Item UnitDataSubstance gsm70-80±2Thickness MM≥95-110Thickness Difference MM≤0.02Opacity % ≥95Whiteness % CIE167COBB 60 S gsm230+/-100MLAsh % 9-15 Key performance : No jam in phototcopy machine Nice touch-smooth and bulky No see trough-print both sides Been developed for:phototcopy machines,laser printers,fax machines