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Duplex Board with Grey Back/Duplex Board/Grey duplex board
1. Gsm from 180 to 400g.
| Item | Unit | Property |
| Gramm age <= | g/m2 | 230,250,300,350,400 ,450 ,500 |
| Gramme tolerance <= | % | ±5 |
| Width tolerance <= | % | ±5 |
| Tightness<= | g/m2 | 0.80 |
| Brightness ( coating side) ≥ | % | 82 |
| Roughness <= | m/s | 2.4 |
| Smoothness ≥ | s | 55 |
| Printing brightness ≥ | % | 55 |