A PETG clamshell packaging decision usually starts with a product photo and ends with a hinge test. The panel has to show the product without distorting it, and the hinge has to survive being opened in a shop a hundred times.
A tool brand in Sheffield moved its 12-piece socket sets into 0.8 mm PETG clamshells. The first run failed at the hinge after a week of shelf handling; the fix was a 2.5 mm hinge radius formed at the correct temperature, not a thicker sheet.
PETG clamshell packaging gauge and closure
- Light goods: 0.5 mm, snap closure
- Medium packs: 0.6 to 0.8 mm, button or snap
- Hinge radius: 2 to 2.5 mm, formed hot
- Edge: curled 1.5 mm, never raw cut
Gauge follows product weight and shelf handling. A 0.5 mm clamshell carrying 200 g is fine; the same gauge around a 600 g tool set oil-cans and the product looks warped through the plastic.
Hinges, edges and the PVC comparison
The hinge is a formed radius, and the forming temperature decides its life. Cold folding creates a stress line that opens into a crack after a few dozen cycles, and the customer sees it as a pack that will not stay shut.
The edge should be curled or rolled. A raw die-cut edge on 0.6 mm PETG is sharp enough to cut a finger and it also reads as cheap. A 1.5 mm curl costs one tool station and removes both problems.
Against PVC, PETG wins on clarity and on ageing: no plasticiser means no embrittlement, so a pack that sits in a warehouse for a year still opens cleanly. PVC remains cheaper in some regions, and the choice is usually made on landed cost plus the retailer recyclability label.
For food-contact packs, the grade question is covered in PETG FDA compliance; for the forming parameters that keep a hinge alive, see PETG thermoforming.
Send your product dimensions, closure type and annual volume to oversales@rpplexiglass.com for a clamshell quote.
Frequently Asked Questions
What thickness PETG for clamshell packaging?
0.5 mm for light consumer goods, 0.8 mm for products over 300 g or where the pack is handled roughly on a shelf. Below 0.4 mm the hinge fatigues within a few openings.
Why do clamshells crack at the hinge?
Hinge radius too tight and fold line cold worked. A 2 mm hinge radius formed hot holds; a sharp fold formed cold cracks after 20 to 30 cycles, which is exactly the number of times a shop pack is opened and closed.
Is PETG better than PVC for clamshells?
For clarity and recyclability positioning, yes. PETG is clearer and does not need plasticiser, so it does not embrittle with age. PVC still wins on cost in some markets and on heat resistance in others.