| Grades | HCR 1940 U | HCR 1950 U | HCR 1960 U | HCR 1970 U |
| Appearance of MB | transluent | transluent | transluent | transluent |
| MI | 60 | 37 | 53 | 90 |
| MF | 34 | 37 | 53 | 90 |
| ML 1+4 | 28 | 30 | 44 | 73 |
| Rheometry condition: 170oC*12min | | | | |
| MH | 8.5 | 10.3 | 42 | 18.09 |
| Ts2 (s) | 42 | 49 | 67 | 43 |
| Tc90 (s) | 132 | 149 | 148 | 134 |
| 硫化条件5min. 175°C with 1.1%双二五(45%), no PC | | | | |
| Specific gravity | 1.11 | 1.15 | 1.18 | 1.22 |
| Hardness (Shore A) | 41 | 49 | 62 | 70 |
| Tensile Strength (MPa) | 9.4 | 9.8 | 9.3 | 8.5 |
| Elongation at break (%) | 594 | 482 | 406 | 392 |
| Modulus 100% (MPa) | 0.83 | 1.34 | 2.09 | 2.76 |
| Tear strength (kN/m) D624 B | 17 | 17 | 17 | 19 |
| Resilience (%) | 63 | 56 | 48 | 41 |
| Compression set( 22h/177°C) | 26.5 | 24.37 | 24.13 | 28.56 |
| Linear Shrinkage (%) | 3.60 | 3.20 | 3.21 | 3.34 |
| Performance on 2-rolling mill | normal | Normal | Normal | normal |
| Stick to the two roll mill | +++ | +++ | +++ | +++ |
| Stick to the mould | +++ | +++ | +++ | +++ |
| process ability + means worse, +++ means excellent | | | |
