Yog Waterproof Asphalt roj toxic

Waterproof asphalt coatings, extracted los ntawm petroleum, Yog comprised ntawm cov neeg tsis mloog hais, high-molecular hydrocarbons.

Tshwj xeeb tshaj yog thaum kub txias, Cov coatings emit noxious fumes los ntawm tej yam teeb meem nyob rau hauv cov asphalt, muaj ntau yam pauv loj rau hauv tsev huab cua zoo.