Side-by-Side Comparison
C-Series Envelopes (ISO 269)
C6 Envelope vs. C7/C6 Envelope
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
C6 Envelope
C7/C6 Envelope
The C6 envelope is an ISO 269 standard compact postal envelope measuring 114 × 162 mm (4.49 × 6.38 inches). Designed to enclose an A4 sheet folded in half twice (cross-folded in quarters) or an unfolded A6 picture postcard (105 × 148 mm), it is the global standard for personal correspondence, holiday cards, and gift certificates.
The C7/C6 envelope is an ISO 269 hybrid envelope format measuring 81 × 162 mm (3.19 × 6.38 inches). Having the height of a C7 envelope and the width of a C6 envelope, it is engineered specifically to hold an A5 sheet folded in thirds, widely used for confidential payroll slips, dividend checks, and gift vouchers.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
114 × 162 mm | 81 × 162 mm |
|
Width × Height (Imperial)
|
4.49 × 6.38 in | 3.19 × 6.38 in |
|
Target Paper Pairing
|
A4 folded into quarters (105 × 148 mm) or flat unfolded A6 cards/postcards | A5 paper folded horizontally in thirds (70 × 148 mm) |
|
Paper Insertion Clearance
|
+9 mm width / +14 mm height clearance | +11 mm height / +14 mm width clearance |
|
Primary Applications
|
Personal handwritten letters, greeting cards, holiday cards, RSVP response cards | Confidential employee salary pay-slips, dividend warrant checks, gift certificates |
|
Geometric Mean Origin
|
Geometric mean of A6 (105×148 mm) and B6 (125×176 mm) | — |
|
Weight of Empty Envelope
|
~4.0 to 5.5 grams | — |
|
Hybrid Geometry Origin
|
— | Height of C7 (81 mm) combined with Width of C6 (162 mm) |
|
Common Security Features
|
— | Dark opaque blue/black cross-hatch security pattern interior print |