Raws li lub teb chaws tus qauv GB 8624-2012, "Kev faib tawm rau kev hlawv tus cwj pwm ntawm cov khoom siv hauv tsev thiab cov khoom lag luam," Class A cov ntaub ntawv tsis yog hluav taws kub thiab muaj cov hluav taws kub siab tshaj plaws, ua rau lawv tsim nyog rau cov cheeb tsam uas muaj kev ruaj ntseg hluav taws.
Raws li ib puag ncig tshwj xeeb xav tau kev huv huv thiab cov qauv kev nyab xeeb siab hluav taws kub, cov chav huv huv feem ntau xav tau kev siv Class A hluav taws- cov ntaub ntawv tiv thaiv kom muaj kev nyab xeeb. Cov ntaub ntawv A Class A tsis hlawv lossis tawm cov pa phem ntawm qhov kub thiab txias thiab tiv thaiv kev sib kis ntawm hluav taws.
Thaum xaiv hluav taws-cov ntaub ntawv tiv taus rau chav huv, lwm yam khoom siv- xws li corrosion kuj, tshuaj tsis kam, thiab siab -kub tsis kam- kuj yuav tsum tau txiav txim siab. Tsis tas li ntawd, cov ntsiab lus xws li kev teeb tsa thiab kev kho mob sib koom ua ke tuaj yeem cuam tshuam tag nrho cov hluav taws kub -kev ua haujlwm tsis kam.
Common Class A hluav taws- cov ntaub ntawv tiv taus muaj xws li cov pob zeb ntaub plaub, cov calcium silicate boards, thiab iav ntaub plaub. Cov ntaub ntawv no tsis yog tsuas yog cov hluav taws kub zoo xwb tab sis kuj zoo thermal thiab acoustic rwb thaiv tsev, ua rau lawv haum rau siv nyob rau hauv cov phab ntsa huv si, qab nthab, thiab lwm yam structural Cheebtsam.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov yuav tsum tau muaj kev nyab xeeb ntawm hluav taws yuav txawv ntawm cov kev lag luam sib txawv; yog li ntawd, nws raug nquahu kom xaiv cov hluav taws uas tsim nyog- cov ntaub ntawv tiv taus raws li cov qauv kev lag luam tshwj xeeb thiab cov qauv tsim tshwj xeeb.
