HP LaserJet 4345 Multifunction Printer series - Manual (Page 275)

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Media specifications
Print media specifications
For complete paper specifications for all HP LaserJet printers and MFPs, see the
HP LaserJet Printer Family Print Media Guide (available at
http://www.hp.com/support/
ljpaperguide ).
Category Specifications
Acid content 5.5 pH to 8.0 pH
Caliper 0.094 to 0.18 mm (3.0 to 7.0 mils)
Curl in ream Flat within 5 mm (0.02 inch)
Cut edge conditions Cut with sharp blades that create no visible fray.
Fusing compatibility Must not scorch, melt, offset, or release
hazardous emissions when heated to 200°C
(392°F) for 0.1 second.
Grain Long grain
Moisture content 3% to 9% by weight
Smoothness 100 to 250 Sheffield
Printing and paper storage environment
Ideally, the printing and paper storage environment should be at or near room temperature,
and not too dry or too humid. Remember paper is hygroscopic; it absorbs and loses moisture
rapidly.
Heat works with humidity to damage paper. Heat causes the moisture in paper to evaporate,
while cold causes it to condense on the sheets. Heating systems and air conditioners
remove most of the humidity from a room. As paper is opened and used, it loses moisture,
causing streaks and smudging. Humid weather or water coolers can cause the humidity to
increase in a room. As paper is opened and used it absorbs any excess moisture, causing
light print and dropouts. Also, as paper loses and gains moisture it can distort. This can
cause jams.
As a result, paper storage and handling are as important as the paper-making process itself.
Paper storage environmental conditions directly affect the feed operation.
ENWW Print media specifications 261