Specification: 1) Standard Thickness: 6.5-20mm 2) Standard Dimensions: 595x595mm, 603x603mm, 300x300mm, 600x600mm, 600x1200, 595x1195mm, etc 3) Density:280-430kgs/m3 4)Edge: Square edge, Tegular edge, Concealed edge. Features: 1) Fire Performance: Meets GB8624-1997B1 Standards 2) Asbestos Free 3) Formaldehyde Free 4) Product Content: Mineral Fiber 5) Color of Surface: White 6) Noise Reduction Coefficient: Nrc 0.4 - 0.6 Depending On The Pattern And The Thickness 7) Light Reflectivity: More Than 85% Quality Certificate: ISO9001:2000, CE Certificate