| Item | Unit | Index | Standard |
| Density | kg/m3 | ≤95 | GB/T6343 |
| Water absorption ratio in vacuum | % | ≤10 | GB/T17794-2008 |
Dimension stability 105±3°C,7d | % | ≤10 | GB/T8811 |
| Crack resistance | N/cm | ≥2.5 | GB/T10808 |
Compression resilience ratio Compression time 72h | % | ≥70 | GB/T6669-2001 |
Anti-ozone Ozone pressure 202mpa 200h | Not cracking | GB/T7762 | |
Aging resistance 150h | Slightly crumpling, no cracks, | GB/T16259 |