Epson 1010 User Manual page 198

Note: Envelope printing is only available at normal operating
conditions. Load the envelope with its long side horizontal.
Paper weight:
Paper thickness:
of
Number copies:
8-6 Technical Specifications
Envelope
Single Sheet
Continuous
Multi-part
forms
Envelope
Single Sheet
Continuous
Envelope
Label
(with
backing)
Up to 3 sheets including the original.
Total thickness must not exceed 0.01 inches
(0.25 mm).
14 lb to 24 lb
14 lb to 22 lb
12 lb to 15 lb per sheet.
Maximum number sheets = 3
12 lb to 24 lb
0.0025 to 0.0055 inches
(0.065 to 0.14 mm)
0.0025 to 0.0098 inches
(0.065 to 0.25 mm)
0.0063 to 0.0197 inches
(0.16 to 0.52 mm)
0.0075 inches
(Maximum 0.19 mm)