HP LaserJet Printer Family - Print Media Specification Guide
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... for a single-layer thickness. Envelopes must not scorch, melt, ignite, offset materials, or release undesirable emissions when heated to all HP LaserJet printers. Curl Envelopes must lie flat, with no more than 6 mm (0.25 inch) curl across the entire surface. See the support ... 28 lb). See the support documentation that came with your printer for specific information. The envelope flap must be stuck together from excess seam adhesive. For more than two thickness of paper anywhere along the leading edge. Envelopes should meet the specifications ...
... for a single-layer thickness. Envelopes must not scorch, melt, ignite, offset materials, or release undesirable emissions when heated to all HP LaserJet printers. Curl Envelopes must lie flat, with no more than 6 mm (0.25 inch) curl across the entire surface. See the support ... 28 lb). See the support documentation that came with your printer for specific information. The envelope flap must be stuck together from excess seam adhesive. For more than two thickness of paper anywhere along the leading edge. Envelopes should meet the specifications ...