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| Customization: | Available |
|---|---|
| Classification: | Duplex Board Grey Back |
| Usage: | Carton |
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| Item | Unit | Test | Grade AA | Grade A | ||
| Method | ||||||
| Basis Weight | G/M2 | ISO 536:1995 | 230-450 | 230-450±3% | ||
| Density | ≤300 G/M2 | G/M3 | ISO 534:1998 | 0.82 | 0.83 | |
| >300 G/M2 | 0.8 | 0.81 | ||||
| Brightness (face) | ≥ | % | ISO2470:1999 | 94 | 92 | |
| Smoothness | ≥ | s | ISO5627:1995 | 200 | 150 | |
| PPS Roughness | ≤ | μm | ISO8791-4:1992 | 1.8 | 2 | |
| Printing Gloss | ≥ | % | GB/T 12032 | 90 | 88 | |
| Oil Absorbance | % | GB/T 12911 | 15~28 | |||
| (K&N Value) | ||||||
| Resistance to picking | m/s | ISO 3783:1980 | 1.5 | 1.4 | ||
| ( Middle Viscosity) ≥ | ||||||
| Cobb | face ≤ | G/M2 | ISO 535:1991 | 50 | ||
| Water absorptiveness | back ≤ | 120 | ||||
| Stiffness | 230 G/M2 | mN·m | ISO2493:1992 | 2.5 | 2.3 | |
| CD | 250 G/M2 | 3.2 | 3 | |||
| ≥ | 300 G/M2 | 5.4 | 5.2 | |||
| 350 G/M2 | 7.9 | 7.6 | ||||
| 400 G/M2 | 11 | 10.6 | ||||
| 450 G/M2 | 15.2 | 14.5 | ||||
| Dust | 0.2~1.0mm2 | each/m2 | GB/T 1541 | 10 | 12 | |
| (Spot) | >1.0~2.0mm2 | 0 | 0 | |||
| ≤ | >2.0mm2 | 0 | 0 | |||
| Moisture | ≤300 G/M2 | % | ISO 287:1991 | 7.0±1.0 | ||
| >300 G/M2 | 7.5±1.0 | |||||
| *Test conditions: ISO 554 - 1976 (23 ± 1 °C / 50 ± 2 %) | ||||||
| *MD= Machine Direction CD= Cross Direction | ||||||


