... sizes:915mm*2135mm 600mm*800mm thickness:25~50mm Perlite insulation boardPerlite board characteristics:1. Natural, enviromental-protection oriented, ... damp-proof, anti-corrosion3. Light, good insulation for head & sound, good heat preservation performance.4. Available to cut saw, ... used in pubic places with high fireproof & sound Insulation demands, such as office building, commercial shopping center, ...