HP LaserJet Printers - Print Media Guide

Envelopes that are not square, straight, or constructed correctly. (See Envelope construction on page 14.)
Envelopes of a basis weight less than 60 g/m
2
(16 lb) or greater than 105 g/m
2
(28 lb).
Envelopes that have baggy construction or folds that are not sharply creased.
ENWW Types of print media to avoid 27