Kev faib cov hnab ntim khoom

1. Raws li cov txheej txheem tsim khoom, lawv feem ntau muab faib rau hauv cov hnab ntim yas thiab cov hnab ntim khoom sib xyaw.
2. Muab faib los ntawm cov khoom siv raw: high-pressure polyethylene hnab yas, low-pressure polyethylene hnab yas, polypropylene hnab yas, polyvinyl chloride hnab yas, thiab lwm yam.
3. Muab faib los ntawm cov tsos: lub hnab tsho khuam, lub hnab ncaj, lub hnab ntim peb sab, lub hnab hauv qab square. Sealing hnab, daim kab xev, hnab tshwj xeeb zoo li tus, thiab lwm yam.