Technical Reference Guide – Appendix D – Media specifications > 245
> Cut sheets with corner folds more than 2 mm high, as 
shown below, are usable.
Bends, curls
> Cut sheets curled in an arc are usable, when the amount 
of curling is within 2 mm (see below).
> Cut sheets with bends of more than 2 mm high within less 
than 15 mm of any bend point (see below) cannot be 
used.
E
NVELOPES
 (
INDIVIDUAL
)
> Weight:
24 lb. max.
> Thickness:
0.39 mm (0.015 in max.)
> Dimensions:
Paper folded completely across Corner fold
its width is unusable.
Corrected to 
2 mm or less
15 mm or above
     Curled paper
2 mm or less
Arc
15 mm or more
Corrected to 
2 mm or less
Bent paper