Particle baord(chipboard), made of pine or hard wood, E2 standard MEET GB/T 4897-92 STANDARD,AND E2 STANDARD, inner structure intensity ≥0.35 Mpa swell rate)< 10% moisture: 5~11 density : 600~750㎏/m3 formaldehyde emission≤30mg/100g exterior structure intensity ≥0.95 Mpa Normal size:1220*2440*6.5~18mm