Greyboard Thickness in Rigid Boxes: 1.5mm, 2mm, 2.5mm
The board is never seen. It decides whether the box feels solid or hollow.
Greyboard is the core of every rigid box. It is not seen, but it decides whether the box holds its edge, whether the lid fits, and whether the whole thing feels solid or hollow in the hand.
What greyboard is
Recycled paper fibre pressed into sheets, sold by thickness and by grammage. In rigid box production the common range runs from about 1.5 mm for small, light boxes up to 2.5 mm and beyond for large presentation boxes. It is dense, grey, and it does not print — it is always wrapped.
What thickness changes
Rigidity
Thicker board resists bowing. A wide lid in thin board will sag across its span under its own weight plus the wrap tension. This is why large boxes need thicker board even when the product is light — the load is the lid, not the contents.
Edge appearance
The wrapped edge is the most visible signature of a rigid box. Thicker board gives a wider, flatter edge face, which reads as more substantial. Very thin board produces an edge that looks like a folded carton, and the box loses the category signal.
Weight and freight
Board is a large share of total weight. Moving a full run from 2.5 mm to 2 mm saves weight on every unit shipped, and on collapsible constructions that saving compounds because the boxes ship flat.
Tolerance and fit
Board thickness is a tolerance, not an absolute. Two batches can differ slightly. On a tight lid clearance a small variation shows up as a lid that sticks. The drawing has to allow for it, which is a reason to state the board on the drawing rather than assume it.
How to choose
- Small jewellery or cosmetics boxes: thin board is enough and keeps the box refined rather than chunky.
- Standard gift boxes, hand-held: mid-range board is the default for a reason — it holds shape without excess weight.
- Large presentation boxes, corporate sets, spirit packs: thick board, because the lid span is the load case.
- Collapsible and export-heavy programmes: the lightest board that still holds the structure, because every gram ships.
The mistake that costs the most
Specifying thickness without specifying the wrap. The wrap paper has its own thickness and it adds to the finished edge. A drawing that fixes board at 2 mm and leaves wrap open will produce boxes that differ by a fraction of a millimetre at the edge — invisible in a photo, obvious in a stack.
The second most expensive mistake is changing board after the die is cut. Board thickness sets the die clearance. Changing it means a new die.
What to tell a supplier
If you have a reference box, send it — a caliper reading of its board settles the question faster than any description. If you do not, send the product dimensions and weight, the quantity, and how the box will be handled in transit. That is enough to propose a board, and it is the same information the quote needs anyway.
Leave a Reply