... 3.Specification:max length 3660mm 4.Fireproof 5.waterproof Sinkwang fiber cement boards,100% free of asbestoes,the high temperature and ... the external wall, With high quality fiber and mineral substances as main content, cement fiber board was made with forming by advanced ... :4mm,5mm,6mm,8mm,9mm,10mm,12mm,15mm,18mm,20mm. fiber cement board exterior wall