Side-by-Side Comparison
C-Series Envelopes (ISO 269)
C3 Envelope vs. C7/C6 Envelope
Comparing 2 standards across 10 specifications. 10 key differences identified.
Comparing:
C3 Envelope
C7/C6 Envelope
The C3 envelope is an ISO 269 standardized large postal packet format measuring 324 × 458 mm (12.76 × 18.03 inches). Designed specifically to hold flat, unfolded A3 documents (297 × 420 mm) or thick bound A4 portfolios, it is the standard packaging for architectural presentations, financial ledgers, and artwork shipments.
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
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Width × Height (Metric)
|
324 × 458 mm | 81 × 162 mm |
|
Width × Height (Imperial)
|
12.76 × 18.03 in | 3.19 × 6.38 in |
|
Target Paper Pairing
|
Unfolded A3 (297 × 420 mm) or bound A4 spiral/comb portfolios | A5 paper folded horizontally in thirds (70 × 148 mm) |
|
Primary Applications
|
Architectural drawings, financial balance sheets, graphic design proofs, diploma certificates | Confidential employee salary pay-slips, dividend warrant checks, gift certificates |
|
Geometric Mean Origin
|
Geometric mean of A3 (297×420 mm) and B3 (353×500 mm) | — |
|
Standard Paper Clearance
|
+27 mm width / +38 mm length allowance for easy insertion | — |
|
Common Closure Types
|
Peel-and-seal strip, string-and-button, cardboard gusset pocket | — |
|
Hybrid Geometry Origin
|
— | Height of C7 (81 mm) combined with Width of C6 (162 mm) |
|
Paper Insertion Clearance
|
— | +11 mm height / +14 mm width clearance |
|
Common Security Features
|
— | Dark opaque blue/black cross-hatch security pattern interior print |