Xerox 4215 Operator's Manual page 320

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G-12 Paper Facts
The adhesives used in envelopes should not
scorch, melt, offset, or release hazardous
emissions when heated to 392° F (200° C) for
0.1 second.
NOTE: The basis weight of the envelope paper
should not exceed 24 pounds (90 gsm) or jamming
may result. Envelopes should lie flat with