Standard heavy-duty corrugated boxes offer some moisture resistance but are not waterproof. When kraft paper absorbs moisture, box strength drops. For sea freight or humid storage, choose a treated box. Here are the five most common options.
1. Five Moisture-Proofing Options
| Treatment | How It Works |
|---|---|
| PE coating | PE film laminated on inner/outer surfaces – best protection |
| Desiccant packs | Absorb residual humidity inside the box |
| Waterproof tape | Seals seams and entry points |
| Water-resistant paper treatment | Water-repellent agent applied to the corrugated paper |
| Surface varnish | Water-resistant coating, also improves appearance |
2. Recommendations
1. Sea freight export – use a moisture-proof box or add a poly bag liner;
2. Coastal / humid warehouses – PE coating plus desiccants for double protection;
3. General domestic use – standard boxes are fine, keep them off damp floors.
GuardP offers PE coating and water-resistant treatments for heavy-duty corrugated boxes and honeycomb boxes. Contact us for a custom solution and a quote within 24 hours.