Injection Molded vs Rotomolded Cases: Process Comparison (2026)
Manufacturing process comparison: injection molding (high pressure, fast cycle) vs rotational molding (low pressure, slow cycle, seamless). Cost, lead time, design flexibility, durability.
| Aspect | Injection Molding | Rotational Molding |
|---|---|---|
| Pressure | High (500-1500 bar) | Low (atmospheric) |
| Cycle Time | 30-90 sec | 20-60 min |
| Tooling Cost | $8,000-50,000 | $3,000-15,000 |
| Min Wall Thickness | 1.0 mm | 3.0 mm |
| Max Size | Limited by machine tonnage | Unlimited (e.g. 3m+ kayak hulls) |
| Wall Uniformity | Variable (thin in corners) | Excellent (uniform throughout) |
| Stress Points | Weld lines, knit lines | None (seamless) |
| Material Options | ABS, PP, PC, PA, POM, PBT | PE (LDPE, LLDPE, MDPE, HDPE), PP, PVC |
| Color | Masterbatch (any color) | Masterbatch (limited colors) |
| Surface Finish | Glossy, smooth, detailed | Slightly textured, less detailed |
| Insert Molding | Easy (metal inserts) | Difficult (secondary operation) |
| Best For | Cases under 1m, precision detail, large volume | Large cases, hollow parts, low volume |
| Examples | Pelican Storm, iM2450, most cases | Kayaks, coolers, large bins |
Verdict
Choose injection molding for: cases under 1m, precision features (latches, hinges), high-volume production, complex geometry. Choose rotational molding for: cases over 1m, hollow parts, low-volume prototyping, seamless stress-free construction. Most KeXinMaterials standard cases use injection molding for precision and speed.
Need help choosing?
KeXinMaterials offers custom OEM/ODM cases for every application. 12h quote response, 30-day delivery, MOQ 50-300pcs. Contact us today.