High-density polyethylene (HDPE) makes excellent transit cases, especially when formed by the rotational molding process. HDPE is lightweight, strong, corrosion-proof, and resistant to solvents and acids. It remains stable through a wide temperature range. Rotational molding (roto-molding for short) distributes HDPE powder over the surfaces of a mold. The mold is heated and rotated. This allows liquid HDPE to create hollow shapes with complex geometries.
Other molding processes, like injection and blow molding, become increasingly expensive as the mold tools get bigger. In contrast, roto-molding is very cost-effective for shapes like transit cases. It offers flexibility so designers can produce cases that meet exact specifications.
Some of the advantages of rotationally molded transit cases are:
For transit cases, no other manufacturing process offers the advantages of rotational molding. It enables the production of large and complex shapes in low volumes. Designers have the flexibility to maximize strength and durability while minimizing weight and cost.