Hlau tiaj yog hais txog hlau 12-300 mm dav thiab 3-60 mm tuab nrog ntu plaub fab thiab ntug me ntsis. Cov tiaj tiaj tiaj tuaj yeem ua tiav cov hlau, kuj tseem tuaj yeem siv ua cov yeeb nkab txuas tsis tau thiab cov nplais nyias rau cov ntawv laminated. Lub thickness yog 8 ~ 50mm, dav yog 150-625mm, qhov ntev yog 5-15m, thiab cov khoom tshwj xeeb ncua yog tuab, uas tuaj yeem ua tau raws li qhov xav tau ntawm cov neeg siv. Hloov cov phaj nruab nrab, nws tuaj yeem txuas ncaj qha yam tsis txiav.