Note for site owner: the figures below are general industry reference ranges, not certified test results for your factory. Replace them with your own tested/certified values (and cite your actual testing standard, e.g. BIS/ISO/TAPPI) before publishing this as a formal spec sheet.
Board Grades & GSM
| Component | Typical GSM Range | Notes |
|---|
| Kraft liner (outer) | 120 – 250 GSM | Higher GSM = better print surface & puncture resistance |
| Test liner (recycled) | 100 – 200 GSM | Cost-effective alternative to virgin kraft |
| Fluting medium | 100 – 150 GSM | Determines flute stiffness and crush resistance |
Ply / Wall Construction
| Construction | Layers | Typical Use | Approx. Max Load |
|---|
| 3-Ply (Single Wall) | 2 liners + 1 flute | Standard shipping cartons, retail boxes | Up to ~15 kg |
| 5-Ply (Double Wall) | 3 liners + 2 flutes | Heavy/bulk items, export shipping | Up to ~40 kg |
| 7-Ply (Triple Wall) | 4 liners + 3 flutes | Industrial, pallet-level, machinery parts | 40 kg+ |
Strength Ratings
| Rating | What It Measures | Typical Range |
|---|
| Burst Strength (BS) | Pressure the board withstands before rupturing | 8 – 20+ kg/cm² |
| Edge Crush Test (ECT) | Stacking strength — how much weight the box can bear vertically | 20 – 44+ lb/in |
| Flat Crush Test (FCT) | Flute's resistance to crushing flat | Varies by flute type (A/B/C/E) |
Standard Size & Tolerance
| Parameter | Typical Range |
|---|
| Minimum box size | ~10 × 10 × 5 cm |
| Maximum box size (standard) | ~120 × 100 × 100 cm |
| Dimension tolerance | ± 3 – 5 mm (custom die-cut may vary) |
| Minimum order quantity | 100 boxes (standard sizes), higher for custom die-cut |