*Tsawg thiab nruab nrab siab polyethylene: feem ntau yog txhaj cov khoom lag luam thiab cov khoom hollow.
*Ultra-high-pressure polyethylene: Vim yog cov cuab yeej zoo tshaj plaws ntawm ultra-high-molecular-hnyav polyethylene, nws tuaj yeem siv ua cov yas yas.













