A PETG clear box is a folding problem presented as a packaging problem. The box has to be creased, folded, closed and shipped flat, and every one of those steps works against the stiffness that makes it look good on a shelf.
A cosmetics brand in Seoul packed gift sets in 0.8 mm clear boxes with tuck tabs. Packing line throughput dropped by a third because operators could not close the tabs consistently, and the tabs cracked after two openings in store.
PETG clear box gauge and crease design
- Box to 200 mm: 0.6 mm
- Larger or heavier: 0.8 to 1 mm
- Crease: 0.4 mm V-groove, both faces
- Tab: 12 mm tuck with a 3 mm lead-in chamfer
The crease is a controlled reduction in thickness. Too shallow and the box does not fold square; too deep and the crease line cracks on the first opening. A 0.4 mm V-groove on 0.8 mm sheet folds cleanly and survives a dozen cycles.
Corners, lids and print
Corners are either welded or bonded. Solvent bonding gives a clear joint with no visible line and is the standard for retail; ultrasonic welding is faster but leaves a whitened seam that reads as a defect on a clear box.
Lid closure design decides the customer experience. A friction lid with 2 mm interference holds firmly and can be hard to open; a tuck tab is easy but wears. Most brands settle on a tuck tab with a chamfered lead-in, which opens easily and still holds on a shelf.
Printing before creasing is the reliable route. Screen print on the flat blank, then crease and fold; printing after forming puts ink across the crease and it cracks on the first fold.
For the base sheet declarations, see PETG FDA compliance, and for the gauge and tolerance question on thin sheet, see PETG thickness tolerance.
Send your box dimensions, fold pattern and print artwork to oversales@rpplexiglass.com for a packaging quotation.
Frequently Asked Questions
What thickness PETG for a clear retail box?
0.6 mm for boxes up to 200 mm, 0.8 to 1 mm for larger or heavier contents. A 0.6 mm box that holds 500 g bows at the lid seam and reads as damaged goods.
How are PETG boxes closed?
A creased lid with a tuck tab, or a friction lid with a 2 mm interference. A tuck tab needs a crease that survives repeated opening; a friction lid needs the wall tolerance controlled or it is either loose or impossible to open.
Can PETG boxes be printed?
Yes, by screen print or UV digital onto the flat sheet before creasing. Printing after forming is unreliable on the crease lines, and a printed crease will crack the ink.