Side-by-Side Comparison
C-Series Envelopes (ISO 269)
C5 Envelope vs. C6 Envelope
Comparing 2 standards across 8 specifications. 8 key differences identified.
Comparing:
C5 Envelope
C6 Envelope
The C5 envelope is an ISO 269 standard postal envelope measuring 162 × 229 mm (6.38 × 9.02 inches). Designed to enclose an A4 sheet folded once in half (V-fold) or an unfolded flat A5 document (148 × 210 mm), it is standard for greeting cards, invitations, company invoices, and small paperback book shipments.
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.
Specification Comparison Table
8 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
162 × 229 mm | 114 × 162 mm |
|
Width × Height (Imperial)
|
6.38 × 9.02 in | 4.49 × 6.38 in |
|
Geometric Mean Origin
|
Geometric mean of A5 (148×210 mm) and B5 (176×250 mm) | Geometric mean of A6 (105×148 mm) and B6 (125×176 mm) |
|
Target Paper Pairing
|
A4 folded in half (148 × 210 mm) or flat unfolded A5 stationery | A4 folded into quarters (105 × 148 mm) or flat unfolded A6 cards/postcards |
|
Paper Insertion Clearance
|
+14 mm width / +19 mm height clearance | +9 mm width / +14 mm height clearance |
|
Primary Applications
|
Greeting cards, event invitations, invoices, corporate brochures | Personal handwritten letters, greeting cards, holiday cards, RSVP response cards |
|
Window Options
|
Standard left-hand or right-hand clear address window (45 × 90 mm) | — |
|
Weight of Empty Envelope
|
— | ~4.0 to 5.5 grams |