| Items | NG-1.0 | NG-0.9 | NG-0.8 | NG-0.7 | NG-0.6 |
| g/cm3 ≤ Bulk density | 1.0 | 0.9 | 0.8 | 0.7 | 0.6 |
| MPa ≥ Cold crushing strength | 3.5 | 3.0 | 2.5 | 1.0 | 0.8 |
| (W. /M.K) ≤ Thermal conductivity | 0.50 | 0.40 | 0.35 | 0.35 | 0.25 |
| 2% ºC Test temperature at which PLC not less than 2% | 1350 | 1300 | 1250 | 1250 | 1200 |