... hot strength . The density of board is from 250kg/M3 to 400kg/M3 NBY series ceramice fiber board is made from full ... BY ceramic fiber in a automatic wet vacuue forming process.Products ... , fire safety, noise, insulationDensity:250,280,300,320 ,350,400KG/M3 Size:Length*Width(mm*mm):1200*1000, 1000*600,900 ...