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Corrugated has a fluted layer sandwiched between liners. Cardboard usually means solid paperboard with no flute.

The distinction is structural. Corrugated's fluting creates air columns that give it compression strength and cushioning, which is why shipping boxes use it. Paperboard, the material of a cereal box or a cosmetics carton, is a single solid sheet, thinner, smoother and better for printing, but with a fraction of the crush resistance. In everyday speech both get called cardboard, so when specifying, name the material precisely.

They describe the thickness and profile of the corrugated fluting, from thinnest to thickest.

E-flute is roughly 1.5mm and is the retail and e-commerce standard, giving a good print surface with adequate protection. B-flute at about 3mm steps up puncture and crush resistance. C-flute at about 4mm is the classic shipping carton grade. Double-wall combinations such as BC pair two flute layers for heavy or export use, roughly doubling edge crush resistance over single wall.

E-flute for light retail goods, B-flute for heavier or fragile items, and double wall for anything heavy, export-bound or stacked on pallets.

The property that matters is edge crush resistance, because most shipping damage comes from compression rather than impact. Boxes at the bottom of a stack carry the column above them for days. Specifying up out of caution has a real cost, though. Thicker board means a larger external box for the same contents, and dimensional weight pricing charges you for that on every parcel.

Dimensional weight is a shipping charge based on a parcel's volume rather than its actual mass, which means every unnecessary inch of box is paid for on every shipment.

Carriers multiply length, width and height, divide by a divisor, and charge on whichever is greater, that figure or the real weight. For light goods in oversized boxes, dimensional weight almost always wins. Right-sizing a box to its contents is the single most reliable packaging cost saving there is, and it usually pays back the redesign within weeks at any real volume.

Yes. Old corrugated containers are among the most successfully recycled materials in the waste stream, with recovery rates well above most packaging.

What breaks that is contamination and lamination. Grease-soaked board is rejected by paper mills because oil cannot be separated from fibre during repulping, and plastic-laminated board is a mixed-material item that many streams will not take. Keeping board unlaminated, using aqueous rather than plastic coatings, and using water-based inks all preserve recyclability.

Typically five to seven times before the fibres become too short to form strong paper.

Each repulping cycle shortens the cellulose fibres, which is why recycled board is slightly less stiff than virgin board at the same caliper. That matters when specifying, and the usual answer is to step up one caliper grade. Virgin fibre is added into the stream to maintain strength, which is why recycled content percentages rather than 100% recycled are the norm in structural grades.

500 units for most custom printed boxes, with 7–10 business days production.

The floor exists because a custom box needs a cutting die and a print setup, both fixed costs regardless of quantity. Digital printing and digital die-cutting have lowered the practical entry point for prototypes and very short runs, which is worth using to test a structure before committing to steel-rule tooling for production.

Custom, if you ship any real volume, because the freight saving from right-sizing usually covers the tooling cost quickly.

Stock sizes are cheaper per box and available immediately, which suits low volumes and mixed product ranges. But a stock box is by definition not sized to your product, which means void fill, more dimensional weight, and more movement in transit. At a few thousand units a year, a custom die that removes two inches of void typically pays for itself in freight alone.