uas yog ib txwm tsis yog cov zoo fiberglass raj. Lub iav fiber raj uas tsis tuaj yeem tawg tsis tas yuav yog lub raj zoo. Qhov tseem ceeb yog saib cov khoom siv nyoos thiab kev siv tshuab.
5. Taus Tawv: Lub iav fiber raj muaj qhov nyuaj heev, thiab nws tuaj yeem raug nias rau hauv lub raj deformed ntawm yuav. Nws yog twv yuav raug hu tsis yog PPR lub raj.
