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Corrugated Cardboard Descriptions No. Cardboard Name Grammage Material type Bursting strength g/m2 kgf/cm2 1 A=B ≥140/90/90/90/110 AB/BC ≥7.80 2 A=B strengthen ≥200/120/90/120/140 AB/BC ≥11.50 3 B=B ...