Walls are often stiffened with rib bulges, especially on larger cans, to help the can resist dents that can cause seams to split. The outward-bent portion of the tube, including its edge, is still slightly further out. Steel cans are stronger than cartons or plastic, and less fragile than glass, protecting the product in transit and preventing leakage or spillage, while also reducing the need for secondary packaging. Steel is a permanent material a steel can can be recycled again and again without loss of quality. Cans hold diverse contents: food, beverages, oil, chemicals, etc.
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