Steel and aluminum are the most common metals for distribution boxes. Steel is very strong and can take hard hits. You can move and put it. Heating and Conditioning: Paper rolls are fed into the corrugating machine, where they are heated and conditioned to optimal moisture levels Fluting: The medium (inner layer) is passed through heated fluting rolls that create the characteristic wave pattern Adhesive Application: Starch-based. What Is the Packaging Box and its Role? Last Updated on January 26, 2026, by Gentlever Team Understanding box materials is essential when designing custom packaging that protects, communicates, and performs. Each material type offers different strengths, appearances, and structural properties. Metal boxes also provide a degree of fire resistance, though the inner lining often includes flame-resistant coatings to prevent sparks from spreading. In this complete guide, we're diving deep into the world of box manufacturing and the top materials that bring your packaging to life. Think you can just grab any piece of kraft paper and make a corrugated box? Not quite—only grades with the right fiber length, tensile strength, and surface finish—often meeting ISO 536 and TAPPI T410.