Xov Xwm Kev Lag Luam
-
Kev Piav Qhia Txog Cov Khoom Siv TPU
Xyoo 1958, Goodrich Chemical Company (tam sim no hloov npe hu ua Lubrizol) tau sau npe rau TPU hom Estane thawj zaug. Tau 40 xyoo dhau los, muaj ntau tshaj 20 lub npe lag luam thoob ntiaj teb, thiab txhua hom muaj ntau yam khoom. Tam sim no, cov chaw tsim khoom siv TPU feem ntau suav nrog...Nyeem ntxiv