The corner of a package is always the first thing to get hit. Every time. It doesn't matter how well you've packed the rest—if the corner hits the truck floor or another pallet, the damage goes straight to the product. A dented picture frame, a screen with a cracked corner, a piece of furniture with a chipped edge.
Cardboard corner protectors are the simplest and cheapest solution to this problem. They weigh almost nothing, can be installed in seconds, and absorb impact precisely where it's needed most. And yet, they're one of the most frequently overlooked packaging materials.
What are corner guards and how do they work?
A corner protector is an L-shaped profile, usually made of solid or corrugated cardboard, that fits into the corner of a product or pallet. Its function is twofold: to absorb direct impacts to the edge (the most vulnerable area) and to distribute pressure when boxes are stacked on top.
They come in different thicknesses and lengths. The most common ones measure between 35 and 100 cm long, with wings of 35 to 50 mm and a thickness of 3 to 5 mm. For most shipments and palletizing, the 3 mm ones are more than sufficient.
When do you need corner guards (and when don't you)
Not every shipment needs corner protectors. But there are situations where they are practically mandatory:
Always use corner guards
| Situation | Because |
|---|---|
| Paintings, mirrors and prints | The corners of the frame are the most exposed and fragile point |
| Screens and monitors | A blow to the corner of the LCD panel renders it unusable. |
| disassembled furniture | The boards and sides chip easily at the edges. |
| Palletized with film | The stretch film cuts the edges of the boxes when stretched — the corner protectors protect and give structure to the pallet |
| Large appliances | Washing machines, refrigerators, dishwashers — the chassis gets dented at the corners |
| Doors and windows | Aluminum profiles and PVC frames deform with lateral impacts |
No corner protector is needed
For small e-commerce shipments (cosmetics, clothing, accessories) or for products that are already well-protected inside their boxes with bubble wrap and packing material , corner protectors don't add value. They are best suited for large, flat objects or items with exposed corners.
Corner protectors on pallets: more important than they seem
This is something many warehouses overlook. When you wrap a pallet with stretch film , the tension of the film concentrates on the edges of the boxes. Over time—or if you tighten it too much—the film literally cuts through the cardboard at the corners. The boxes become deformed, the load becomes unstable, and the product inside can be damaged.
Corner protectors solve this in two ways: they protect the edges from film cuts and provide structural rigidity to the pallet. A pallet with corner protectors on all four vertical corners can withstand significantly more weight and travels more stably. If you palletize regularly, it's worth reading our palletizing guide .
How to choose the right corner protector
| Feature | Standard option | Reinforced option |
|---|---|---|
| Thickness | 3 mm — standard shipping | 5 mm — heavy loads, stacked pallets |
| To the | 35 mm — standard protection | 50 mm — furniture, appliances |
| Long | 35-50 cm — individual boxes | 80-100 cm — pallets and large objects |
| Material | Compact cardboard — lightweight, economical | Corrugated cardboard — greater cushioning |
For most uses (shipping paintings, protecting pallets, furniture), the standard 3mm thick and 35mm wide corner protectors are perfect. You only need the reinforced option if you're stacking pallets weighing over 500 kg or transporting heavy industrial parts.
How to combine corner guards with other materials
Corner protectors are rarely used alone. They are usually combined depending on the situation:
For paintings and screens: Corner protectors on all 4 corners + bubble wrap covering the entire surface + reinforced double-channel flat box .
For palletizing: Vertical corner protectors on all 4 edges of the pallet + stretch film wrapped in a spiral. If the load is irregular, add horizontal corner protectors at the top and bottom.
For furniture: Corner protectors on exposed corners + foam sheets on delicate surfaces + stretch film to secure everything.
If you want a complete overview of all available protective materials, check out our comprehensive guide to packaging materials .
Frequently asked questions about cardboard corner protectors
What are cardboard corner protectors used for?
Cardboard corner protectors safeguard the corners and edges of products during transport and storage. They are primarily used for paintings, screens, furniture, appliances, and industrial palletizing. They absorb direct impacts to the most vulnerable area of the product and, on pallets, prevent stretch film from cutting the edges of the boxes. Available at TeleCajas with 24-hour delivery.
What size corner protector do I need?
For individual shipments (paintings, screens, furniture), corner protectors 35-50 cm long with a 35 mm flange and 3 mm thickness are the most common. To protect entire pallets, you need long corner protectors (80-100 cm) that cover the full height of the pallet. The 50 mm flange is used for heavy loads or industrial parts.
How do you attach corner protectors to a pallet?
Corner protectors are placed at the four vertical corners of the pallet before wrapping with stretch film. The corner protector should hug the edge formed by the stacked boxes. The film is then passed over it, securing the corner protectors in place. For heavy loads, horizontal corner protectors are added to the top and bottom of the pallet.
Are cardboard corner protectors recyclable?
Yes, they are 100% cardboard and can be recycled in the blue bin. It's one of the most sustainable protection options—no plastic, no foam, just recycled and recyclable cardboard.
Where can I buy cardboard corner protectors in Spain?
TeleCajas offers cardboard corner protectors in various sizes, with 24-48 hour delivery throughout Spain and Portugal. No minimum order required; prices include VAT. For large orders or custom sizes, they offer personalized B2B quotes through their contact page .
Can I use plastic corner protectors instead of cardboard?
Yes, polyethylene or polypropylene corner protectors are available, which are more durable and reusable. They are used in industrial logistics where corner protectors are recovered and reused many times. For single-use shipments or companies seeking sustainable packaging, cardboard corner protectors are the most practical and eco-friendly option. Learn more in our post on eco-friendly and sustainable packaging .
