Aluminum vs Plastic Case
Aluminum and plastic cases are both used for protective cases, but they serve different needs. Aluminum is heavier, more expensive, and provides natural EMI/RFI shielding. Plastic is lighter, cheaper, and easier to customize. This guide helps you choose the right material for your application.
Feature-by-Feature Comparison
| Feature | Option A | Option B |
|---|---|---|
| Density | 2.7 g/cm³ (heaviest) | 0.9-1.2 g/cm³ (lightest) |
| Tensile strength | 200-570 MPa (depends on alloy) | 30-70 MPa |
| Impact resistance | Dents, doesn't crack | Cracks on extreme impact |
| Weight (530x400x250 case) | 3.5-4.5 kg | 1.8-2.4 kg |
| Cost (530x400x250 case) | $150-300 | $30-80 |
| EMI/RFI shielding | Natural (60+ dB attenuation) | Requires conductive coating |
| Corrosion resistance | Anodized = excellent; bare = poor | Excellent |
| Temperature range | -270°C to +600°C | -40°C to +120°C |
| Customization | CNC machining, welding, anodizing | Molding, color matching, foam |
| Recyclability | 100% recyclable, high scrap value | 100% recyclable, low scrap value |
| Best for | Military, aerospace, EMI-sensitive, fire-resistant, premium, lifetime durability | B2B, custom foam, lightweight, color-coded, retail |
| Common applications | Mil-spec transport, RF-shielded electronics, aerospace, fire-resistant, lifetime tool cases | Camera cases, drone cases, medical kits, retail packaging, OEM cases |
Our Verdict
Choose aluminum for: EMI/RFI shielding, fire resistance, extreme temperatures, lifetime durability, premium positioning, military/aerospace. Choose plastic for: lightweight, lower cost, custom foam, color matching, B2B standard applications. Hybrid: aluminum frame with plastic panels for the best of both.
Frequently Asked Questions
Is an aluminum case worth the extra cost?
For applications requiring EMI/RFI shielding, fire resistance, or extreme durability, yes. For standard B2B protective cases, plastic is 80% cheaper and 50% lighter. The cost premium for aluminum is typically 2-4x.
Is aluminum lighter or heavier than plastic?
Aluminum is 2-3x heavier than plastic (2.7 vs 0.9-1.2 g/cm³). For a 530x400x250 case: aluminum 3.5-4.5kg, plastic 1.8-2.4kg. For weight-sensitive applications (drone, aerospace, military man-portable), plastic is preferred.
Does aluminum provide EMI/RFI shielding?
Yes, aluminum naturally blocks EMI/RFI with 60-80 dB attenuation across 14 kHz to 18 GHz (depending on wall thickness and gasket quality). For higher attenuation (80+ dB), use aluminum with copper or tin plating. Plastic requires conductive coatings (more expensive).
Is aluminum fireproof?
Aluminum is non-combustible (melting point 660°C). It will not burn or release toxic fumes. Plastic cases melt at 100-200°C and release toxic fumes. For fire-sensitive applications (aircraft, military, electronic transport), aluminum is required.
Can aluminum cases have custom foam like plastic?
Yes, but the foam is attached with adhesive or mechanical fasteners (no molded-in features). We supply aluminum cases with custom PE or PU foam. Foam options: closed-cell PE, anti-static PE, conductive PU, flame-retardant foam.
How long do aluminum cases last?
With proper care, aluminum cases last 20-30+ years. Plastic cases typically last 5-10 years. Aluminum is recyclable indefinitely. Plastic can be recycled but loses mechanical properties with each cycle.
Need a custom quote?
Contact KeXinMaterials for OEM/ODM case manufacturing. 12h quote, 30-day delivery.