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– Technical specification tables 51
Envelopes
The table below summarizes the envelope specifications that provide
the best performance.
Note The specifications listed in this section generally apply to all HP
LaserJet printers but check the user documentation that came with your
printer for product specific information.
Property Specifications
Basis weight 64 gsm to 105 gsm (17 lb to 28 lb) typical.
See the user documentation that came with your printer for
specific printer and input limits.
Caliper 0.09 mm to 0.14 mm (3.6 mil to 5.5 mil) typical single-layer
thickness.
Surface roughness 100 to 200 Sheffield.
Fusing compatibility All inks, adhesives, and other materials used in the envelope
construction must be compatible with the heat and pressure of
the fusing process. Materials must not scorch, melt, ignite, offset
materials, or release undesirable emissions when heated to
205° C (401° F) for 0.1 second (0.2 second for HP Color
LaserJet printers).
Dimensional accuracy and
construction quality
Envelopes must be folded within ±1.01 mm (±0.04 in) of nominal
size with no more than two thickness of paper anywhere along
the leading edge;
all folds must be sharply creased and construction must be tight
(not baggy) to avoid wrinkling;
envelopes must not be stuck together from excess seam
adhesive (blocking);
flap must be flat within 1.5 mm (0.059 in) over the width where
adhesive is applied.
Curl Envelopes must lie flat, with no more than 6 mm (0.25 in) curl
across the entire surface.
Adhesive flap curl Envelope flap should be flat, with 1.5 mm (0.059 in) over width
where adhesive is applied.
Moisture content 4% to 6% by weight.
Grain Different envelope constructions might require different grain
orientations for best performance, which is left to the discretion
of the converter.
Packaging Protective box to prevent edge damage and maintain flatness.