The corner of a package is the first thing to get hit. No matter how well you've packed the rest: if the edge hits the truck floor or another pallet, the damage goes to the product. A dented frame, a cracked screen, a piece of furniture with a chipped edge.
For that edge, there are two materials that are truly used: cardboard corner protectors (rigid, for pallets and boxes) and foam profiles (polyethylene foam, for delicate items). They don't do the same job. This guide tells you when to use each, what size makes sense, and how to place them.
What is the difference between a cardboard corner protector and a foam one?
Cardboard reinforces the corner and distributes the tension of the film; foam cushions the impact on a fragile item. If you put foam on the pallet or only cardboard on a thin frame, either the load will shift or the item will arrive marked.
| Cardboard (angle profile) | Foam (polyethylene foam) | |
|---|---|---|
| What it does | Provides rigidity and distributes pressure from film and stacking | Cushions impact on delicate edges and surfaces |
| Where it fits | Pallets, stacked boxes, furniture, appliances | Pictures, screens, profiles, items that cannot be scratched |
| With stretch film | Yes: film secures the corner protector and prevents it from cutting box edges | Does not replace cardboard on a pallet; foam compresses and does not structure the load |
| After shipment | Cardboard, to the blue bin | Can be reused if not crushed |
If you are palletizing or reinforcing boxes, we start with the 160 cm cardboard corner protector (4 cm wing). If what needs saving is the edge of a picture or a screen, the material is the 25x35 mm polyethylene foam profile (2 m bar). In many fragile product shipments, both are used: cardboard on the edges of the package or pallet, foam on the item itself.
When do pallet or box corners need protection?
Protection is needed when the edge is exposed to impacts, film, or the weight of what's on top; it's unnecessary in a small shipment that is already well-packed inside its box.
Almost always worth it
| Situation | Why |
|---|---|
| Pictures, mirrors, and prints | Frame corners are the most exposed and fragile point |
| Screens and monitors | An impact on the panel corner renders it unusable |
| Disassembled furniture | Boards splinter at the edges |
| Palletizing with film | Stretch film cuts the edges of boxes when tensioned; cardboard corner protectors protect and give structure to the pallet |
| Large appliances | Chassis dents at the corners |
| Doors and windows | Aluminum profiles and PVC frames deform with side impacts |
When they don't contribute
For small orders (cosmetics, clothing, accessories) or products already covered with bubble wrap and void fill material, corner protectors don't add value. Their domain is large, flat objects or those with exposed corners.
How are cardboard corner protectors used in palletizing?
They are placed on the four vertical edges, before tightening the film, so that the film doesn't cut the box cardboard and the load doesn't go out of square.
Many warehouses skip this step. When wrapping the pallet with stretch film, tension concentrates on the edges. If you tighten it, the film ends up cutting the cardboard. The boxes deform, the load shifts, and what's inside can arrive marked.
The cardboard corner protector does two things at once: it covers the edge and gives a bit of verticality to the pallet. To cover the height of the load, at TeleCajas we use the 160 cm angle corner protector; if the pallet is shorter, the excess is cut. If the load is irregular, horizontal sections can be added at the top and bottom, always under the film. If you palletize daily, there is also the palletizing guide.
What length and wing size of cardboard corner protector makes sense?
For a pallet, a long piece that covers the height of the load (in our case 160 cm, 4 cm wing); for a loose box or furniture, a shorter section cut from the same piece.
| What to look for | Common use | More demanding use |
|---|---|---|
| Length | A section covering the corner of the box or furniture | 160 cm vertically, to pallet height; cut if too long |
| Wing | About 4 cm covers the edge of boxes and most pallets | If the edge is very exposed, cardboard + foam on the item; no need for another wing reference |
| Material | Rigid cardboard for pallets and stacking | Foam on the item if impact or scratching also needs to be avoided |
No need for a catalog of ten lengths. With the 160 cm corner protector for pallets, you cover industrial use and cut for individual shipments. Foam is not chosen by pallet length, but by the item's edge: the 25x35 mm profile hugs the edge; the 2 m bar is cut to the size of the frame or screen.
How are corner protectors combined with film, bubble wrap, and foam?
Corner protectors go with the material that secures or covers: film on the pallet, bubble wrap on the surface, foam on the delicate edge. They rarely travel alone.
Pictures and screens: foam on the 4 corners of the item + bubble wrap on the entire surface + double-wall flat box. If the package is palletized, cardboard on the pallet edges, not instead of foam.
Palletizing: cardboard corner protectors on the 4 vertical edges + stretch film in a spiral. Irregular load: horizontal sections at the top and bottom, always under the film.
Furniture: cardboard on exposed corners + foam profile on lacquered edges or surfaces that scratch + film for immobilization.
If you want the complete map of materials, there is the packaging materials guide.
Frequently asked questions about cardboard and foam for corners
When to use cardboard corner protectors and when foam?
Use cardboard when the corner needs to withstand film, stacking, or the impact of one pallet against another. Use foam when the item itself (frame, screen, profile) cannot take the impact. On a pallet with fragile product, use both: cardboard outside, foam on the item's edge.
What are cardboard corner protectors for on a pallet?
They protect the edge of the boxes so the film doesn't cut it and give some vertical structure to the load. They don't replace a well-formed pallet or well-applied film; they prevent the most common failure at the four corners.
What size cardboard corner protector do I need?
For pallets, a 160 cm long piece with a 4 cm wing covers the usual height and is cut if the pallet is shorter. For a loose box or furniture, cut a section that covers the corner. Foam is measured to the edge of the item, not the height of the pallet.
How are corner protectors placed on a pallet?
On the four vertical corners, hugging the edge formed by the boxes, and then the film over them, which is what holds them in place. If the load is heavy or irregular, add horizontal sections at the top and bottom, always under the film.
Does foam replace cardboard corner protectors on a pallet?
No. Foam compresses and does not distribute the tension of the film. For pallets, the rigid profile is cardboard; foam goes on the item you want to protect from impact or scratching.
Can cardboard corner protectors be recycled?
Yes: they are cardboard and go into the blue bin. Polyethylene foam does not go into that bin; if it's still in good shape, reuse it for the next shipment. More context in the post on eco-friendly and sustainable packaging.
If you're palletizing, start with the 160 cm corner protector product page. If the problem is the edge of a picture or a screen, the 25x35 mm foam profile. For size or pallet questions: contact us.
