| Grade | Compressive strength (Mpa) | Bending strength (Mpa) | ||||
| 1d | 3d | 28d | 1d | 3d | 28d | |
| 42.5 | 33.0 | 42.5 | 45.0 | 6.0 | 6.5 | 7.0 |
| 52.5 | 42.0 | 52.5 | 55.0 | 6.5 | 7.5 | 7.5 |
| 62.5 | 50.0 | 62.5 | 65.0 | 7.0 | 7.5 | 8.0 |
| 72.5 | 56.0 | 72.5 | 75.0 | 7.5 | 8.0 | 8.5 |
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Tangshan Polar Bear Building Materials Co., LtdUnverifiedYear 6
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| Grade | Compressive strength (Mpa) | Bending strength (Mpa) | ||||
| 1d | 3d | 28d | 1d | 3d | 28d | |
| 42.5 | 33.0 | 42.5 | 45.0 | 6.0 | 6.5 | 7.0 |
| 52.5 | 42.0 | 52.5 | 55.0 | 6.5 | 7.5 | 7.5 |
| 62.5 | 50.0 | 62.5 | 65.0 | 7.0 | 7.5 | 8.0 |
| 72.5 | 56.0 | 72.5 | 75.0 | 7.5 | 8.0 | 8.5 |
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