*Fire-proof Rate: A- Class incombustible ( GB8624-1997)
*Incombustibility: 240 minutes (GB/T 9978-1999)
*Density: 1.2-1.5g/cm3
*Water content ratio: ≤30%
*Swelling ratioļ¼≤0.40%
*Anti-bending strength: ≥16Mpa
*Frost resistanceļ¼Do not appear cracking and delamination after 25 cycles of freezing and thawing (GB/T7019-1997)
*Radioactivity: standard of GB6566-2001 ( A-class Decoration Materials)