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| Product Name | A4 Copy Paper | | | | |||
| Weight | g/m² | 70g | 75g | 80g | |||
| | | 70±1 | 75±1 | 80±1 | |||
| Whiteness | % | 95-97 | | | |||
| Chroma | | L≥89 a 2.7-2.9 b -15.5±0.3 | | | |||
| CIE | | ≥147 | | | |||
| Thickness | um | 95±1 | 99±1 | 105±1 | |||
| Ash | % | 24-26 | 25-27 | 26-28 | |||
| Surface absorption weight | g/m² | 25-35 | 25-35 | 25-35 | |||
| Thickness banner check | % | ≤5 | ≤5 | ≤5 | |||
| Opacity | % | ≥93 | ≥93 | ≥93 | |||
| Longitudinal fracture length | km | ≥3.4 | ≥3.4 | ≥3.4 | |||
| Folding resistance times | 次 | ≥8 | ≥8 | ≥8 | |||
| Moisture | % | 5.0-5.5 | 5.0-5.5 | 5.0-5.5 | |||
| Expansion rate | % | ≤2.5 | ≤2.5 | ≤2.5 | |||
| Stiffness | mN.m | 0.30/0.12 | 0.33/0.13 | 0.40/0.14 | |||
| Smoothness | s | ≥18 | ≥18 | ≥18 | |||
| Smoothness difference on both sides | % | ≤25 | ≤25 | ≤25 | |||
| Dust degree | unit/m² | ≤0.5mm²≤280;0.5-1.5mm²≤20; | | | |||
| Grade | C(A/B Optional) | | | | |||








