User`s guide

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Table E-4
Envelope Specifications
Envelope Properties Specifications
Paper Envelope construction must meet all of the specifications listed in
Table E-3.
Composition 100% chemical wood pulp and/or cotton fiber
Basis Weight
(single layer)
20 to 24 pound (75 to 90 g/m
²
)
Caliper 3.3 to 5.5 mils (0.084 to 0.14 mm) single layer thickness
Electrical Properties Surface resistivity: 2.0 to 15 x 10
10
ohm/sq.
Volume resistance: 1.2 to 15 x 10
11
ohm x cm
(conditioned at 23° C and 50% relative humidity)
Fusing Compatibility All inks, adhesives, and other materials of the envelope 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) for
0.1 second.
Finishing Envelopes must not have exposed adhesive. Each envelope must
be accurately folded (+/- 0.04 inch) so there are no more than two
thicknesses of paper along the leading edge. Folds must be sharply
creased and construction must be tight (not baggy).
Curl Envelopes must lie flat with no more than 0.25 inch (6 mm) curl
across the entire surface.
Moisture Content 4% to 6% by weight
Smoothness 80 to 180 Sheffield
Paper Facts E-11