EPE Foam vs PU Foam
EPE (Expanded Polyethylene) foam and PU (Polyurethane) foam are the two most common foams for case interiors. EPE is closed-cell, moisture-resistant, and durable. PU is open-cell, softer, and better for delicate items. This guide compares them.
Feature-by-Feature Comparison
| Feature | Option A | Option B |
|---|---|---|
| Structure | Closed-cell (waterproof) | Open-cell (absorbs water) |
| Density | 20-50 kg/m³ | 15-40 kg/m³ |
| Density (our standard) | 30 kg/m³ (base) + 45 kg/m³ (top) | 25 kg/m³ (base) + 35 kg/m³ (top) |
| Compression set | Excellent (low permanent deformation) | Moderate (higher permanent set over time) |
| Water absorption | Near zero (closed-cell) | High (open-cell, can absorb 5-10x weight) |
| Chemical resistance | Excellent (oils, solvents, acids) | Poor (degraded by many chemicals) |
| Anti-static available | Yes (coating 10^6-10^9 Ω) | Yes (coating or inherent) |
| Cost (per m³) | $200-500 (EPE) | $150-400 (PU) |
| CNC cutting | Excellent (clean cuts) | Good (slight dust) |
| Best for | Cameras, drones, electronics, military, medical, OEM | Padded dividers, light protection, retail packaging |
| Common applications | Camera kits, drones, military electronics, medical kits, OEM products | Camera bag dividers, retail packaging, light industrial |
| Lifespan | 10+ years | 5-8 years |
Our Verdict
Choose EPE foam for: water resistance, durability, OEM products, long-term use, anti-static. Choose PU foam for: lighter weight, lower cost, retail packaging, padded dividers, light protection. For most B2B cases, EPE is preferred. We also offer XLPE and EVA for specific applications.
Frequently Asked Questions
Is EPE foam waterproof?
Yes. EPE foam is closed-cell, meaning it does not absorb water. The cells are sealed and watertight. Even if submerged, EPE foam maintains its shape and protective properties. PU foam (open-cell) absorbs water and can become waterlogged.
What is XLPE foam?
XLPE (Cross-Linked Polyethylene) foam is a higher-density variant of EPE. It has better chemical resistance, higher temperature tolerance (up to +120°C), and is used for medical, automotive, and high-end industrial applications. Cost is 30-50% higher than EPE.
Can PU foam be made water-resistant?
Yes, with hydrophobic coating. Treated PU foam has water resistance comparable to EPE. We offer PU foam with hydrophobic treatment for applications where PU is preferred (softer feel, easier customization). For wet environments, EPE is still preferred.
What foam is used in Pelican cases?
Pelican uses a custom EPE/PU blend. The base layer is high-density EPE (for shock absorption), and the top layer is softer PU (for grip and equipment protection). We offer similar dual-density foam for OEM/ODM clients.
Is anti-static foam necessary?
For sensitive electronics (PCBs, hard drives, ASICs, sensors), yes. Anti-static foam prevents ESD damage. We offer EPE and PU foam with anti-static coating (10^6 to 10^9 ohms). For military, medical, and OEM electronics, anti-static is standard.
What about EVA foam?
EVA (Ethylene-Vinyl Acetate) foam is between EPE and PU in properties. It has rubber-like feel, good shock absorption, and is commonly used in sports equipment, orthotics, and tool inserts. Density 30-100 kg/m³. We offer EVA for specific OEM applications.
Need a custom quote?
Contact KeXinMaterials for OEM/ODM case manufacturing. 12h quote, 30-day delivery.