Qhov ntsuas hluav taws kub ntawm polyurethane txias cia board tuaj yeem raug cais los ntawm qhov loj ntawm cov pa ntsuas pa (cov nqi tshwj xeeb yuav tsum tau kuaj los ntawm cov kws ntsuas ntsuas), xws li:
B1 qib polyurethane txias cia board: oxygen Performance index ntawm combustion test Ntau tshaj los yog sib npaug rau 32.
B2 qib polyurethane txias cia board: combustion test oxygen index Ntau tshaj los yog sib npaug rau 26.
Qib B3 polyurethane txias cia board: combustion test oxygen index <26.