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Q: Can I fold 4mm or 5mm PP sheet by hand?
Not easily. 3mm is the only thickness that folds cleanly by hand with a creasing wheel. 4mm can be folded along a scored line but requires more force and the fold line won’t be as crisp. 5mm requires industrial creasing or die-cutting equipment — you’re not folding it by hand.
Q: Which thickness is best for outdoor signs that need to last?
5mm with UV stabilization. It’ll hold up for 6–12 months in direct sun without significant fading or warping. For permanent outdoor installations (3+ years), specify UV-stabilized grade when ordering. 4mm works for moderate outdoor use but won’t last as long. 3mm is for short-term outdoor (2–4 weeks max).
Q: Is 4mm really strong enough to stand on its own?
Yes. A 400×600mm 4mm panel supports approximately 15 kg of evenly distributed load without visible deflection. For signs and displays, 4mm stays flat without any backing frame or support structure. That’s what makes it the sweet spot — rigid enough to self-support, light enough to keep costs down.
Q: What’s the weight difference between thicknesses?
3mm is roughly 400–600 g/m², 4mm is about 850 g/m², and 5mm ranges from 1,000–1,700 g/m² depending on density and color. In practical terms, a full pallet of 4mm sheets weighs about 30% less than the same pallet of 5mm sheets — which translates directly to lower freight costs.
Q: Are all three thicknesses food-contact safe?
Yes. All PPBOXY PP corrugated sheets in 3mm, 4mm, and 5mm are manufactured from food-grade polypropylene. They’re suitable for direct food contact in produce packaging, seafood boxes, and agricultural crates.
Q: Can PPBOXY manufacture custom thicknesses?
Yes. In addition to standard 3mm, 4mm, and 5mm sheets, PPBOXY can provide customized specifications based on your application, load requirements, and packaging design.
Q: How many times can I reuse PP corrugated sheets?
Depends on thickness and use intensity. 3mm: 30–50 cycles in packaging applications. 4mm: 50–100+ cycles. 5mm: 200+ cycles in heavy-duty reuse scenarios. All are 100% recyclable as PP Code 5 at end of life.