HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 250

General Guidelines Refer to Purchasing in the next section for ordering HP transparencies. Table D-6 Overhead transparency specifications summary Basis Weight 45 to 60 pound (170 to 225 g/m2) Cutting Angle 90°plus or minus 0.2° Finishing Plus or minus 0.03 in. (plus or minus 0.8 mm) Fusing Compatibility All materials of the overhead transparency must be compatible with the heat and pressure of the fusing process. Materials must not discolor, melt, offset material, or release hazardous emissions when heated to 392°F (200°C). Recycled Paper Recycled paper is a combination of waste paper, pre-consumer waste, and post-consumer waste. Printed waste paper is usually washed to remove most of the inks and other contaminants. A recycled sheet of paper may contain dark specks or appear gray or dirty. You should choose a recycled paper that meets the same specifications (except perhaps brightness) as standard paper, and has an appearance suitable for your needs. Hewlett-Packard recommends that the recycled paper contain no more than 5% groundwood. Note Depending on the quality of recycled paper, you may experience a higher jam rate and reduced consumable life compared to equivalent quality non-recycled paper. Archival Paper Paper used for archiving must meet the same specifications as standard paper, however, the pH should be no less than 7.0. Some archival demands are more stringent than others, requiring the degree of alkalinity and chemical stability to be specified. Toner is chemically stable and should last as long as the paper does. Toner can be degraded by petroleum based solvents or plasticizers, such as those found in vinyl folders. Avoid folding archival documents across printed areas or handling them roughly. Discuss archival requirements with your paper supplier. Colored Paper Colored paper can be used in D640 printers as long as the standard paper specifications are met. D-14 Using Paper