... ceiling board is a kind of envirionmental friendly, light weight, high quality, fire proof, water proof, anti-sinking, sound insulation ... , corrosion-resistant decorative ceiling board. It’s made of high quality paper-faced gypsum board with a layer of pvc ... solve sound insulation and fire proof.5).Not deforming, not cracking: keeping integrity and sound insulation for long under normal changes of.6 ...