HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 246

General Guidelines Note It is possible that paper could meet all of the general specifications listed in this table and still not print satisfactorily because of the printing environment or other variables over which Hewlett-Packard has no control. Recommended Paper Specification Summary Table D-4 Recommended paper specifications Parameter Paper Weight Paper Grade Paper Direction Furnish Ash Content Moisture Content Smoothness Friction Coefficient Surface Resistivity Caliper Finishing Cut Edge Conditions Packaging Specification 17 to 24 pound (64 to 90 g/m2) for printer and HCI; printer supports up to 36 pound (135 g/m2) No. 1 or No. 4 electrophotographic Long grain (parallel to the long dimension) Short grain (ideal for letter/A4 size paper) Fiber composition: 100% chemical wool pulp and /or cotton fiber Not to exceed 10% 4.7 ± 1% by weight 100 to 200 Sheffield units Front side: 30 ± 12 Sec Back side: 23 ± 10 Sec 0.45 to 0.65 0.55 to 0.15 (dynamic) 0.60 ± 0.15 static 1010 to 1012 Ohms 97± 3 Ȑm Cut sheet to within ±0.03 in (±0.8mm) of nominal, ±0.2° square Rotary precision cut Polylaminated moisture-proof ream wrap D-10 Using Paper