Cov thev naus laus zis tshiab WPC pob zeb yas pem teb, ib yam tshiab ntawm cov pem teb uas nrov nyob hauv Europe thiab Amelikas tsis muaj dej, tiv taus hluav taws thiab hnav tau zoo heev. WPC ib puag ncig tus phooj ywg tsis muaj dej hauv pem teb, UV txheej txheej ntxiv, thiab UV pleev xim rau hauv pem teb yuav txhim kho hauv pem teb hnav tsis kam, tiv taus kub, stain tsis kam thiab lwm yam khoom; txheej txheej pob tshab, cuam tshuam ncaj qha rau cov txheej txheem tiv thaiv txheej txheej hauv pem teb yas lub neej kev ua haujlwm, siab coefficient Cov txheej tiv taus tuaj yeem txhim kho kev pab lub neej ntawm hauv pem teb;